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Re: Missing at cruising speed. Confused.
Don't get hung up on the heads, unless your running it hard or towing those "unleaded" heads will stand up to normal driving for a real long time, without additives. Check to see if the number 5 & 7 wires are touching anywhere. They are in line in the firing order and can cross fire. As geezer said it's time to dial in the timing. Make sure vacuum & mechanical advance are doing their job at the right RPMs.
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1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner.
1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components.
My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703
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