Quote:
Originally Posted by ClickClickBoom
Check your CO, my ‘75 did the same thing when I took the thermal destroyers off and replaced them with SSIs and a sport muff. More airflow caused it to be way lean. Corrected it with the CO meter and never looked back.
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Specs for our SC's ( I have an 1982), is to set the CO to .4 to .8% at 900 rpm at operating temperature. I think this is too lean if you are running ethanol gas and in Texas summers. Add to that you just put in a free -er breathing exhaust that needs more fuel, so its running even leaner now- what ClickClickBoom said.
I would start and set the CO to 2-2.5%, and see what happens. Should be easy-- you have an AF meter and it will cost you nothing.
I'm kind of curious what your AF's are at cold start. You said you do experience hard cold start at times.
Dave K