My swag is compression loss. Chunk of crud under an intake valve? There is a reason gas is spitting back into the induction system. Valve or timing. BTW, backfire is through the induction system and after fire is through the exhaust.
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122 original, well used. Owned since 1972
2182 new to me. Refurbished and gave to my son.
Deere 4300 4WDA HST with FEL
Many old Ford tractors, all gone now
Couple old Ford trucks
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