It seems like when im going through mud or putting any load on my pickup that I cant seem to pickup any rpm.. Could this be a timing issue?I just recently rebuild this motor and it did this before the rebuild as well. Any help would be great!

I have a 400m that i just cant get one valve cover to seal up. Its the driver side valve cover and it doesnt seal. The other side seals perfectly fine.. The valve covers are after market mr. gasket chrome ones. Could this be a warped head?? please help!! iv tried everthing!

Hey, I have a 79 400m with aftermarket chrome valve covers and on the driver side valve cover always leaks no matter what i do.. The passenger side doesnt leak a drop.Could this be a warped head? I just rebuilt the engine and it happend before the rebuild as well on the same side.. i dont get...