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Old 08-06-2020, 06:31 PM   #1
Wmurphy@whmcontractin
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Default 8rt head milling

Hey guys, I have a 51 8ba with a 4” crank, bored .060 over, and 8rt heads. I bought the heads at the same time but don’t know the history of them. I have 130-140 lbs of pressure in cylinders 1-4 and 110-120 lbs in cylinders 5-7. I did the tin foil balls thing in the cylinders on the 5-8 side and it seems to have .025 piston clearance with the head tightened down with no gasket. I’m thinking if I mill .020 off the head and use a copper gasket I should be around the .050 you guys talk about. Do you think that will get the right side to match the left side.
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Last edited by Wmurphy@whmcontractin; 08-07-2020 at 06:52 AM.
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Old 08-07-2020, 08:44 AM   #2
Ol' Ron
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Default Re: 8rt head milling

Find a set of EAB heads and mill them for .045 clearance. I have a set of them on my 280 engine and get 160lbs with EAB cam as well. Engine torque is unbelievable.
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Old 08-07-2020, 10:13 AM   #3
Wmurphy@whmcontractin
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Default Re: 8rt head milling

Thanks Ron, I guess there is a difference in the heads that just milling the 8rt heads won’t accomplish the same thing?
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