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Old 08-13-2024, 05:55 PM   #10
geezer#99
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Join Date: Aug 2009
Location: Bowser
Posts: 13,712
Re: GMC 305 v6 Holley 500 swap woes

Those uncalibrated pencils are usually off 10 degrees or more.
The only way is with a piston stop.
But first check your timing.
Make sure to plug off all the vacuum ports when doing timing.

Factory timing is 5 degrees before top dead centre.

https://www.summitracing.com/parts/cca-4795

Last edited by geezer#99; 08-13-2024 at 06:02 PM.
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