I posted this in the F-150 forum as well, but figured it belonged here as well.

I have the motor out of my truck, and the original plan was to put a LTD 302 in it, but I decided to take the heads off and look at the bores before I started pulling the motor on the LTD.

The motor had low compression, and would leak oil out of the airbox after about 20 miles of driving(ick I know) so I figured I had a broken ring(s) or a hole in a piston, well everything in the rotating assembly is fine! I did measure the cyl. bores, and they are all at about 4.004, which according to the service manual is the high limit of the tolerance.

The choice I have to make is weather to still pull the 302 out of the LTD, and "hope" it all bolts toghether, or re-ring this one.

If I re-ring this one, the plan is to hone each cyl bore 5 strokes, buy the speed pro 4.005 moly ring kit( 5 thousands over rings) and cleavite77 .001 undersize rod bearings.

None of my bores measure egg shaped, and I did not hear any piston slap when the motor was running and cannot see any scuff on the piston skirts.

Does this seem like an ok route to go? As long as this motor makes it 50k i would be extreamly pleased. Any feedback good or bad would be appricated.

thanks

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Where did you measure the bore? Up top can look good and the bottom can still be out of round.

 

Sounds like a plan. I'd just run a glaze breaker in the bores to rough em up for the new rings though. And mic the crank, it may just be OK with fresh bearing inserts and a high volume oil pump to take care of any slack.