312, when I first tried turning it over with a breaker bar it would only turn about 7/8's of the way, either rotation, then it started going completely around with no problem but now it's hanging up in the same place again. My daughters firebird did that and it was a spun bearing, any thoughts on this before I tear the caps off. Gary

       

Gary, 55 Vicky, St. Germain, Wisconsin

 

Valve hangine open and the piston hitting it?  Foreign object in a cylinder that moves from place to place?  I dunno.

John - "The Hoosier Hurricane"

#'s 2 & 8 pistons are all the way up when its locked, all valves are ok, #'s 5 & 3 are all the way down and are just missing the crank throws. Looks like I might be tearing this down further than I planned

       

Gary, 55 Vicky, St. Germain, Wisconsin

 

Something in the distributor gear or oil pump?


Lawrenceville, GA

The distributor is out, I was pumping oil to the rockers, right side was put together wrong but I've taken care of that and I'm getting some oil to the top now. I'm gonna try to see the chain for a problem. Gary

       

Gary, 55 Vicky, St. Germain, Wisconsin

 

Is it still in the car? Might it have something to do with the transmission?


Lawrenceville, GA

engines out, on a start up stand. Just had the wife try to turn it with a breaker bar, I can slide a feeler gauge between the piston skirts and the throws, so it's not hitting there. It stops in the same place on the balancer no matter which way I rotate the motor 

       

Gary, 55 Vicky, St. Germain, Wisconsin

 

Just looked at all the rod bearings, # 6 looked a little suspicious but they all passed, although they are all in real bad shape. Did notice that # 5 piston is new, looks like it's not been run much, if at all, from the bottom it has no scoring or oil splashed up into it, super clean. Mains tomorrow

       

Gary, 55 Vicky, St. Germain, Wisconsin

 

Top ring on 2 or 8 hitting a ring ridge at the top of the cylinder?

John - "The Hoosier Hurricane"

Just pulled the heads, large deposit of carbon on the bottom edge of # 2 cylinder, couldn't see it thru the spark plug hole, not much of a ridge, engine turns over freely now, looks like a good 312, not sure if I'm gonna build it or sell it. Gary

       

Gary, 55 Vicky, St. Germain, Wisconsin