I followed the cam breakin procedure provided and used comp cam breakin oil and howard's cam zddp additive. used the lube on the cam lifters etc. The oil in there now is meant for new engines, but I can't remember the brand.
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Originally Posted by cableguy0
Popping through the exhaust is generally a rich condition. Raw fuel in the hot exhaust ignites and causes the popping. Popping through the carb is usually a lean condition or improper timing. Did you run a zddp additive and the proper oil during break in? How exactly did you break it in? Did you let the engine idle at all? What oil are you running now?
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