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BUBBAS IGNITION · 03-04-2016, 08:44 PM

Using a chevy conversion the addition of vacuum is pretty hard to tune on a flathead.
Like someone said above the vac canister is adjustable using a allen wrench thru the vac tube (largest one that will fit inside the tube) and turning the screw against spring tension to make vac come in with higher vacuum.
It is more than likely set at the lowest setting..

03-04-2016, 08:44 PM	#3
BUBBAS IGNITION Senior Member Join Date: May 2010 Location: SPEEDWAY INDIANA Posts: 4,148	Re: ignition ping when vacuum added Using a chevy conversion the addition of vacuum is pretty hard to tune on a flathead. Like someone said above the vac canister is adjustable using a allen wrench thru the vac tube (largest one that will fit inside the tube) and turning the screw against spring tension to make vac come in with higher vacuum. It is more than likely set at the lowest setting.. __________________ If it Makes Spark, we do it !!!! www.bubbasignition.com [email protected]