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jtproudmarinedad
11-12-2009, 07:38 PM
I just bought a 1980 Ford F-150 Custom 2wd P/U it has the 351M engine in it with 89,000 miles. the guy I got it from said that it backfired real bad and just quit running. I got the truck home ripped the heads off of it and found a bent #7 exhaust pushrod. after inspecting the heads there is also a bent #7valve. What could cause this? and could there be more damage internally? I drained the oil there seems to be no shrapnel or any metal shavings in oil. I also checked timing it didn't jump timing.
Thanks
JT
foxbodydave
11-12-2009, 07:43 PM
couldve been a spring that broke and caused the valve to drop. or possibly a lifter problem?
jtproudmarinedad
11-12-2009, 07:47 PM
couldve been a spring that broke and caused the valve to drop. or possibly a lifter problem?

The inner sping looks like it could be broke
What I was thinkng was maybe get the heads done get a decent cam for towing with new lifters and pushrods and call it good.
foxbodydave
11-12-2009, 07:54 PM
how many miles are on it? you may wanna look at the bearings and whatnot just to be on the safe side
jtproudmarinedad
11-12-2009, 08:08 PM
how many miles are on it? you may wanna look at the bearings and whatnot just to be on the safe side

89,000 miles on it. I was thinking about checking out the bearings but from the looks of the inside of the engine it has been well taken care of, there is no sludge build up at all. I didn't want to tear to far into it unless its needed. I just need a decent tow rig to get my car back and forth on track day. So I'm thinking cheap fix if possible..
Sean
11-13-2009, 10:01 AM
Typically overeving. Does it have a aftermarket camshaft in it ?
jtproudmarinedad
11-13-2009, 12:41 PM
Typically overeving. Does it have a aftermarket camshaft in it ?

No this thing is stock I got it from the original owner. Nothing has ever been done to it besides a timing chain and water pump.
Sean
11-13-2009, 01:51 PM
No this thing is stock I got it from the original owner. Nothing has ever been done to it besides a timing chain and water pump.

I don't know how much running clearance these engines may or may not have but I would check the Timming chain to make sure it is properly indexed and the correct chain.
jtproudmarinedad
11-22-2009, 04:02 PM
I don't know how much running clearance these engines may or may not have but I would check the Timming chain to make sure it is properly indexed and the correct chain.

I pulled the engine and am dropping one of the 460's I have laying around into it. It seems the 351M and 460 have the same tranny bolt pattern and are direct bolt up's. The 351M is slowly making it's way to the scrap pile....