Super C sleeves in Super A block

Few days back We discussed this....I opened the holes in the bottom web of the Super A block to 3.434 in. The sleeves are 3.436 in.OD. (may be a few few ten thousandths off either way ) A 3.434 sleeve (scrap pile gage, turned on lathe) will slide in the hole , 3.436 won't go. Then...Readin' the I&T service manual, manual says " All sleeves should enter crankcase bores ( what I'm callin' holes in bottom web ) and should be free to rotate by hand when tried in bores without sealin' rings". It's not a big deal either way but what do I do now, press the sleeves in as they are OR chuck the sleeves in the lathe and take enough off the bottoms of the sleeves so they will rotate by hand? It won't take long to take a.001 to .0015 off....Also sleeve standout is between.003 to .007 so that is alot of leeway there, what would all Yaw'll shoot for? I'm gonna run this with a 240 head, I think I've read compression ratio is 6 to 1. If I have the head shaved .060 what would it be, or what would I get shavein'off .125.I don't mind buyin 92 octane to cultivate a few acres of truck patch, maybe 50 hrs a year of actual work is all this tractor will ever do, but I sure don't want to get so radical it becomes a Shed Queen or a Pullin Darlin'..Thanks for the Help

Thanks
Wild Bill

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

Frend of mine took 125 off his 240 head without any problems. You dont want too much of a press fitat the bottom as thats what the o-rings are for. Hey send some warm weather north please

I have the sleeve diameter for the Super C sleeve
at 3.4375" at the seal and the length is 7.060".
Hal

Bill: Happy machining, your proceedure makes a huge difference if your properly equipped.

The sleeves are designed to be a slip fit so that they do not distort when installed. Too tight a fit will decrease the piston to sleeve clearance and could possibly cause piston scoring.