1979 dodge power wagon

my guess would be that the timing is off, it doesn't need to jump time to backfire thru the carb. if it backfiring thru the carb then back off the timing advance. Example if time is 6 degrees before TDC adjust it back down to 5 then 4 and so on until the backfiring stops, if it worsens go the other way until it stops. if i read you post right, you put in a cam shaft? A new cam will cause timing issues during break in, if not properly tuned valve damage can happen. I'm just a back yard mechanic so it sounds to me like you need someone with a bit more exp than me but If it were mine though i would 1 start it and let it idle 2 loosen distributor and adjust timing back until back fire stops (or forward if need be) 3 let it run in idle for about an 30 to 45 mins paying attn to engine sounds 4 give a couple revs and listen for backfire and adjust time as needed. 5 check and see if you've adjusted time too far by checking exhaust, if the exhaust sucks your hand up to the tail pipe (even for just a brief second) then adjust time back forward a bit and re-check. You should feel a constant pushing from exhaust pipe, no drawing in of air Once you've resolved those issues lock the distributor back down and take it a for very light test drive and listen to engine sounds. If backfiring continues repeat the process depending where the backfire comes from, Carburetor (back off) tail pipe (advance).

Agree. The timing is off a lot.

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