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Old 12-26-2017, 04:37 PM   #1
chambies
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Default Thomas head marked 8???
Does this seem right? I got this Thomas head with a bunch of model a parts... I am concidering putting it on my ‘31 roadster project. Does this number mean it’s 8:1 compression? Any help greatly appreciated
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Old 12-26-2017, 05:31 PM   #2
BILL WILLIAMSON
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Default Re: Thomas head marked 8???
"Maybe" Employee# 8 poured the metal???
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Old 12-26-2017, 05:58 PM   #3
G Baese
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Default Re: Thomas head marked 8???
Photos of the chamber might be informative...
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Old 12-26-2017, 06:05 PM   #4
Charlie Stephens
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Default Re: Thomas head marked 8???
How about a picture of the combustion chamber? Maybe "8" was the inspector's stamp. Attached is photo you might enjoy, unfortunately it is not my engine.

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Old 12-26-2017, 07:17 PM   #5
Jim Brierley
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Default Re: Thomas head marked 8???
Good looking engine, air scoops on backward.
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Old 12-26-2017, 08:10 PM   #6
chambies
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Here is a pic of combustion chamber, I did find on Model A Ford garage a cc to compression ratio graph.
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Old 12-26-2017, 08:22 PM   #7
glenn in camino
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Default Re: Thomas head marked 8???
My Thomas head is a 7-1. I don't think there is an 8-1 Thomas. But maybe????
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Old 12-27-2017, 09:23 AM   #8
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Default Re: Thomas head marked 8???
Probably the 8th casting in that batch of pours. My super Winfield is stamped 108, for 108th casting.
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Old 12-27-2017, 02:03 PM   #9
hardtimes
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Default Re: Thomas head marked 8???
Quote:
Originally Posted by chambies View Post
Here is a pic of combustion chamber, I did find on Model A Ford garage a cc to compression ratio graph.
I'm guessing 6.1 cr, from pictures of chamber.
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Old 12-27-2017, 03:31 PM   #10
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Default Re: Thomas head marked 8???
That's different from the Thomas head I have. Completely different chambers and the plugs are on the edge of the bores on mine. Not sure if I have any photos.
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Old 12-28-2017, 12:08 PM   #11
chambies
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Default Re: Thomas head marked 8???
Well, I checked cc’s yesterday with Home made tools. Got approx 160cc, no head gasket. Will need to compare to graph. The bore is .060 over. Spark plug hole are 14 mm, this head was sitting in a storage locker for past 30 years.
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