85 C10 305 loud thump

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mojuave

Junior Member
Joined
Apr 18, 2021
Posts
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Location
plymouth, pa
First Name
Mike
Truck Year
1985
Truck Model
C10
Engine Size
305
so I bought this 85 on a whim and plans to fix it up. So heres the story all I have done is move it from one spot to another. The spot I moved it to last year I now need to move it again however when I try to start it, it cranks fine but right at that point where it should fire on there is a loud thump like someone hit it with a baseball bat. It doesn't start I just stop the crank right then at that.

I asked a few guys that know more about engines than I do but they seem to be stumped. One said sounds like a rod or valve but another one said it wouldn't crank smooth like it does if that was it.

Any ideas to look for to get this to run again
 

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