Not Ranked
Valves are to tight.....hopefully it hasnt killed the cam or lifters but hope wont fix it. The valves are hung open probably only when hot, causing the flame front to go out in the exhuast. Ofcourse its just a guess. Id check to see if the valves are closing all the way, easy to do.
Also 370 at idle is way way rich......glowing doesnt happen to well after 1600 or so.....most well tuned carbedengines idle around 550-650 and efi engine can idle as high as 750-850.....degrees meaasured 1 incj off the header flange on the top of the tube.
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