Editing Identifying Chevy engines (section)
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==Factory hydraulic roller SBC block ID== Hydraulic roller valve trains were used beginning in 1986. During this period, there were both roller and flat tappet (non roller) equipped engines available. Some blocks came completely machined for a mechanical fuel pump. Others have either partial or no machining of the block to use a mechanical F/P. It has been said that most or all of the c/n 638 blocks are ready to use a mechanical pump. In EFI applications, these engines will have a block off plate covering the mechanical pump area. 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. Blocks 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: *10243880 (common casting number of a 5.7L Vortec engine) *14011148 *14088526 *14093638 Some of the 1986-up Chevy small block engines used flat tappet (i.e. non-roller) cams. 350 cid/5.7L flat tappet blocks are casting numbers: *10054727 *14079287 *14088548 *14101148 These flat tappet blocks '''''may''''' have the provisions for a roller cam (i.e. 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. In any event, these blocks originally had a flat tappet cam and non-roller lifters, no spider, and no cam thrust plate. These blocks are fine if you don't care about the roller cam. {{!}} There is a flat tappet block and a roller block with casting numbers that ''both'' end in '''148'''. '''14101148''' is a flat tappet truck block, '''14011148''' is a roller provisioned block. ===Vortec block cylinders=== The newer Vortec era blocks (1996-up) have a slightly shorter bore at the bottom, nearest the cam tunnel, as shown below left. 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. [[File:SBC BORE DEPTH 002.jpg|left]]<br style="clear:both"/>
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