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Old 09-14-2021, 01:56 AM   #21
Brian
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Default Re: 21 study cylinder head differences

Brian, have you done a compression test to see if there's much difference in the average from one side to the other?

Yes Adam, I did so today...both sides even at 95 psi. so, combustion chambers, whilst different configurations, would appear to be very close in cc's
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Old 09-14-2021, 10:46 AM   #22
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Default Re: 21 study cylinder head differences

Has anyone angle milled either head to reduce the CC volume, on a 24 stud 59a head it is suggested that a 1pt increase can be achieved, your thoughts?
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Old 09-14-2021, 01:34 PM   #23
Adam/Mill Valley CA
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Default Re: 21 study cylinder head differences

Brian thanks for posting that info, very good to know

Adam
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Old 09-14-2021, 06:25 PM   #24
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Default Re: 21 study cylinder head differences

21 stud with flat top pistons ,I run a dome type head on one side with a flat top on the other side like the top picture .I did a rough comparison cc with saw dust it didn't seem to be any difference any way the car runs smooth and strong .Unconventional yes , Hey thats just me always
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Old 09-15-2021, 08:13 AM   #25
Adam/Mill Valley CA
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Default Re: 21 study cylinder head differences

FlatheadTed, also interesting to hear that; reinforces the notion that these aren’t particularly fussy motors unless you’re looking for big horsepower gains

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Old 09-15-2021, 06:14 PM   #26
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Default Re: 21 study cylinder head differences

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To true Adam , I did balance all the rods etc on the kitchen scales though .
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