I bought an engine off of Craig's list.it's a vintage GMC inline 6 with speed equipment,the Ross forged pistons are very nice.It was quite dirty from sitting uncovered in a heated garage.It was a great deal,money wise...............
After cleaning the block I noticed a rust pit about an inch and a half down in one of the cylinders.The cylinders look newly finished and a bore gauge confirms this.Probably was there after honing....It's about 7/16 of an inch around and by sticking a ring in the cylinder I estimate the depth at no more than .002. The cylinders have the proper clearance for these pistons,.0045. Trying to hone the cylinder clean will result in a very sloppy fit, I called Ross to verify the clearance.
I showed the block to the local machine shop I am friendly with.He looked for awhile and said to run it.He says it might use a touch of oil but cylinder sealing should be reasonable.
Boring oversize will make this set of pistons useless,they cost about 700 bucks with the rings.Finding another block is possible of course.But then after boring the block and all that......
Opinions?
After cleaning the block I noticed a rust pit about an inch and a half down in one of the cylinders.The cylinders look newly finished and a bore gauge confirms this.Probably was there after honing....It's about 7/16 of an inch around and by sticking a ring in the cylinder I estimate the depth at no more than .002. The cylinders have the proper clearance for these pistons,.0045. Trying to hone the cylinder clean will result in a very sloppy fit, I called Ross to verify the clearance.
I showed the block to the local machine shop I am friendly with.He looked for awhile and said to run it.He says it might use a touch of oil but cylinder sealing should be reasonable.
Boring oversize will make this set of pistons useless,they cost about 700 bucks with the rings.Finding another block is possible of course.But then after boring the block and all that......
Opinions?