Farmall M LP head

49MFarmall

New User
How much of a dome can I run on my pistons with an LP head on my Farmall M?

I'm running an 8060 head now and making about 75hp with about 180-190 lb of compression. How much of a difference will the LP head make?
 
you will go from 8.3 to 12.3 a big difference . head gasket may not hold 290-300 psi . murphy's gasket may .
9:1 ? 10:1 = 2.9% power increase

10:1 ? 11:1 = 2.5% power increase

11:1 ? 12:1 = 2.1% power increase

12:1 ? 13:1 = 1.9% power increase
 

Need to grind the cam to match the mechanical compression ratio if you want a power increase . Valve work, port cleanup and port matching.
 
steel o rings hold a lot more than that . the O rings go all around the valve chamber and cylinder without a break in a v groove ? what diameter is the wire ? I haven't seen that done except in racing engines and diesels .
 
The o-rings are steel and have very minimal gap where each one meet. Not sure on the diameter of the wire. They are completely around the cylinder. I'm running a 4 3/8" Arias piston. I was running a copper head gasket with the 8060 head and it really sealed well. My valve guides were leaking oil so I've decided to upgrade to an LP head.
 

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