1941 JD A head

4010 puller · Mar 29, 2009

Hello:

I have a friend who has a 1941 JD A. He needs a new head gasket, which is best? While the head is off, he'd like to find a better one (the current one is bone stock other than it's bee shaved alot). It has been bored .125 over, block was decked, and it has a 71 carb. Will a head off of a late a work? If so what is the best casting # to get. If not, what kind of aftermarket head should he be looking for?

Thanks.

Drew · Mar 29, 2009

Murphys Motor Service 573-696-3655 has a performance head/manifold available for that tractor. It has no combustion chamber, which will give you a pretty good increase in compression. With one of these heads, I gained power over a ported/reworked Heisler head.

For a headgasket, go to a local autoparts store and order a Fel Pro 7744SBX. Same thing as you will get at Deere, 1/3 the price.

JLO · Mar 30, 2009

I have an A head that came off of a 43 A, has big valves and has been ported and polished. Comes with eveything ready to bolt on with the head gasket you need to keep it sealed. Asking $500.00 the only thing is I do not know if it will go on your tractor will need to check no's

4010 puller · Mar 30, 2009

Drew:

Is the part number you gave me a complete kit with lead sealing washers and all or just the head gasket it self? I was trying to think of the other head than heisler and murphy's. It was Jerry's, are they hard to find? We're somewhat on a budget and want more power.

Thanks

Drew · Mar 30, 2009

That part number is the gasket only. I dont know of anyone other than Deere to go to for the lead washers.

The Murphys head is a revised "Jerry's" head. Jerry sold out to Murphys a couple years ago. The original Jerry's head didnt work very well, the exhaust ports/valves were too big.

If your budget won't allow for an aftermarket head, in my opinion your best bet is to stick with what you have. Unless you spend a bunch of money on a cyclone head to weld in the eyebrow area, I dont think you will gain enough with different valves and port work to make it worth your while.

4010 puller · Mar 31, 2009

Will a head off of a 49-52 model fit and do they flow any better?

Thanks

Drew · Mar 31, 2009

Yes, the later heads will bolt right on. If you have cut a bunch off off your A2325R head, you pretty much have the equivilant of the later heads anyway and wont see any gain.

Anonymous-0 · Apr 1, 2009

Is this the new head that was available in late February?What dictated how much power you gained?Was it a gear shift,or the dyno?

Drew · Apr 1, 2009

The website hasnt been updated yet, but those heads are done and are available.

Power gain was measured on a dyno. Only got a couple dyno pulls with that head on before it tore the PTO up.

1941 JD A head

4010 puller

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JLO

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4010 puller

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Drew

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4010 puller

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Anonymous-0

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Drew

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