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Exhaust Backpressure & Vacuum 120-130

posted by  walrus3 on  Wed Apr 19 12:15 CST 2006
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last visit: Mon Dec 2 14:20 CST 2013
[RELATED]

There are some other things that might be giving trouble. Would be good to
make sure you don't have a flat lobe on the cam. This is pretty easily
checked with a steel rule with the valvecover off. Measure against the
top surface of the head to the valve spring retainers. Open should be about
3/8" different than closed. If you have one that isn't opening that far
you need a cam and new lifters.

Is your exhaust system open? No mashed pipes, etc?
The fact that one cylinder is 125psi both dry and wet indicates a small
valve leak.

And I go for a bit more advance than Rhys. I set mine at 20° - if you have
vacuum leave it connected when you set it to 20°. You might see better perf.
and cooler running.
--
George Downs Bartlesville, Heart of the USA!






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