Compression ratio
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From: deland,florida
If the OP is hand porting the heads, it is not likely that the chamber volumes will be equal. JMHO but seems to me the OP sends his ported heads to the machinist and the machinist will have to equalize the chamber volume, and deck heads as required to produce the target CR with a .030" head gasket. I don't know what the OPs head porting bona fides are, no disrespect intended, but he might be better off just sending his heads to a competent porter with instructions.
Can't agree more
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Joined: May 2016
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From: Santa Maria
If the OP is hand porting the heads, it is not likely that the chamber volumes will be equal. JMHO but seems to me the OP sends his ported heads to the machinist and the machinist will have to equalize the chamber volume, and deck heads as required to produce the target CR with a .030" head gasket. I don't know what the OPs head porting bona fides are, no disrespect intended, but he might be better off just sending his heads to a competent porter with instructions.
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From: san antonio
Easy to interpret this the other way but thanks for straightening me out. So, that brings me back to the original question of why you and the head porter can't figure this one out. If you want to use a .030" head gasket to tighten up the squish band which, IMHO, is a more important reason than setting compression, you tell the head porter you want to use a .030" head gasket, land on a target compression rate and let the porter go to work to deliver.
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