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03-18-2020, 04:26 AM | #1 |
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Join Date: Mar 2020
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Gasket for B block with Thomas Head
Hi
Manged to blow a gasket on my 1928 A on sunday. The car has a B block with a Thomas head. I have been reading here about what gaskets to use, but I was wondering what the latest views were. Interestingly, when I bought the car it came with a few head gaskets, including 3 Fel Pro ones. These are the composite (not copper B pattern). They are new and a good option as I have them. I also have 3 period made Payne gaskets. These are copper with proper asbestos in them. What are peoples thoughts on what to use? Much appreciated |
03-18-2020, 05:35 AM | #2 |
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Join Date: May 2010
Location: Southern California
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Re: Gasket for B block with Thomas Head
Use the Model B gasket as it will more closely follow the combustion chamber. It will also cover and seal the two two steam holes at the center of the engine.
Charlie Stephens |
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03-18-2020, 06:08 AM | #3 |
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Re: Gasket for B block with Thomas Head
thanks Charlie. Both are Model B gaskets. I was also wondering if there was a better modern offering. The one that failed was a composite one which was black with some red plastic mixed in certain places. This could have been a Snider one. Not sure though. It blew between 3 and 4. I think it had been in there for years. I had read that the Snider ones should be avoided
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03-18-2020, 07:21 AM | #4 |
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Join Date: Dec 2019
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Re: Gasket for B block with Thomas Head
The gasket you do you needs to match the head,not the block.
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03-18-2020, 11:58 AM | #5 | |
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Join Date: Aug 2015
Location: Southern Alberta
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Re: Gasket for B block with Thomas Head
Quote:
I just did this aswell, and I did use the one sniders recommends. however knowin peoples are having them blow I liberally sprayed mine with copper coat time will tell I guess I do not know what the best one to use would be |
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03-18-2020, 12:14 PM | #6 |
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Re: Gasket for B block with Thomas Head
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03-18-2020, 01:13 PM | #7 |
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Join Date: May 2016
Location: Scottsdale, Arizona
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Re: Gasket for B block with Thomas Head
Good Morning...A Model 'A' head should be torqued once a year. After changing the head gasket, you do need to re-torque after a few miles and then after 100 miles or so. Many a gasket failed because the head had become loose. With more compression, this re-torqueing becomes more important...I normally do it with the engine stone cold.Ernie in Arizona
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03-18-2020, 03:12 PM | #8 |
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Location: Wa.
Posts: 5,409
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Re: Gasket for B block with Thomas Head
The most important thing is, the fire ring must NOT hang over ANY amount on either the head or the block. I used the copper gasket. 10.5 compression ratio. I had to do some welding on the head to correct it but I was filling the chamber completely so it was no big deal. I use aluminum spray paint for glue.
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03-18-2020, 05:41 PM | #9 | |
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Re: Gasket for B block with Thomas Head
Quote:
Charlie Stephens |
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03-19-2020, 05:35 AM | #10 |
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Join Date: Mar 2020
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Re: Gasket for B block with Thomas Head
Thanks for all the replies so far
My Thomas head has steam holes! |
03-20-2020, 01:58 PM | #11 |
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Re: Gasket for B block with Thomas Head
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03-20-2020, 02:30 PM | #12 |
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Join Date: May 2010
Location: Southern California
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Re: Gasket for B block with Thomas Head
My original Thomas head lacks the steam holes.
Charlie Stephens |
03-20-2020, 03:12 PM | #13 |
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Re: Gasket for B block with Thomas Head
Just curious, why does my original Thomas head chamber look different than yours?
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03-21-2020, 01:00 PM | #14 |
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Location: Temecula, CA
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Re: Gasket for B block with Thomas Head
Pete, Charlie's chamber looks more like the original than yours, which looks to me like maybe a Dan Price revision, and is a better design.
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03-21-2020, 01:00 PM | #15 |
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Re: Gasket for B block with Thomas Head
because its lower comp
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03-21-2020, 02:45 PM | #16 |
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Re: Gasket for B block with Thomas Head
[QUOTE=Jim Brierley;1864530]Pete, Charlie's chamber looks more like the original than yours, which looks to me like maybe a Dan Price revision, and is a better design.[/QUOTE
Could be, I don't remember where I got that pic. It was just labeled "Orig Thomas". The design that Dan recommended for racing involved filling the chamber completely with weld and machining it to look exactly like an Edelbrock head for a V8. Worked pretty well. I had one at Riverside. |
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