Reving a motor up even 8000 rpm out of gear and non loaded will not produce the combustion temps that take place when running down the road under load, so your lack of smoke in the garage test makes sence.
If its a rich running carb issue when letting off the throttle then the carb would be running rich also at other times and you would smell that, but that being said, if you rub your finger around in the end of the tail pipe is it a grayish dry black that gets on your finger, or is it a oily black on your finger?
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
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