Posted by David G on November 12, 2020 at 07:36:51 from (209.181.208.169):
In Reply to: Chevy engine experts? posted by svcummins on November 11, 2020 at 19:13:07:
Backfiring under load can be several things including bad spark plug cables or even stuck mechanical advance. It is important to remember that as cylinder pressures increase, so does the the voltage required to create a spark. Having 20" vacuum at idle is a good thing, that means the engine is relatively healthy.
You are just gonna have to troubleshoot.
For the guy trying to gain mileage by changing carburetor and going back to points, that makes zero sense. I would put an aftermarket EFI with computer controlled timing if trying to make gains. There are kits out there, or can get the parts off a newer engine and put microsquirt on it. You would then have the opportunity to really tune it.
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