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Thread: how much comp with av gas??

  1. #1
    badbug
    On a normally aspirated 496 in a 22ft. inboard outboard, how much compression can you run and be safe with aviation 100 ll gas?

  2. #2
    GofastRacer
    That depends a lot on the cam you have, if you have a lot of overlap you will bleed off compression. I ran 12.5 in my 440 and I mixed 50/50 LL100 with 92 skunk piss with 36 lead with no problems!....

  3. #3
    396_WAYS_TO_SPIT
    Originally posted by GofastRacer
    That depends a lot on the cam you have, if you have a lot of overlap you will bleed off compression. I ran 12.5 in my 440 and I mixed 50/50 LL100 with 92 skunk piss with 36 lead with no problems!....
    Hey Gofast, you ran 36 degrees total? Why did you mix the 92( piss gas) with the av gas?
    I plan on running LL100 in my bbc. heres my cam.
    258@.50 duration int/ex
    .615 lift
    108 lobe
    Whatcha think?

  4. #4
    GofastRacer
    As I said, with a lot of overlap you bleed off compression that's why I didn't have to run it straight!. With a 108 centers you have a lot of overlap, sounds like a street cam you have there!.

  5. #5
    396_WAYS_TO_SPIT
    Originally posted by GofastRacer
    As I said, with a lot of overlap you bleed off compression that's why I didn't have to run it straight!. With a 108 centers you have a lot of overlap, sounds like a street cam you have there!.
    Its a clay smith marine cam
    396

  6. #6
    GofastRacer
    Still a mild cam with overlap, shouldn't have any problems!.

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