Identifying a high compression head I’ve seen high compression heads described as looking original. Is there an easy visual way to tell the various compression ratios and original heads apart on an installed engine?
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Re: Identifying a high compression head Probably the best way is to look at the combustion chamber - and compare it to an original Model A chamber. Different makers of HC heads have different chambers and one can get a sense of who made it from the hidden side.
My X-ray vision isn't what it used to be. https://stumptownblogger.typepad.com...5d3c1c9970c-pi I think my X-ray glasses are in the same box with the Sham-Wow wipers. Joe K |
Re: Identifying a high compression head Not with any accuracy. The combustion chamber must have its volume measured and figured mathematically for any accuracy.
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Re: Identifying a high compression head One thing I noticed is my 5.5 head from Snyder's is the H/C head physically smaller than an original.There was a thread that mentioned this a little while back. You do have to look close tho. Notice head gasket.
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Re: Identifying a high compression head All of the Snyder high compression heads I have seen have two round casting marks about the size of a dime. The photo in post #6 shows them, one on each side of a lug nut. The location varies with the different lots.
Tom Endy |
Re: Identifying a high compression head Do a compression test.
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Re: Identifying a high compression head The original police head had a heart shaped combustion chamber and a compression ratio of 5.2 . The Brumfield 5.9 compression head also has a heart shaped combustion chamber . Combustion chambers can vary in shapes and sizes with different heads . Most of the higher compression heads that I have seen use the heart shaped chamber .
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