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Tim H · 06-25-2008, 03:57 PM

I believe that the one pc. rear main seal debutted back in 1988. There were truck and marine engines that were one pc. with flat tappet cams for years... something like 1988 to about 1995 or '96. The car engines went to roller lifters back in '88 or '89. As far as the angle on the intake bolts , pretty sure that came about the same time as the 1pc rear and center bolt valve covers also 1988 ?.

06-25-2008, 03:57 PM	#2
Tim H VIP Member Join Date: Jan 2007 Posts: 1,041 Likes: 1,071 Liked 481 Times in 158 Posts	Re: SBChevy Engine Types I believe that the one pc. rear main seal debutted back in 1988. There were truck and marine engines that were one pc. with flat tappet cams for years... something like 1988 to about 1995 or '96. The car engines went to roller lifters back in '88 or '89. As far as the angle on the intake bolts , pretty sure that came about the same time as the 1pc rear and center bolt valve covers also 1988 ?.