M block, 4.25 is bout it for bore size increase and run on the block, sleeveless. You will have to bore the block to fit in the 450 sleeves which the OD is 4.25. Dad n I used to make tall domed 450 piston n sleeve sets, that used a .500 tall dome. I think I still have a set here if youd like to see em. Ive seen em dyno 75hp with a 8060 head n 450 cam. seen em dyno over 85 with the LP head on high octane fuel. It aint no 600ci billet monster, but makes for a mean 281ci motor. Hope this helps. Chad
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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