Bbc 454 build
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Bbc 454 build

  1. #1
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    Default Bbc 454 build

    I have a 2 bolt 454 that is bored .030 over, and I have the wiseco forged rotating assembly kit with flat top Pistons. I bought aluminum heads. What kind of Vance springs, roller rockers, and girdles should I use? Want the motor to hold up to anything.

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  3. #2
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    Not enough information. Which heads? Required outside diameter of springs? Already have the cam? What are it`s numbers?

  4. #3
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    The intake runner volume is 320cc, and the combustion chambers are 118 CC. I do not have a cam. Also needing help on that as well

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  6. #4
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    Combustion chamber 118cc
    Spring pocket Is 1.6250?, no deeper
    Rocker 1.7 ratio

  7. #5
    Some guy obnoxious001's Avatar
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    Have you figured your compression yet with your flat top pistons? With 118 cc chambers you would normally use a piston with a small dome for a pump gas "performance" engine to get it up over 9-1 compression. With a typical -3cc valve relief in a flat top piston, even if you have zero deck you will be at around 8.18-1 compression. Also, it's not a bad idea to leave .005" extra on the deck so that it could be surfaced again in the future.

    My first suggestion is to see if you can trade your pistons for some that would bump the compression up a bit. No need to talk about cam until you know what compression the engine will be, exhaust system, induction, intended usage, including rpm range (assuming you have a jet since you are in the jet forum, what do you plan to do to the pump and impeller). If you plan to run an A impeller which will limit rpm, probably no reason to worry about stud girdle. If you decide to run a stud girdle, it needs to be designed to fit your particular heads, and without you stating which heads you have, I will guess they are the Speedmaster/Pro Comp, which are fine for your usage, but I found their stud girdle not to fit their own heads properly.

    Spring pressure normally gets recommended by the cam grinder or engine builder, and are dependent on what type of cam, and to some degree intended usage and rpm.

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