The Stovebolt Site Forums The Shop Area Engine Shop 0.100" overbore on a 235??

I have a '55 4400 truck with a 235 engine. The engine is shot. I have another '56 235 engine in a '37 Chevy 1.5 ton truck made into a tractor. It runs, and I am swaping that engine into the '55. I pulled the head on the engine to give the head the once over before it goes into the truck. I checked the cylinders for roundness, and have come up with a average number of 3.567" bore. My Motors manual says the bore of the 235 is 3.452". Is this a misprint??? I am reading the mics right, and my tools are not inaccurate, at least that much. Could the 235 be bored out 0.100"? The cylinders are round, the pistons fit well, and bores are smooth.

Any thoughts on this???

Blue - my manual says a stock bore is 3-9/16 inches which is 3.5625" Sounds like the bore is fine.

Also the top of the pistons should have the oversize stamped into them if they are oversize.
0.10 , 0.20, 0.30 and so on.

Ok, my book must have a misprint in it. I cleaned off the pistons and looked for the stampings of oversize, but did not find any. Ken, your numbers make sense, as I have about a .005 - .006 ridge on the top of the bore where the rings dont hit. Is the wear on this engine (.005-.008) acceptable?

That might be acceptable as long as the ring gap and ring lands are and the cylinder taper isn't too bad, but you might want to have it bored 0.10 over if your ring or piston gap is out of spec. Don't bother getting the pistons knurled, that won't last.