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#1
03-10-2023, 09:52 PM
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If the exhaust valve is not working (for whatever reason) that would contribute to the carbon fouled plugs. It would be easy to back off the #8 rocker arm (when the intake valve is staring to close) in order to see if the push rod is straight.
If it's bent, well that would be an easy fix. But, usually there is an underlying reason the push rod is bent. In my case (early years) it was due to missing 3rd gear  You could say I broke some parts while honing my craft 
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#2
03-10-2023, 09:57 PM
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The exhaust valve not opening enough will cause a backfire thru the carb, as the cylinder IS getting gas and firing, but the burnt gas can't get out of the cylinder, so it will back up into the intake when that valve opens.
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Mitch 1970 Chevelle SS 1966 Chevelle SS 1967 Camaro ss/rs 1938 Business coupe, street rod 2000 FXSTS, original owner, 13k miles
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