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Farmall & IHC Tractors Discussion Board

Re: m head swap


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Posted by James Rumph on February 14, 2010 at 06:14:01 from (24.192.125.175):

In Reply to: m head swap posted by lee. s on February 13, 2010 at 20:42:41:


It all depends on the combustion chamber size of the given head. I don't think you will see any real gains with a stock 400 gas head.

When you go up to the 450 gas and LP you see the big gains based on their smaller chambers.


Now if you have the 400 head cut then you will pick up some power.

I have had and seen "M" based heads cut .125 and in my opnion this is to much. All sorts of other problems come with this.

Do a nice .060 cut and be safe. With the .125 your putting spacers under the rocker pedstals to get the correct adjustment back in the rockers.

I had a 8060 that "was" cut .125 and it developed cracks in the corners of the combustion chambers that were not their before.

Get a fresh cut and a good valve job and it will run great.

Just my thoughts and advice .


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