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Old 06-26-2021, 06:36 PM   #1
Nick in Fayetteville
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Default Compression

What is the compression ratio on the Model A "B" head. This is the police head. Some say 5.0 to 1, others tell me that it is 5.5 to 1. What's your thoughts. Thank you.
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Old 06-26-2021, 08:14 PM   #2
Patrick L.
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Default Re: Compression

I believe the standard 'A' is 4.2 and the 'B' or police head is 4.8.

If I'm wrong we'll know soon enough. [ smiley face]
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Old 06-26-2021, 08:57 PM   #3
Doug Linden
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Default Re: Compression

Model A "B" Police head has CR of 5.2
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Old 06-26-2021, 11:39 PM   #4
Chuck Sea/Tac
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Default Re: Compression

5.2 is correct. I’m guessing 65# most important is they’re within 5# or so of each other.
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Old 06-27-2021, 12:40 PM   #5
Patrick L.
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Default Re: Compression

http://www.fordgarage.com/pages/head...ssionratio.htm
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Old 06-27-2021, 01:36 PM   #6
Nick in Fayetteville
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Thanks Guys, I researched more and found that 5.2 is correct. Thanks for your help. Have a happy "A" day.....Nick
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