Farmall M pulling engine

I am new to tractor pulling and have been going at it with a 55' John Deere 60 but it is more of a show tractor so I bought a 1940 M with a stuck engine to build up just for pulling. Does anyone no a good engine builder in eastern NE or western IA? How about a rough idea on what I need to get 100hp or so? I have a friend that pulls with a G that I'm pretty sure makes about 90hp and he does really well so that's where I'm getting my HP #'s.
I've been searching the forum but the post's about this topic are dated so I thought I'd bring it up again. I would pull in the 6000# and 6500# "classic" class for our local pulls (little red sled). It is 3-1/2mph limited, 10% over stock rpm. No add on fuel pumps, any air cleaner. 18.4x38 tires.
Any advice I can get would be appreciated!

4.310" - 4.375" bore, and at least a 6" stroke. But if you are doing a 6" stroke, you may as well do 7".

get all your parts from Murphy's or get Gary Baker to build you one . if you go with Murphy's with a 6.75 stroke and a 4.310 bore ,with their rods there won't be any grinding . Gary Baker will do it all and send you a running engine .

(quoted from post at 17:32:08 08/04/15) get all your parts from Murphy's or get Gary Baker to build you one . if you go with Murphy's with a 6.75 stroke and a 4.310 bore ,with their rods there won't be any grinding . Gary Baker will do it all and send you a running engine .

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So Murphys makes a stroker crank for a M? I assume its the same crank for a super M? Is there a website?

http://www.murphysmotorservice.com/

Its going to be tough to get 100HP without a fuel pump (IMHO). Gravity can only do so much...

Regards,

Goldsburg

The rules also say all tractors must have original block and cylinder heads. Does that mean I have to use a c248 engine and head? Mine is a 1940 dual fuel(low compression) with 6722-DC stamped on it. Can I run a c264 and LP head? I will get ahold of Murphy's also. I checked out their website. They have cranks, rods, pistons, do machine work and head work including port, polish, and flowbench and it says they also do complete assembly. Thanks for the advice so far now just curious on engine size limits?

Still curious about the rule in the class I want to run that says all tractors must have original block and cylinder head. Ive been doing some research just for my info. So a c248 for an M, c264 for a super M or 400, and a c281 for a 450 to meet the rules? I see that the bore, stroke, and compression ratio are what changes from engine to engine. Are the blocks about the same meaning a c248 can be bored as much as a c264 or 281? Sorry for all the ?'s, just want to understand what I can build from what the rules allow. If the blocks aren't the same wouldn't it be to your advantage just to run a super M/400 or a 450?

(quoted from post at 23:49:47 08/04/15) Still curious about the rule in the class I want to run that says all tractors must have original block and cylinder head. Ive been doing some research just for my info. So a c248 for an M, c264 for a super M or 400, and a c281 for a 450 to meet the rules? I see that the bore, stroke, and compression ratio are what changes from engine to engine. Are the blocks about the same meaning a c248 can be bored as much as a c264 or 281? Sorry for all the ?'s, just want to understand what I can build from what the rules allow. If the blocks aren't the same wouldn't it be to your advantage just to run a super M/400 or a 450?

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You could probably get away with a Super M block in a M. But the 400 or 450 block would be obvious because of the dipstick.
As far a how big of sleeves you can run, I am not sure. I think the 248 can be sleeved to 264 but the 264 can be sleeved to 281. But again, not 100% sure of that.

If it matters my argument on the c281 block would be that if you bought a replacement block from IH you would be sold a 450 block...a 281 is a manufacters replacement for the older blocks....IHSMOKE

this is rule ten of division 3 which is the first class that you can make changes to the engine and have to remain stock in appearance. 10.Tractors must have the stock engine, frames, transmission, rear end and axle housings or manufacturer's replacement for make and model of tractor being pulled . Stock heads and their replacements are to remain unchanged in outside appearance. No 7 bolt main blocks in Oliver's; no (12) port heads; no 99 heads; no 1600 series heads. AC - WC/WD/WD45 can use D-17 engine; IH - H, 350; M, 450. JD - A/B/G can use power blocks. No M-M 800 heads or blocks. Dual exhaust not allowed except after stock manifold.

(quoted from post at 23:23:51 08/04/15) The rules also say all tractors must have original block and cylinder heads. Does that mean I have to use a c248 engine and head? Mine is a 1940 dual fuel(low compression) with 6722-DC stamped on it.

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I would think if you got rid of that head and put a gas head on, no one would be the wiser.