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Thread: Ideal bolton cam phasing

  1. #1
    Senior Tuner
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    Jun 2004
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    Ideal bolton cam phasing

    Id assume this is pretty well worked out, what is generally the most ideal intake and exhaust cam positions at say 4000-5000-6000-7000 rpm for a bolton car with a 2018+ manifold? Or with the higher rpm shorter runner manifold?
    Factory Stock 97 SS M6 13.51 @ 104.3 mph
    Stock Longblock LS1 w/ 233/238 P.S.I. Cam
    10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago

    '99 TA trunk mounted 76mm 6 Liter
    9.0s in '09 @ 153 MPH

    Turbo 5.3 Volvo 740 Wagon
    32psi and still winding out 5th on the highway somewhere

  2. #2
    Advanced Tuner
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    My experience has been to push intake to -20 from 2000 to about 4000. 5000 is a crossover and doesn’t make much difference either way. Then retard to about 15 by 7500. Exhaust doesn’t affect it that much. 15 works well enough. Maybe advance to 10 after 7000.

  3. #3
    Senior Tuner
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    Baltimore, Md
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    Arent the numbers referred to differently for Gen1 2 and 3?
    Factory Stock 97 SS M6 13.51 @ 104.3 mph
    Stock Longblock LS1 w/ 233/238 P.S.I. Cam
    10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago

    '99 TA trunk mounted 76mm 6 Liter
    9.0s in '09 @ 153 MPH

    Turbo 5.3 Volvo 740 Wagon
    32psi and still winding out 5th on the highway somewhere

  4. #4
    Advanced Tuner
    Join Date
    Jun 2020
    Posts
    788
    Yes I am referring to gen2/3 timing.