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Old 10-19-2003, 09:58 PM
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454 compression dilema 10.1 or 11.1 what is your opinion

I am in the process of building my bbc. I have my heads done now. They are 049s and the one chamber I measured is around 100cc's. I have flattops for the engine now. I plan on having the deck milled so I should be around 10.1. My question is ( after reading about quench and flame travel and such) would it be worth using domed pistons to get the extra point of compression or should I stick with the flattops. I am going to be running propane and occasionally gasoline. The engine is going into an 1980 p/u 4x with 3.73 gears and eventually a 700 in place of the 400 trans.

I would appreciate any and all info

John
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Old 10-19-2003, 10:02 PM
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I`d stick to the 10:1, since gasoline will be run on occasion, propane can handle higher compression than gasoline, but to stay safe, i wouldn`t go over that.
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Old 10-19-2003, 10:20 PM
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No dome pistons will decrease airflow in the combustion chamber. You will make more power and be more efficient with a flat top piston. Domes are an airflow obstruction.
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Old 10-20-2003, 11:24 PM
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Thanks guys. I mocked up my engine today and measured how far down my pistons were looks like I will need to mill the block about 25 thousandths to get a zero deck. (Is that gonna screw up the intake alignment ?) I think I will stick to the flattops. It will save me money too. Thanks for the input.

John
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