cyl. head #'s

rustred · Nov 14, 2020

i have a head # 8777 , is the low compression head or the better one? as for farmall m or w6 and such.

Absent Minded Farmer · Nov 14, 2020

The 8777D is the distillate head. You would want a 8060D which was the gas variant for the M. Super M through 400 had a 8574D. The 450 had a 362433R1 or 2.

Mike

rustred · Nov 14, 2020

thanks that what i thought, its junk.

Absent Minded Farmer · Nov 14, 2020

I've often wondered if you can just shave those & put shorter valves in.

Mike

fixerupper · Nov 14, 2020

I compared the higher compression head with a lower compression head for an SC Case last winter. The combustion chamber is smaller in the higher compression head. There must be a reason why the factory used a smaller combustion chamber instead of merely shaving the head.

used red MN · Nov 15, 2020

Absent, I don’t know how to say this nicely but your way of thinking towards shaving a head is flawed in two ways. For one milling off the face of the gasket surface does nothing to change the dimensions of the valve seat to the spring seat surface that determines the length of the valves. Secondly the higher compression heads use longer valves not shorter ones. This is because the combustion chamber of a higher compression head is shallower not deeper. So the valves are longer in the higher compression application. Hope this makes sense, it seems hit your head simple to me. The distillate heads have very deep combustion chambers. If you tried to mill enough off of them to come close to the smaller combustion chamber of the gas head, you would probably make the gasket surface to the water jacket distance to thin and it may even break through in places. You may not have enough stud threads and the rocker arm geometry would be way off and there probably would not be enough adjustment for proper valve lash.

rustred · Nov 15, 2020

i have not dug into the differences but yes it makes sense.

the tractor vet · Nov 15, 2020

You can only SHAVE off so much off a head before your get to close to the water jackets or you make the holse to large at the water passages . In the OLD days when we would machine a head we USE to stamp how much we took off so that down the road the NEXT guy knew someone was there before . Also there USE to be a BOOK that gave you the min. head thickness . I would still stamp a head on the end . Same goes with shaving the beck of a block and re cutting the contour bores . Ya take lest say .015 off the head and the same off the block you just removed .030 total and made it higher compression . Sometimes a little goes a long way . Sometimes while C/C ing a head you have to cut the head at and angle . sometimes ya have to do that to the block so all pistons come up to deck all the same .

Absent Minded Farmer · Nov 15, 2020

Can't know without learning.... or re-learning. It's been so long since I read up on head milling that I forgot what the details are. Now I've had a refresher & I thank you.

Mike

D Slater · Nov 15, 2020

M gasoline used 8060 D to DC and 8574 D to DA to serial number 294977. Starting serial number 294978 head 8574 DB started use around with 8060 DC at about that time. Then used on gasoline SM through SMTA tractors. 400 and 450 wheeled tractors never came with a 8574 head, they used 362174R1 and 362433R1 on gasloine with 362174 being the most one used on 400 and 450. Never found a original 362433R1 head on a first year 400, only 362174r1. Gasoline head number was also used on part of the 400 LP tractors. IH had replacement heads 8060 DD and 8574 DC.

cyl. head #'s

rustred

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Absent Minded Farmer

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rustred

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Absent Minded Farmer

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fixerupper

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used red MN

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rustred

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the tractor vet

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Absent Minded Farmer

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D Slater

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