Some 396 blocks will take an overbore to 4.250". While not 100%, a Mark IV BBC engine can sometimes be ID'd for being a 2- or 4-bolt bottom end by looking above the filter mount: BBC external cues for 2- or 4-bolt bottom end This isn't a problem in most cases, but if a stroker crank is being considered, this should be looked into to be sure there'll be no issues due to the lack of piston support at BDC.īBC 454 balancer with inner ring scallopedĪ BBC block may have bores notched to clear the intake valves. The newer Vortec era blocks (1996-up) have a slightly shorter bore at the bottom, nearest the cam tunnel, as shown below left. 14101148 is a flat tappet truck block, 14011148 is a roller provisioned block. There is a flat tappet block and a roller block with casting numbers that both end in 148. These blocks are fine if you don't care about the roller cam. In any event, these blocks originally had a flat tappet cam and non-roller lifters, no spider, and no cam thrust plate. bosses present and drilled/tapped for the spider and for the cam plate, etc.), but also may not be equipped with the drilled and threaded bosses needed to use a factory roller valve train. These flat tappet blocks may have the provisions for a roller cam (i.e. 350 cid/5.7L flat tappet blocks are casting numbers: ![]() Some of the 1986-up Chevy small block engines used flat tappet (i.e. 10243880 (common casting number of a 5.7L Vortec engine).Casting number 880 blocks have been seen both with and without mechanical pump provisions, and casting number 148 is mostly without the mechanical pump provision.īlocks with a 4" nominal bore diameter (as used on the 350/5.7L SBC engines) that are equipped to use the factory hydraulic roller valve train, are casting numbers: In EFI applications, these engines will have a block off plate covering the mechanical pump area. It has been said that most or all of the c/n 638 blocks are ready to use a mechanical pump. Others have either partial or no machining of the block to use a mechanical F/P. Some blocks came completely machined for a mechanical fuel pump. During this period, there were both roller and flat tappet (non roller) equipped engines available. Hydraulic roller valve trains were used beginning in 1986. The last number is the last digit of the year. The next number or two numbers will be the day of the month. The date code generally has a letter followed by two or three numbers. The date code is most often found back by where the transmission bolts to the engine block, on the top side of the block. Suffix and VIN codes, including many truck codes (from ).Blocks from the '60s through the mid '70s use the bottom pad.īeginning about 1969 the suffix code became (mostly) three characters instead of one or two. Mid '70s-up blocks use the short, fat pad (top example in the picture below). Small block Chevy engines used different size pads for the engine suffix/partial VIN. There will sometimes be two lines of numbers and letters, later engines had just one line of numbers and letters. Suffix codes are stamped into a small boss on the front passenger side of the block where the head and block meet. Big Block Chevy Engine Parts Identification from.Big Block Chevy V-8 Casting Numbers by Mortec.Chevelle-specific block casting number info.Chevy BB and SB casting number "go-to" site from.Small-Block Chevy V8 Casting numbers by Mortec.Usually the last three numbers aren't repeated, but there are cases like the SBC head c/n 462 that- for some unknown reason- was reused 5 times! Fortunately this is rare. block c/n 10243880 would be called an "880" block. ![]() It is common practice to use just the last three numbers of the c/n when dealing with casting numbers, i.e. The date code will usually be found in the same area, sometimes on the opposite side from the casting number, but not always. The Chevy V8 block casting number is generally atop the transmission mounting area of the block. Chevy engine casting numbers has additional info including links to several sites that have casting numbers broken down to application, etc. One of the easiest way to identify a Chevrolet engine is by the casting number (c/n) that is cast into the castings (not stamped). this means Corvette.Locations of Chevy V8 block ID numbers and codes basically this means "it's used in everything", whereas if it simply states "Y". If you're looking at the casting # information and it mentions 3970010 "A/F/X/Y/B". If you're looking at the engine code - this is already known. Quickly, A = Chevelle, F = Camaro, X = Nova. Home name history competition hk ht hg hq hj hx hz vx identification models links Small Block Chevy Suffix Codes: CE - CMJ
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