Well iam betting that that E is really an B as they never used a E class bore . SOOoo ya need three std. bore sleeves and three oversized sleeves . All I H gassers have harden seat and stelite valves . Adding SNAKE OIL really does nothing . The use of a non low ash oil is what causes the exhaust valves to torch . ANd the use of Hightest gas is required for working the tractor as it burns cooler and longer . giving better power and lower heat on the top of the pistons . Trust me here as i have worked on a lot of the gassers and we still run two 706 gassers . Now here is some food for thought , To get away from two different size sleeves You may want to think about maybe maken her a 291 . This can be done by having a GOOD machine shop bore the block and getting the sleeve and piston set that is made to take a C263 out to a 291 . Now there are a couple things that will need changing along with this set up , one is getting the Dist recurved to the timing spec.'s of a late 291 engine and myself i like to rework the carb by reaming out the main jet .001 , for this i had a local drill bit mfg. co. make me up a ream for this . AND that is all that needs to be done and ya fallow the skirt to wall clearence that i posted before and run the Low Ash oil and the 93 octain gas and break that engine in for 35 -40 hours with light to med loads and it will give ya years of service .
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