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ChadS
09-02-2004 08:14:42
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Re: Farmall M engine Kits in reply to Robert in AL., 09-01-2004 13:38:38
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It depends on what year of block you have. Earlier M"s, had a smaller bore casting in the block and cant be bored that big with out making the block thin. if memory serves, the 39-45 248 blocks are in this catagory. 3-7/8 bore M blocks. then the later M"s had a bit thicker walls in them, My opinion with this change and it is my opinion,, that M&W was coming on stronger with more parts to offer, and these blocks could not take what they were designing. Also,, the newer as the model progressed, the M"s got stronger, and had more options in the later years. Changes in cubic inch, heads, cams fuel, made significant hp gains. If you have a later model M block,, and it has 4 inch, thick walled sleeves, yes, the 450 sleeves would fit with boring the block to fit the sleeves, A little thing to remember,, is on the 39-45 M"s max bore no sleeves, was 4.25 and that was thin!! Later blocks,, 46-51. with thin walled sleeves, they were at 4-1/8 with no sleeves, then you get into the Super M-450 blocks,, the 264 and the 281. Those blocks are the best,, big bore potential, 4.5 and still run on the block,,, now I know you said,, not a puller,, I understand,, After building alot of bigger cubic M"s rebuilds, The Dennys disaster with using these small casted blocks,, for his 4.310 bore,, I have learned alot about the M blocks,, That is why I explained it that way,, The later the engine block, the less $$ to bore it to fit the 450 sleeves. Would be a great investment to do this upgrade to the 281, I dontthink it would be as strong as the 450,, the heads, cam carb, etc were not the same as the M in design. would be a solid 65-68 hp easily with M parts. Just my 2 cents,, ChadS
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