Members Al F. Posted September 30, 2018 Members Share Posted September 30, 2018 Rule reference 6.14 Recommended Revised Wording GM 5.3L LS Engine Option GM cars may substitute the engine long block assembly with the Gen III 5.3L LS series LM7, L59, LM4, and L33 long block assembly from 1999- 2007 GM trucks. The intake, exhaust manifolds, and all external accessories and electronics from the Late GM 5.7L LS cars must be retained for 4th gen cars. The 3rd gen cars may use the truck accessories. The LS1 camshaft may be used in the 5.3L engine. Reasoning for change: Will decrease series cost because truck accessories are dirt cheap if not free and they fit better than the 4th gen accessories into a 3rd gen. Will provide more clarity because the L33 came in 05-06 trucks and a scant few 07 classic body style trucks. While the L33 did come with more compression, more cam, and better heads than the other 5.3s it is still less motor than the 5.7 LS1 and is still a cheaper alternative. The LS1 came with at least 3 different cams, so chopping the verbiage to allowing the LS1 cam in general seemed most fitting. Arguably the best cam for a 5.3 LS in CMC would be the late cam which is also found in 6.0 LQ4/LQ9 engines so they're plentiful and cheap. Quote Link to comment Share on other sites More sharing options...
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