I changed the cams out to T555 (from Tmans Performance), installed adjustable P/rods and a stage one breather. I'm trying to dyno tune it but have continuous back firing even with dumping more and more fuel to it. is probable cause an intake air leak? I didn't do anything to the intake or throttle body other than change the airfilter and backing plate. The back firing occurs at high RPM. Any assistance is greatly appreciated.

 

Not enough info. What kind of exhaust and tuner do you have? It could be an intake or exhaust leak depending on what your setup is. If you don't have any leaks it's your map. Should be able to tune that out as long as you don't have any mechanical causes for the backfire.

 

How did you adjust your pushrods, and what brand are they?