427 copo Holly jeting - The Supercar Registry

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		The Supercar Registry > Dealer Specific Discussion > COPO - United States
427 copo Holly jeting

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07-03-2019, 03:07 PM

dmarr35

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I am installing the stock cam they changed the jetting and power valves for Drag do you know if GM changed or altered the jetting when installing on their engines all I want is to star off at stock so when I first start up I can bring the engine to 2000 for cam break in it just makes me crazy Holly can not or will not help with info

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