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  1. #1

    Default 5.3/LS15.7 comparability???

    I'm curious about the compatabilty of the two engines. I will probably be doing this backward from most but my purpose is not necessarily to gain hp for racing. I am in the market for a new truck/suv but, everything in my price range has 160,000+ miles.
    I found a good deal on a ls1 long block from a 2001 Camaro SS. It only has 40k on it and I know thos engine was good to the owner. He did 11.4 in the 1/4mile with just bolt ons.

    I know the LS style intake will fit on the 5.3 truck engine if you use the fbody accessories but, thats not where I'm going.

    My question like I said may be backward from the norm. I was wondering if I could just swap the truck accessories & intake to the ls1 long block and call it a day. Of course I realize some tuning will be involved.
    2003 Tahoe 4x4 blacked out with 5.3L and small lift.
    1995 K2500 Single cab 3" body lift...on its way to the grave soon.

  2. #2


    It depends on which year 5.3 you are talking about. If it's the earlier Gen III 5.3 then the intake and accessories should bolt on to the LS1 just fine. I don't recall which ECM the trucks used for the Gen III 5.3s, but you may very well need to use the LS1 ECM and harness as well.

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