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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Sep 2007 Posts: 4 New Guy | | New Guy Joined: Sep 2007 Posts: 4 | running a 350/350 combo.engine has a mild cam,HEI dist.with vacuum advance,holley 4-barrel which i just cleaned out.truck hesitates off the line and surges when running down the road.had it timed to 10 degrees at idle and tried to set it between 28-32 fully advanced but could not get it under 40.checked for vacuum leaks,could'nt find any.HELP! | | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | You must time it with the vacuum advance disconnected. You should get about 34 degrees full advance without the vacuum. The vacuum will add a few degrees at cruising speeds for economy. I find some engines surge like that with the vacuum advance. Try driveing it with the vacuum disconnected & plugged. You may have to get an adjustable vacuum chamber & limit the amount of advance. Usually an automatic trans works best with the advance hooked to ported vacuum.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | |
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