Join Date: Feb 2006
Location: Boise, ID
Bronco Info: 1981 300ci 6cyl w/4bbl conversion. 4spd NP-435 manual. 32" tires.
If you were to re-ring the engine, you'd need to disconnect the motor and transmission mounts and jack the engine up as high as you could. Remove the intake/exhaust manifolds, head, and oil pan. Then, disconnect the pistons and pull them out the top. In my experience though, making it easier on yourself by skipping what seems to be a difficult step usually just makes things a lot harder. Meaning, this would be a lot easier if you just removed the engine and put it on a stand. It'll be work to do it, but once you actually get into the job, you'll be glad you did. Plus, it'll give you a chance to fully re-gasket everything and check other things over.
However, before you do all that, I agree with others that you should do a compression check on it. Might not be anything wrong with it at all and all you need is a good carb rebuild and away you go.
March 2016 FOTM
1981 Bronco. 300 I6. 450cfm QuickFuel 4bbl. BFG A/T KO2 32x11.5" tires. NP-435 trans. EFI exhaust manifolds. 2.5" Exhaust. DUI performance ignition. Redhead steering box.