HomeForumsTechnical – GeneralEngineQuestions, Holden 308 V8

This topic contains 2 replies, has 2 voices, and was last updated by Profile photo of Immortality Immortality 2 years, 6 months ago.

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  • #22032
    Profile photo of VHSLE CRUISER
    VHSLE CRUISER
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    Member since: October 1, 2016
    Posts: 38

    My car is a VH Commodore, mild 308 running a Holley 600DP carby, front squirters=28/rear squirters=32, power valve=6.5

    1. My carby has straight booster rings,would there be benefit to changing to annular booster rings ?

    2. Running an edelbrock performer rpm intake manifold, is a dual plan but is notched out, is there any benefit changing to the same intake manifold but without the notched part ?

    3. Carby spacers, open vs 4 hole , which is better for fuel atomizing or is this dependent on the engine combo ?

    4. Ported vacuum vs manifold vacuum ?

    5. Will running a carby without gaskets underneath/between the carby and intake manifold cause any issues long term ?

    6. What is the general guideline for both initial and total timing for a mild 308 ?

    Cheers,

    #22082
    Profile photo of VHSLE CRUISER
    VHSLE CRUISER
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    Member since: October 1, 2016
    Posts: 38

    No replies…

    Cheers,

    #22083
    Profile photo of Immortality
    Immortality
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    Member since: August 31, 2015
    Posts: 528

    This is probably a question better asked on the AV8 forum where there are a lot experienced guys with these sorts of engines/setups.

     

    Standard initial timing on a 308 is 6°BTDC however it’ll probably run better with a little more initial timing.  IT really comes down to the cam/compression you have as well as the fuel you are running.

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