the 496 BBC is basically the BBC version of the 350 SBC, being stroked to 383,
in a SBC, you bore the block .030 and stroke the standard 350 from 3.48" to 3.75"
on the BBC you bore the 427n or 454 block .060 and stroke it an additional ...1/4 or 1/2 inch from the stock 427s 3.76" 0r 454s 4.0" stroke, standard bore on the 454 is 4.25 and if you just stroke the standard bore block you get a 489 displacement
the 496 (4.310 bore)(.060 over) and 4.25 stroke (4.25 stroker)vs the stock 4.0" will drop into some blocks but most require minor clearance work.
btw the 6.385" rod combo with the larger counterweights is prefered over the stock 6.135" rod version due to ballance and clearancing issues, counterweights clearing the piston skirts, and having less machine work to ballance in many cases, don,t forget the oil pan usually needs to be checked or modified for clearance, with some rods
http://kb-silvolite.com/forged.php?action=search&mfg=CHEVY&EngSize=489&RodLen=6.385
http://www.ohiocrank.com/chevy_rotating.html
http://www.scatcrankshafts.com/PDFs/ScatCrank07.pdf
http://www.adperformance.com/index.php?main_page=index&cPath=71_232
http://chevy.off-road.com/chevy/article/articleDetail.jsp?id=275108
http://airflowresearch.com/articles/article073/A-P1.htm
http://www.carcraft.com/techarticles/116_0703_big_block_chevy_engine_build/index.html
in a SBC, you bore the block .030 and stroke the standard 350 from 3.48" to 3.75"
on the BBC you bore the 427n or 454 block .060 and stroke it an additional ...1/4 or 1/2 inch from the stock 427s 3.76" 0r 454s 4.0" stroke, standard bore on the 454 is 4.25 and if you just stroke the standard bore block you get a 489 displacement
the 496 (4.310 bore)(.060 over) and 4.25 stroke (4.25 stroker)vs the stock 4.0" will drop into some blocks but most require minor clearance work.
btw the 6.385" rod combo with the larger counterweights is prefered over the stock 6.135" rod version due to ballance and clearancing issues, counterweights clearing the piston skirts, and having less machine work to ballance in many cases, don,t forget the oil pan usually needs to be checked or modified for clearance, with some rods
http://kb-silvolite.com/forged.php?action=search&mfg=CHEVY&EngSize=489&RodLen=6.385
http://www.ohiocrank.com/chevy_rotating.html
http://www.scatcrankshafts.com/PDFs/ScatCrank07.pdf
http://www.adperformance.com/index.php?main_page=index&cPath=71_232
http://chevy.off-road.com/chevy/article/articleDetail.jsp?id=275108
http://airflowresearch.com/articles/article073/A-P1.htm
http://www.carcraft.com/techarticles/116_0703_big_block_chevy_engine_build/index.html