If it is a press fit, it might be hard to get out. If it is pressed in, it will probably not leak from a tiny rusting in of the sleeve in the bore. If rotatable, it relies on the "O"ring to do the sealing, and is designed that way. If you didn't deepen the ring groove, it will for sure fill the groove with squished "O"ring, and not leak. But it will be necessary to use good practices on insertion, including polished edges on the hole, and sleeve entry bevel to avoid scraping or knicking the ring. as well as using straight dish detergent on the rings and sleeve to allow slipping into the hole W/O excess force. It may take some force as the "O"ring will be compressed a bunch. On the above block height of the ring, I would go for the .004" mark. This prevents excess pinching at the combustion chamber, which can make the gasket edges around the waterjacket and external block seal less tight than good practice. If you are putting in high dome (high altitude) pistons, and the big bore, calculate the compression ratio. Use the new engine displacement divided by 4. converted to CCs (Swept volume). CC the combustion chambers (select the smallest of that lot) then subtract the volume of the dome on the piston sticking up into it, and add the compressed thickness of the gasket (as a volume of the hole where the combustion chamber is located) to ad to the combustion chamber CC (old gasket for thickness) Take the total swept volume of one cyl and divide the total combustion chamber real volume into it. For example if swept volume of one cyl was 480cc, and volume in combustion chamber plus head gasket, minus dome volume was 64cc, the compression ratio would be 7.5:1 Shaving .125 might be excessive. There is water in the head that might find new holes to get into oil (I do not know how far one can go, but others may). A cylinder pressure of more than 165 PSI is obtainable. As is the nead for premium. Fast engines can use more compression and more davance. but these slow crankers will die from detonation, they just can't handle the flame front travel rate of regular and high compression. keep us in the loop. JimN
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Today's Featured Article - Tractor Profile: Earthmaster - by Staff. This tractor, manufactured by the Earthmaster Farm Equipment company in Burbank, California was made for only two years. The Model C came out in 1948 and was followed by the "CN" (narrow-width model), "CNH (narrow-width high-crop model), "CH" (high-crop), "D" and the "DH" (high-crop) in 1949. The main difference between the models was tire size, tractor width and cultivating height. The "D" series were about 20 inches wider overall than the
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