Quote:
Originally Posted by Redog
OK I've been pulling my hair out about this for a few months now and I'm no closer than I was back then.
I think I narrowed this down to Vacuum Advance on the dis, but I need some calarifaction. I read that if the advacne isn't working right, the RPMs will run a bit high.
Here's the problem:
I switched to HEI from the points on my Delta project. The RPM's were right on the money with the 3.42's in the rear end. (eg 2500 RPM @ 55 miles per hour and 3000 RPM's @ 70 MPH)
After the HEi was put in, the RPM's are off by about 15 miles per hour, the car is revving at 3000 RPMs when only going 55, and 3500 RPMs at 70. I think the vacuum advance thingy on the dis is messed up, and I'm thinking of replaceing it. The vacuum advance thing was replaced on the points ign before dropping the motor into the car.
Is this the problem? will this fix the problem I'm having?
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You can check you timing with and without the vacuum advance for one thing. Also you might use another tach to see if your in car tach is the same. Sounds like you might have a false tachometer reading after switching to HEI