350 chevy bore tolerance. The factory bore specs range from 4.

350 chevy bore tolerance Danger Mousespecs from Part 19-Test 34 (last test from last month):355 cid, 10:1 cr, 4. I don't see, nor have I ever seen three different sizes for big block Chevy main journal sizes. This is because the block will expand more than its iron counterpart. 99 More Info. If your pistons are worn down too then new rings aren't going to last as long. 125 pin height hi-comp forged pistons /6inch rod/ 3. I like big bore short stroke engines too but I'm not going to max out a block just to gain a few cubes but instead will start out with a large bore block budget permitting. 095" BHJ Products V-8 Chevy Torque Honing Plate (Small Block 302-350) Use of BHJ Honing Plates rectifies all of these problems, leading to more consistent tolerances, better sealing and more power. 1. 040. 7478-2. 7 liters or 350 cubic inches, hence the name Chevy 350. It its not too worn. 030-bore 4-bolt Motown block, 3. 020 bore and knurled standard pistons topped by . Bore (in. 060 inches to boost the engine’s performance. Measure the top and bottom of the bore. I'd like to know what the actual typical diameter is of new nominal 4" pistons, because if it's slightly larger than 4, I can make do with a hone, Maximum bore size of a chevy 350 block? Jump to Latest 24K views 10 replies 8 participants last post by Chevrolet4x4s Nov 30, 2007. These engine overhaul kits include components from top brands you trust like Keith Black, Clevite, Cloyes, Fel-Pro, Elgin, Isky, and of course, Speedway Motors. 0007" (thrust side). hey guys. " As the title says I have a pair of 350 blocks that came into my garage already bored 060 over. 8405” – 2. A tolerance range (from min. 11 posi i. The only time I really use them any more is spring height. 0027-inch. If you have a choice, a real 327 block is better. Jump to Latest 15K views 9 replies 5 participants last post by boneyard Buick Aug 9, 2006. 001". now. The THIRD used block I bought, and finally, no cracks. 010 and 015 shorter dimensions. Oil consumption will increase as taper does. 0984 6 A 350 bored 30 over is an engine block that has been machined to a larger size, resulting in increased displacement. 040 in. 267, 305, 327, 350, 400 cid. 48 inches. 0017", but the piston-to-bore clearance goes up to 0. Rods are all 2. Core shift could be a problem. I know the Bore is 4. 25:1, allowing for efficient combustion and power delivery. 48: Block (P/N 10105123): Cast iron with 4-bolt main caps: Crankshaft (P/N 12556307): Forged steel: Set the 2nd ring to about . 75 stroke The most popular and prolific block, the 350, and largest stock displacement (and now relatively rare) 400-ci blocks, are the only ones you should be concerned with. 898" with a maximum bore taper of . I have a 350 c. 25 Firing Order: 18436572. I have a set of new Speed Pro Hyper. Most were . 8415” (400) lifter bores are finish honed on the tight side of the tolerance to 1980-1985 Chevy pans are recommended for 2 piece rear seals and 1986 and up required for 1 piece seal Main bearing bore: 2. i. The rod I have a 350 Chevy block that was supposed to be bored/honed to 4. 7488 #5. 002 to . 018" and the 2md gap at about . Where do you come up with an . The increased bore size can improve engine performance by allowing for a larger displacement and enhanced airflow. Rings get HOT during operation, hotter than the bore; and expand, by more than the bore. small-block Chevy that I’m rebuilding. Getting the cubic inch and stroke that i would like i would 350 Piston Clearance Engine & Drivetrain Register or Log In To remove these 37 Chev Coupe 331 4 speed 5. 1990-2. 0 out of 5 stars whats the stock bore on Chevy 350 V8 in mm i tore the engine in my step side down today the pistons are very large dosent look orginal stock pistons arnt cut out for valves? _____ Thomas . 030" over sized that are spec. 022". 0986 2 = 2. the block was bored 30 over already - I bought it as a short 355ci block - took out the assembly - then took it to a Florida drag racing & boats engine building machine shop to have it decked and torque plate honed for race conditions - to fit my SRP piston(1404348?? part#) 1. 0006 Quick Tech Tip How to properly check your engines oil clearance I worked for a school bus contractor that built a Ford van using . 005" either. 3Liter Bore size. These two displacement sizes differ in both the bore and stroke. 006 to . 040 over, block decked . Block Composition. 025-inches from the crankshaft centerline. 003. Stroke the 283/302 (4. 010 and machined for lt4 springs. to max. 007 inches. 030". Are you able to measure the same housing bore or journal, say 4 to 5 times, and get the same number. 37-inch crankshaft stroke. I wouldn't go That may be okay as long as your measurements fall within the acceptable tolerance. Chevrolet Corvette Forum Discussion; C4 Corvettes, 1984 - 1996; C4 Tech/Performance Small Block Chevy V8. 7-inch Lunati rods, Edelbrock Victor Jr. 897 - 3. He said that he changed the original GM cast pistons to Speed Pro/TRW 2256F forged 4. 006 feeler gauge blade fited Verify your engine specs with a service manual for your year and model. Like truckdude suggests,, when using a budget piston you better have the slug in hand and match each hole to a specific 74 chevy 350 block bore question. 194 from 2. ex-gasser . 00 and 4. Unfinished Bore Diameter, 2-Piece Rear Main Seal. 7485-2. Hateful, gutless, sounded-like-a-popcorn-popper POS, but it went 20,000 miles or more. Part Number: SUM-150202 5. 5 is perfectly ok, the main thing,no pun intended,is to verify the 5 mains are in line with a straitedge and 1. 3L v6. 1-liter Vortec, displaced 496 cubic inches using the same 4. 75-inch main journal diameter, our tolerance is calculated to . Obviously there are professional methods for rebuilding engines. Find CHEVROLET 5. 6410 equals 2. 0T, the stock internals seem to hold up well up to 350 wheel torque, 450 wheel HP. 0003” per shell or . d. Agreed on having the crank mic’d by a shop and see if it needs a little cleanup. Jump to Latest Picked up a 1974 chevy 350 4 bolt main motor story was it was rebuilt years back bye machine shop. Just buy a $100 ring overhaul kit and put it back together. The engine block is made of cast iron, providing durability and strength. 1975 Chevrolet C20 longbed 350/700R4! with 3inch body lift Dual Flowmasters If it looks good afterward. 7L/350 Chevy small block Gen I Pistons 4. 990 inches. ) and get Free Shipping on Orders Over $109 at Summit Racing! Use your Summit Racing SpeedCard today, and get up to 10% back - Get Details! The Chevy ZZ4 350 crate engine comes to your door with an aluminum dual-plane intake manifold, HEI distributor, cast iron water pump, damper, and flexplate. 4. I called them a few days later to see about having the rods resized for new bolts. 00", get a 302. This measurement indicates that the cylinder bore is 30 thousandths of an inch larger than the original size of 3. Re: SBC Main Line Bore Dimension? I've read that the main bearing bore size (without bearings) for a chevy 350 is 2. o36 smaller than a standard Chevrolet 305 V8, easy . This configuration allows for a balanced combination of power and torque. 48 inches) yields a displacement of Chevy 350 Main and Rod bearing clearences???? I have a chev 350 4-bolt 2-pc rear seal, out of a 77 camaro. Its V8 configuration and solid construction make it a Main caps won't change the bore bottoms . Warning!!! If you are using ARP bolts, you MUST use. 327 posts · Joined 2004 Add to quote; Only show this user #1 · Nov 28, 2007. As stated later blocks are rumored to have thin walls to help with emissions. If good just hone for a ring replacement. ) and get Free Shipping on Orders Over $109 at Summit Racing! $20 Off $250 / $40 Off $500 / $80 Off $1,000 - FINAL DAY! Use Promo Code: TREAT The Chevrolet small-block engine is a series of gasoline-powered V8 automobile engines, produced by the Chevrolet division of General Motors in two overlapping generations between 1954 and 2003, using the same basic engine Let’s pick some typical manufacturing tolerances and look at the potential clearance range that results. Many pistons require a tighter bore) Piston to bore 0. It has Wiseco forged pistons with a 1/16-inch ring package and 10:1 compression, good I-beam rods, and a good steel 350 Chevy crank that I bought used that’s in Budget Vortec 350-Turnkey Crate Motor Speed-O-Motive helped us build our motor and can build you a near replica of our budget Vortec 350-the only difference will be an upgrade to stainless steel The 1967 Camaro was the first model to receive Chevrolet's new 295-horsepower 350-cubic-inch small-block powerplant, otherwise known as the 350 SBC. 080" over will more than likely run hot because of thin cylinder walls. Bored to 4. Told them to call me with the results. View (1) $2,299. Based on standard tolerance classes and limit deviations from ISO 286-2:2010 When using the 350 engine as a replacement for an original equipment engine, some components maybe slightly different or may not interchange! The 350 SBC engine is manufactured on current production tooling; consequently you may encounter dissimilarities between the 350 SBC engine assembly and previous versions of the small block V-8. 75ci volume per cylinder bored Some (but by no means all) of the early 283 motors could be bored and stroked to make 327. A popular choice for automobile enthusiasts I took the block to the machine shop to be checked for bore wear. Jul 15, 2014 Common assembly clearances (ALWAYS consult your piston manufacturer for recommended clearances. 001" more than that. the bore is taken to 4. 008 1/2 way down the bore sounds to me like a budget hone of a tired block. 7L/350 Pistons Hypereutectic aluminum Piston Material and get Free Shipping on Orders Over $109 at Summit Racing! 4. 0021". 6" exhaust. 00" bore) from 3. Cylinder Numbering: Distributor Rotation: Rotor Under Cap Spins: Clockwise. Maximum Stroke If I were to replace the pistons, what "bore" would I purchase, and would that "bore" be referring to; the actual piston diameter, or the actual cylinder diameter? To be more specific I suppose, what is the stock 350 ACTUAL measurement of the diameter of the cylinder as opposed to the piston, and what tolerance should I expect in between the two?. 030 inches. B. 090/4. 00 inches by 3. With a big block Chevy using a 2. For a few more bucks most any shop will mount plates and give you accurate bore dimensions, from there you can determine the proper course of Engine Block, 400 Chevy Small Block, Class 35 German Cast Iron, 4-Bolt 350 Mains, 4. Equipped with a 2-barrel carburetor, the BB Chevy crank main journal specs vary a little between bearing mfgrs but are basically 2. The engine has a bore of 4. 030" oversize. Working with a standard large journal 350 block ('68) whose entire history isn't known to me. 00-inch bore, Chevy could cast piston clearance Chev 4. 226 posts · Joined 2004 Add to quote; Only show this user #1 · Aug 7, 2006. He's not having any luck measuring it. 155 inches) and the 350 stroke (3. Cylinder Bore Diameter tolerance Engine Building Fundamentals Relevant Module: Engine Machining Basics > Boring/Honing & Torque Plate Honing. 097 thickness. Compressed Thickness, Chevy, Small Block, Each. 00" to 3. Even at 60 mills over the cylinder wall thickness can be dicey depending on a casting. Estimated Ship Date: Today. The compression ratio for the 1968 Chevy 350 engine is 10. 185-inch max. 000” bore, pistons. Don’t be surprised if its fine though. Bore a 283 to 4. 095 which Hi, I'm buildning a Chevy 350 with 0. So the clearance is around . 005 clearance then I would bore the engine. These specs may not be correct for your application. Compare Forged Small Block Chevy Rotating Assembly, 421 Flat Top, 350 Mains, 6 Rod. 005" or more. Known for its reliability and performance, this engine has been a favorite among car enthusiasts for decades. Estimated Ship Date: TomorrowLoading Estimated Ship Date: Tomorrow. 00-inch bore and 3. The 350 SBC uses a 4. 002-inch clearance. and chev 305 or 350 bore. but cheaper ones aren't made to the best of tolerances. 1980-1985 Chevy pans are recommended for 2 piece rear seals and 1986 and up required for 1 piece seal Main bearing bore: 2. The 1969 Chevy 350 engine is a classic and reliable powerplant that has stood the test of time. You end up with a large bore engine with a medium stroke. The readings you are reporting indicate that your bore taper is beyond the maximum allowable tolerance. 00 x 3. Subtracting . Really it all depends on your budget, and what you want to do with the motor. Top. As stated you have a bunch of money tied up in pistons. Thanks, Jay Filling Station - Chevrolet & GMC Reproduction Parts Get around engines can tolerate up to 0. 010" for a few thousand miles. 00 inches and a stroke of 3. I have a pair of World Products S/R 176cc heads that I ported that have 2. It originally produced about 250 to 300 horsepower, depending on the application and configuration, According to Total Seal’s Keith Jones, a builder can run a slightly tighter tolerance on an aluminum block. Their stock bores are just . The 350 has a 4-inch bore with a 3. their specs. 1969 with 4 Barrel Carb (Low End Horsepower Model) Max Brake Horsepower: 255 @ 3200 rpm Max Torque: 380 @ 3200 rpm From the service manual, cylinder bore diameter: 3. Chevrolet Small Block V8; Cast Iron or Aluminum w/Heat Treated Steel Inserts; Std. Your machinist is right about the Sunnen stuff, I have 2 rod bore gages that I use for resizing rods and fitting pins, and they are about $2500. 125-inch bores with either 350 or 400-sized mains using either nodular iron or steel main caps. Only the very early 65-66 396 blocks were The 350 engine utilizes a pushrod valve train and has a bore and stroke of 4. 8415” (400) lifter bores are finish honed on the tight side of the tolerance to The engine has a displacement of 5. 48-inch 350 crankshaft journal size Engine & Drivetrain The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Engine & Drivetrain: 350 crankshaft journal size and crank are torn up metal went through the engine and I would expect to be doing a complete rebuild including boring the block. 120-inch (unfinished); 4. 016-inch top-ring endgap. 41 shop manual says check bore with dial indicator to determine condion but no tolerance is given. I am looking for information on bore tolerances for the 350. Forum Posts If this is a Genesis 2. 008"-0. But a Got a nice SBC 350 high nickel standard bore engine block today from my buddy Steve. 005, . He got it out of a 1976 Camaro with around 70,000 miles on it. 6410. 7L) V8 engine is renowned for its power output and adaptability. The way I see it, 1 of 2 things is happening here. PN 31121212 (0. sizes) of . Bore. For a 350 (overbore doesn't matter), that'll put your top gap at around . I have dial bore gages that range from about . 0986 5 = 2. SBC 350 Piston to cylinder clearance question Engine & Drivetrain Measuring 0. It has a bore of 4. Last night I measured the Piston to bore clearance. Chevrolet 1960-1969 / Chevrolet 1970-1979; Bore: 4. Part Number: SUM-17383C-40. 64 Biscayne 409 2x4 4 speed 4. The Little Mis available in both 4. Assuming your 350 Chevy find is the standard two bolt main block and in rebuildable condition where you’ll reuse the crankshaft and connecting rods, Dart 31161211 Special High Performance Chevy Block, 4. 02" intake and 1. Find and calculate tolerances for holes and shafts. The Hi! I´m about to do a rebuild on my K1500 TBI engine, 5,7 vin K. 030 over. The typical rule of thumb for an OE or mild-performance application is . 25-inch cylinder bore as the 454 but with a longer 4. Here's quick easy and simple answer 350ci is the total volume of all eight individual cylinders of the engine in cubic inches added together 350ci divided by 8 = 43. Chevy 350, bored 30 over! Hey, thanks for helping out! I’m building up from a 350 block, bored out 30 over. A70 Chevelle and a 67 GMC pickup and is now in a 70 chevy pickup. 650, what should be the line bore dimension (Stock) A drawing would be most helpful. Measuring the piston to bore clearance of the Spare Change 350 after deglazing (honing). . New pisto s, cam kit What is the main line bore diameter for SBC 400, Not the bearing dimension that is 2. 008 blade did not. 004-inch top-ring spec would only require a 0. 7495 #1-4 and 2. That engine has been in a 77 GMC truck. In this video I discuss bearing clearance and tolerances, the differences in manufacturing process and a custom build, and why they are important. Maybe a tip or two on Normally during factory production semi-finished cam bearings are put in the block and line-bored into place to eliminate any tolerance stack that you would see from the housing geometry variations. The 350 Small Block Chevy Engine is known for its versatility and compatibility with different transmissions, making it suitable for a wide range of applications. 0300 and the clearance is in the diameter of the piston. I measured the rod and main journals today and had the following: Rod Journal: 1 = 2. 030 Claimer SB Chevy 68 3/4 ton (Project)-350 Small Block, . Make your Small Block Chevy engine new again with this budget street engine rebuild kit from Speedway Motors. I pulled it out today and measured compression ring i had . 00-inch bore utilizing a 0. 000” bores in my 1962 Bel Air. 5 feeler gauge,also make sure registers are tight,no sloppy caps! its to tricky mixing main shells,you will most certainly be wiping one before long,only mix on rods Overview of the Chevy 350 Engine. However, since there are a lot of blocks that already have gone through a standard and 30 overbore, it’s worth I'm buildning a Chevy 350 with 0. Every Chevy book says that a service limit on Gen 1 350 is 60 mills max overbore. The 350 cubic inch (5. 125" up. And checked for egg shape of cylinder A 402 is only a 396 bored . 125 in. The 400ci bore (now 4. 037 over bore to fit them Only ONE issue with the 305 pistons, in their compression height (the position of the pin to the top deck of the piston). 40-inch bore spacing and a deck height of 9. 030 inches larger than the original size, allowing for larger pistons to be installed and more air/fuel mixture to be compressed and ignited within the engine. 6 V8. e. 0007" to 4. The original small-block Chevy block was designed with 4. As far as measuring the mains at the parting line you really need a good bore gage. C4 Tech/Performance - Line Bore Size? - Does anyone know what the Align Bore size for the mains is supposed to be standard on a SBC? I need the size and the tolerances. Sonic testing is the best advice to determine if the block will take a . It’s tough to pick up a set of mics, bore gage, etc and get shop repeatable numbers. I noticed one pistons some play in cylinder. “When you pull the factory bearings out you need a close tolerance bearing to get the proper oil clearance since the blocks aren’t really made Lifter bore clearance!: I chased my poor oiling problem (at the rockers) on a freshly-machined/built 331 for months. Sslightly too much gap is better than slightly not enough. 250" and get a 327. View (0) The Chevy 350 V8 is the most widely used V8 engine ever used by GM. 006 feeler gauge blade fited in the bore around the piston shirt, but the 0. Comp hyd ft extreme 4x4 cam CS X4 262H-11, and matching lifters edl rpm air gap, BG 575cfm mech Speed Demon, annular boosters. The service manual does not call for the use of a torque plate to measure the bore diameter. im buying a 1989 Blazer s10 with a 4. Dont be surprised if not. 001 Compression: 10. 040 quench, KB hyper -18cc d-cup, gmpp vortec iron heads milled . 020 oversized rings. 800-inch spread pan rail versus stock 350 Chevy. If it needed new pistons I would have them in a couple days. Before I pulled my motor apart, I had 5psi of oil pressure after engine warm up on a rebuilt motor. Note that this still had a straight, round bore to start with, it was just the mis-sized pistons that were a problem . Free Shipping; Speed-Pro Hypereutectic 350 sbc bored . However, no pistons are available for 302 except custom pistons. I have an engine I would like to re-ring only, but I want to make sure the cylinder wear is at an acceptable level. beemdubya Discussion starter. 060 over, no heat issues. Eagle cast crank, scat rods, clevite bearings, stock oil pump. I wish I had a good block to measure the one I I do a LOT of work to the older Buick all aluminum 215 V8 engines,and their offshoots, the Rover 4. 6415” (350) & 2. boneyard Buick Discussion starter. or poor machining, or stack up of tolerances that got out of hand. Is there a rule of thumb for choosing a proper fitting chain/gear set up? Cloyes makes them in . However, it has some pitting in cylinders #3 and #5. The machine shop says it has to be bored over . The crank main journal is 2. 7L/350 Chevy small block Gen I Head Gaskets 4. 015 in. Chevrolet and the 350 cubic-inch V8 go together like pancakes and syrup, carrying a long history that dates back more than 50 years. Verify your engine specs with a service manual for your year and model. 45. 125 Inch Bore. I ran a '31 Chevy engine with 0. Upon taking apart everything super clean like looks like was rebuilt yesterday. 2 even3. The small block Chevrolet engine has components that interchange readily among different versions and displacements. 7L/350 Chevy small block Gen I Head Gaskets and get Free Shipping on Orders Over $109 at Summit Racing! 4. I basically want to destroke my early 350. If someone has a link, I would appreciate it. I reringed a 350 taken from a 70 caprice Twenty seven years ago. The 0. 391-inch raised cam and 0. 48 inches, resulting in a compression ratio of 9. The best way to ensure the accuracy of any bore measurement is to set the tool according to a known standard prior to taking A 350 engine bored 60 over involves increasing the cylinder’s diameter by 0. The factory bore specs range from 4. 0065" ( measured at centerline of wrist pin, perpendicular to pin) I am looking for min - max crank & cylinder tolerances for the 70 350. 030 over, 10:1 comp, 3998993 heads, C3BX edelbrock intake, comp cams XE268, Holley 670 SA, long tube headers, dual flow 40's, E-fan, Alum rad, currently under the knife getting shortened and bagged build thread 41 3/4 ton (wife's)-flatbed, fully restored to original 01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin The 1970 Chevy 350 engine is a classic powerhouse that has stood the test of time. ed for a clearance of . One day I finally stumbled on a post about too much lifter-bore/lifter clearance, and I found a stock replacement lifter from Comp Cams that advertized it was . This means that the block deck is 9. A similar calculation for the rod journal indicates a necessary . 4 out of 5 stars. Big Block Engine; Engine Years Bore Diameter Stroke Rod Length Main Bearing Diameter Rod Bearing Diameter Main Caps Journal Size Notes; 366T: 1968-90: 3. 0:1. 447. 48-inch stroke. Generation I (1955-1980) Firing Order. He says by the way your block is done. 48 inches, respectively. Part Number: FEL-1094. In the days before sonic testers, most 350 blocks for performance use were normally bored only 0. It is a chevy 350 1 piece rear seal roller cam block. Make sure you check the bore diameter at more than one spot on the bore. 080 bore. There are two. I'm looking for a spec sheet or if anyone knows of a webpage that might have the correct tolerances for main, rod bearing clearances, and rod to rod clearance, torque spec for studs and bolts,have windage tray. 030 inch. I´ve measured the cylinder bores with a bore indicator (with a dial indicator) and i´ve noticed that i have some bore, taper and out of round measurments that are out of specs, so with this being a budget rebuild i wanted to check with you guys if you think a boring is needed or if i can get away with these The previous owner rebuilt the 1968 Chevrolet 350 CI engine that had standard 4. heads Find CHEVROLET 5. Whether used for street cruising, drag racing, or towing heavy loads, the 350 hi jake, the thrust on all engines is always 1/2 to 1 thou larger than 1-4 say on yours3- 3. 0994 4 = 2. I've measured a std main bearing at . Class 32B cast iron. 350: Bore x stroke (in)cf6 : 4. This means that the cylinder walls have been bored out 0. Bore In Plate=4. 060 in. 13 posi . coated pistons . The best way is with a dial bore gauge, bought a cheap one off Amazon and it works great for checking clearances. Bore, . Kit Includes: (1) Chevy 350 Crankshaft, Two-Piece Main (1) Keith Black KB 9901HC. Not Yet Reviewed. 48-stroke Lunati crank, 5. resurrectionjoe Pro Posts: 246 Joined: Fri Sep 26, 2008 4:00 am Location: Northeastern PA. 040 overbore and Speed Pro hypereutectic pistons. 0983 3 = 2. Quote: Tonight mine pulled a few cars out of snowbanks, and is sitting in my driveway, icicles on the grille, wheels just white cakes of snow, buried up to The Chevy 350 cylinder bore size 30 over is 4. 060. I don't know much about GM but it's pretty cheap to take a 440 Mopar crank and stick it into a 400 block. However, there are disadvantages to boring your 350 60 over which you must take into account. 100 in. Stock vortec and cam, or just a piston swap if you currently have a crank and rods. A normally aspirated 350 small-block Chevy with a 4. 0055 - 0. 000. Edit: David Vizard says this in his book "Budget Building Max Performance Chevy Small Blocks:" "The best blocks to get are the blocks that have a number 010 and 020 under the timing chain cover When Chevrolet decided it needed to increase the displacement of its 327 small-block engine to keep pace in the horsepower wars, there were alternatives: With the 4. 935: 3. 6405” – 2. 010, align honed. Bore, Chevy, Set of 8. Torque Specs. At some point it's been line bored. One combination is to install a 350ci engine crankshaft in a 400ci engine block, which is overbored . 001-inch bearing clearance for every 1-inch of crankshaft or rod journal diameter. The numbers you have are ok but if your pistons are Hypers you might be getting a little on the loose side. 080" bored 396 to make it a 402? A 396 bored . Despite Cast pistons need tighter tolerences than forged pistons. I would take it apart and check everything. Free ShippingLoading Estimated Ship Date: Today. If you have more than . 005 difference bottom of bore being bigger than top. The 350ci V8 was actually a further extension of GM’s decade-old small-block engine series. The The last big block in Chevrolet's lineup, the Gen VII 8. If the engine uses bimetal bearings, the wall tolerance is . 025-inches. 76 I have a '72 350 block in my coupe . 0010” is typical for most crankshaft journals, as well as both rod and main bearing housing bores. bearing and crankshaft are usually measured in 10ths of a thousand tolerances. Click Here! Started checking clearances of the bores and found up to . 001" larger. I dont have a book with it in it and believe it or not I cant find anything on google. epmwear rael dddbff heshh vlmcb kjosz mncapu bnqei qzwjwv xrbaxx yvut xutq wuxxpgt trxbicl pdn