Farmall h head

Brady Miller · Jan 4, 2014

I have a 42 h with the head casting number of 8776da. I need
another head due to cracks. What is the difference in the
casting numbers and what does that have to do with
horsepower etc.?

I also have a cracked piston that needs replaced. I've heard
that standard practice is not to mix and match?

Where's the best deal on a head?

This tractor is standard bore flat top pistons.

Thanks

pete 23 · Jan 4, 2014

I don't have the head numbers here so can't tell you which head you have. Three were available. Kerosene, Distillate and Gasoline. The difference is in the depth of the combustion chamber and thus valve length. Shallow head, longest valve is gasoline head. You can check valve numbers and refer to online parts book at CASEIH website and determine which head you have.

As far as piston, you would need to find same size, weight, same pin hole diameter. Can be done.

rustyfarmall · Jan 4, 2014

(quoted from post at 12:38:33 01/04/14) I have a 42 h with the head casting number of 8776da. I need
another head due to cracks. What is the difference in the
casting numbers and what does that have to do with
horsepower etc.?

I also have a cracked piston that needs replaced. I've heard
that standard practice is not to mix and match?

Where's the best deal on a head?

This tractor is standard bore flat top pistons.

Thanks

8776 is distillate
6186 is kerosene
8043 is high compression gasoline.

All 3 will interchange.
The 8043 will be priced higher because of the potential increased performance, and the 8776 will probably be the easiest to find.

Charlie M · Jan 4, 2014

For those of us wanting to learn what would be the difference between the heads? I'm assuming they affect compression but the question is how?

pete 23 · Jan 4, 2014

The compression is affected due to the size of the combustion chamber. Higher comp head has shallower chamber,(smaller) thus higher ratio equals more compression equals more horse power, all other things being equal.

GordoSD · Jan 4, 2014

How bad are the cracks. There is a place in IA that spray welds them and warrantees them Mustang?
All States Ag parts usually has one on hand and you bring in your core.
They have yards in WI, IA, SD, NE MN

Charlie M · Jan 4, 2014

So if one could only find a lower compression head can it be milled down to equal a higher compression head? What kind of increase in horsepower does it make. I'm trying to understand the different heads as my H has a cracked head. Its cracked away from a cylinder and I've been able to seal it from leaking but I'm sure there will be a day it will have to be changed.

D Slater · Jan 4, 2014

8776DA is late enough in 1942 to have the same size manifold attaching studs as later models.
Unless you care about original a gasoline model head would be best if purchasing one anyway. Look for a 8043DA, DC, DD or 362533R1. If you don't mind changing the vent line from the head rear to the air inlet a 300, 350 head will work with the matching valve cover. Off the top of my head I think that's number 361479R1.
Only problem that you may have purchasing a reconditioned head is some want a core charge or the old head. If wanting another number head they may not take yours for a core. Some may not take it anyway, depends on what's wrong with the head or who the seller is.

pete 23 · Jan 4, 2014

You cannot machine a head no where near that much as we are looking at a nearly a half inch or so difference between the higher compression head and the lowest kerosene head. With all the H tractors around, I think you can come up with a gasoline head. You can put high alt pistons in with a low comp head and get up to compression ratio of gasoline head and flat head pistons but the head is still the best way to go.

Farmall h head

Brady Miller

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pete 23

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rustyfarmall

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Charlie M

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pete 23

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GordoSD

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Charlie M

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D Slater

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pete 23

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