I dont know what engine specs you are running, but if you are running very little ignition advance you get ALOT of heat through the exhaust. It depends on camshaft size a bit also. More cam, needs more Advance.
I dont know exactly what the temp differences are, but it feels like, atleast, a Bazillion degrees difference.. Or around there in the ballpark someplace..
Even if it is only at idle/lower RPM. Say, under 10 degrees is horrible for engine heat, over 15 is night and day compared!
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