Performance Cam and Vac Advance -
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post #1 of 3 Old 07-10-2013, 09:58 PM Thread Starter
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1978 CJ7 
Join Date: Aug 2012
Location: cincinnati
Posts: 57
Performance Cam and Vac Advance

As I rebuild my engine, I've got the old girl idling well at around 8* BTDC @ 1000 RPM (15" Vac). This is apparently the norm for having an Edelbrock performance cam the PO installed.

I had to install a reman distributor from autozone, and it still idles fine, but plugging in the vac advance causes the engine to go haywire. I confirmed it wasn't a vacuum leak, and the vac advance canister holds a signal perfectly well.

Is there something that I'm really missing? Does the upgraded cam mess with timing to a significant degree? Is it possible my centrifugal advance is already in at 1000 degrees, so it doesn't have much further to go, thus causing the vac advance to cause stutters/backfires/and bogs?

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post #2 of 3 Old 07-10-2013, 11:00 PM
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1983 CJ7 
Join Date: May 2009
Location: Texas Hill Country
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Are you running an HEI, by chance?

Live in a way that those who know you but don't know God will come to know God because they know you.
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post #3 of 3 Old 07-12-2013, 12:59 PM Thread Starter
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1978 CJ7 
Join Date: Aug 2012
Location: cincinnati
Posts: 57
MSD Ignition, Upgrade Cap and Rotor (Team Rush'd), 8.5 wires, etc.

Stock dizzy though (reman'd).
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