Here is what we have.
It is a fresh built BBC with roller cam, solid roller lifters gapped at .016.
We are running pop up piston's and 34 degree's timing.
When we start the motor and during warm up, it pop's back thru the exhaust and appears to have a miss. (It ran fine while breaking in the cam).
However, once the engine get's to operating temperature (above 175 degrees), the miss goes away and no more popping, it pulls strong up to 5700 RPM.
The headers are up-draft and brand new, no noticeable leak's.
Can anyone help explain this to me?
Should I be worried?
Thanks for your help.
Doug
HELP *** Why is motor popping back thru exhaust when cold?
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