280z4me2 Posted September 6, 2009 Share Posted September 6, 2009 . The 350 came from a 1998 Chevy 3500 Van, unsure of the other. Cant find anything telling me if the 350 is a 2 or 4 bolt. Any ideas? Quote Link to comment Share on other sites More sharing options...
MaliceIntent Posted September 6, 2009 Share Posted September 6, 2009 I would bet money that it is an L31-R (4 bolt main) same as this: http://www.summitracing.com/parts/NAL-12530283/ 4 bolt mains are used primarily used in heavy duty applications, and a 3500 im sure is considered to be heavy duty. but here is the two bolt main sister motor: http://www.summitracing.com/search/?keyword=12530282/ -MIKE Quote Link to comment Share on other sites More sharing options...
280z4me2 Posted September 7, 2009 Author Share Posted September 7, 2009 I have read quite a few parts descriptions that say they are for 350's up to 1994. This is a 1998. Im sure everything is a bolt on swap but why are the 1998 350s rarely mentioned? Quote Link to comment Share on other sites More sharing options...
Scarab 155 Posted September 7, 2009 Share Posted September 7, 2009 You can figure out the engine by looking at the casting number and then looking at the Mortec site . Follow this link and instructions http://www.mortec.com/location.htm Quote Link to comment Share on other sites More sharing options...
MaliceIntent Posted September 7, 2009 Share Posted September 7, 2009 the L31, which is a "Vortec 350" or "GEN1+" or "GEN1e" was put in 1996-2002 Fullsize Chevy/GMC Vans. The block is identical to '87 and up GEN1 blocks, it has a roller cam, and Vortec heads. Because of the Vortec heads, a Vortec style intake manifold is required for carb conversion. I have read quite a few parts descriptions that say they are for 350's up to 1994. This is a 1998. Im sure everything is a bolt on swap but why are the 1998 350s rarely mentioned? What parts are you looking at? Quote Link to comment Share on other sites More sharing options...
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