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I think the consensis is that the term "SBC" is of the original design of the engine that started back in 1955 and went through either 1998 or 1999... What I found interesting is the Gen II is referred to on the Vortec engines of the 96-98 era, but for some reason there was some major changes in the block of the 1987 engine, with the single piece rear main seal than the 96 block... There was some head design upgrades, but AFAIK, or until proven wrong, I thought the block itself on a Vortec was essentially the same as the 87-95...
I do know from talking to truck owners, that a 1996 5.0L will outperform a 1995 5.7L...
no vortec headed truck motors were gen 1, just a different intake for the heads for the 96=99 motors. LT1 was gen 2 due to reversed coolant flow and opti crap ignition.
__________________ 2011 chicago world of wheels placed in super street class
Best Engine '11 Thirdgenfest
Best Modified Camaro Thirdgenfest '05, '07, '11 Second place Camaro Modified '06, '08, & '10
MFBA March 2008 Featured Calendar Vehicle