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Tractor Pulling Discussion Forum

Pistons for lp head

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01-21-2020 16:05:10

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I bought a new lp head for my 44 M. When I took the old head off I found fire crater pistons. Will they work with the new head or will there be other issues because of too high of compression?

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01-26-2020 13:41:18

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 Re: Pistons for lp head in reply to Farmallhm44, 01-21-2020 16:05:10  
I just put an lp head on my 400 with 281cid fire craters. It has 220# cranking pressure. It also has murphys roller rockers. We are going to put it on the dyno in the spring and tune it. Running 100ll fuel in it right now.

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01-22-2020 19:03:23

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 Re: Pistons for lp head in reply to Farmallhm44, 01-21-2020 16:05:10  
Biggest issue with higher compression is need for higher octane fuel to prevent pre detonation. After getting the engine together, check compression. 200# and under should run fine on premium pump gas with maybe some octane booster. Over 200# may take some experimenting with blending some higher octane fuel or running higher octane to avoid pre detonation.

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01-22-2020 06:48:52

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 Re: Pistons for lp head in reply to Farmallhm44, 01-21-2020 16:05:10  
flat top pistons will get you 223 static, firecraters 197 that says everything you really need to know . flattops will yield about 70 hp if tuned correctly

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