Posted by Charlie Bilerx on October 04, 2012 at 21:27:26 from (184.108.40.206):
In Reply to: G cylinders posted by 1948 mm on October 04, 2012 at 17:23:24:
Sir, 4.8125", or 4+13/16", is getting pretty close to an absolute max for general boring on a G jug. I personally do not go that big. I have seen a few cylinders start to pin hole fail at that diameter. MM offered 4+13/16" pistons, for a short time. They stepped back to 4.751" true finished bore diameter and never looked back. At that diameter, problems all went away.
There are a lot of sixty, ninety, and one eighth inch overbore pistons out there that will fill the bill, and replace the original pistons. Many are using Dodge pistons and using a thick walled bushing to go from 1.0625" to the 1.25" pin diameter needed to use G rods.
To select a piston for your needs; you need a piston with a 2.843" compression height to equal the old original MM pistons.
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