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Tractor Pulling Discussion Forum

Need Advice!

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02-18-2004 05:21:40

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I have a 400 farmall, and the compression is in the 145-150 psi range on all four cylinders. The motor is stock 4.125x5.250 with a 180cc chamber head (362174). My question is can I put an lp head with the 140cc chamber on this motor and still run pump gas(89)? And what can I expect to see the compression go to, 180-190psi? I still use the tractor on the farm so I don't want to have to use high test fuel. What do you think?

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02-18-2004 06:27:43

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 Re: Need Advice! in reply to Joel, 02-18-2004 05:21:40  
The computer says your calculations are pretty close on 180 psi. I wouldn't think 89 octane would be safe. My opinion.

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