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Old 02-25-2012, 03:35 PM
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compresion and head questions

Does porting and having head work lower or raise compression

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Old 02-25-2012, 03:53 PM
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As far as the heads go, only work done removing material from the combustion chamber itself or shaving the heads flat surface will change the compression ration. Adding (dome) or removing (dish) material to the piston head, dropping or raising the deck height of the piston, head gasket thickness and boring will change static compression ration as well.
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Old 02-25-2012, 03:56 PM
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Quote:
Originally Posted by swanson1930
Does porting and having head work lower or raise compression
If you remove material from the chambers you will lower compression. Remove material from the ports, no change. After the chambers are all brought to equal size (cc ing) the heads are milled to bring the compression to the desired compression ratio.
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