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Old 05-26-2010, 04:06 PM   #1
firerod
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Default High compression heads?

I have a stock engine that I would like to put a new head on. I was going to go with the Snyder 6:1 head but now they are saying 6-8 weeks. What are your opinions on a Winfield, Lion Speed, or Thomas? My piston does not come above the block if this helps. In the future I may also run a single down draft.
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Old 05-26-2010, 04:10 PM   #2
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Default Re: High compression heads?

I run an early Lion Head, It has power and no mechanical problems. I think the others you mentioned are good too. I prefer cast iron!
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Old 05-26-2010, 04:19 PM   #3
Dusty
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Default Re: High compression heads?

I run the 5.5:1 from Snyders and have been very pleased with the increased perfomance.
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Old 05-26-2010, 05:24 PM   #4
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Default Re: High compression heads?

What sort of cranking pressure do you get with the 5.5 head.
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Old 05-26-2010, 05:40 PM   #5
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Default Re: High compression heads?

Quote:
Originally Posted by Lawrie View Post
What sort of cranking pressure do you get with the 5.5 head.
Lawrie
Sorry, I can’t answer that question; however the increased performance was very apparent. Also I have put over 1500 miles on this head with no problems…just fun driving.
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Old 05-26-2010, 08:10 PM   #6
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Default Re: High compression heads?

Just curious, what head gasket did you go with?
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Old 05-26-2010, 09:04 PM   #7
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Default Re: High compression heads?

Quote:
Originally Posted by Kevin - Illinois View Post
Just curious, what head gasket did you go with?
I used the gasket Snyders recommended for their head.

This is from Snyder's website:

"The 1932-34 model B version gasket is recommended with all 1932-34 stock heads as well as 1928-31 5.5:1 Snyder brand high compression head."

part number:B-6051-M

I torque the head to 55# and had to re-torque it several times after that. After it settled to 55# I torque to 60# and did it three times for it to finally settle in at 60#.
No sign of a leak anywhere and it is running great.

Last edited by Dusty; 05-26-2010 at 09:11 PM.
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Old 05-26-2010, 09:13 PM   #8
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Default Re: High compression heads?

I picked up Thomas... It runs mint



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Old 05-26-2010, 11:48 PM   #9
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Default Re: High compression heads?

I also have a Snyder 5.5 head....almost 4 years old, about 5,500 miles on it. Very noticeable performance increase, especially with my heavier Town Sedan. If it is important to you, the Snyder heads looks totally stock, and lots of satisfied users out there. Works really well when coupled with the Mitchell overdrive!
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Old 05-27-2010, 07:06 AM   #10
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Default Re: High compression heads?

Quote:
Originally Posted by BCCHOPIT@AOL.COM View Post
I picked up Thomas... It runs mint



What kind of carb and distributor is that in the top picture ?

SC Frank
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Old 05-27-2010, 08:05 AM   #11
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Default Re: High compression heads?

I have been using Snyder's 5.5 heads on the three cars that I drive since the heads became available. At first, I was using the copper gaskets but have changed to the newer style as recommended by Snyder. The heads have been a great change, not just for power, but primarily for fuel economy. Don't ask how long the break even time will be!

I was using Brumfield's prior to the Snyder's heads and I was not able to keep the heads from warping and leaking.
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Old 05-27-2010, 09:30 AM   #12
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Default Re: High compression heads?

i run a 5.5 snyder head with 0.050 milled off . works great . .............. steve
i get 85# on all .................
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Old 05-27-2010, 09:35 AM   #13
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Default Re: High compression heads?

I really like the looks of the Thomas head. I read that the cable won't screw into the dist., what do you do about this?
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Old 05-27-2010, 09:38 AM   #14
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Default Re: High compression heads?

I'm a fan of the Thomas head, but mine has what appears to be a Brumfield profile. Runs great. The carbs need just little more tuning but I like the power that it puts out!







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Old 05-27-2010, 09:40 AM   #15
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Default Re: High compression heads?

Quote:
Originally Posted by firerod View Post
I really like the looks of the Thomas head. I read that the cable won't screw into the dist., what do you do about this?
Just had to file down one of the fins for the pop out cable spring coil thing
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Old 05-27-2010, 10:49 AM   #16
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Default Re: High compression heads?

On one of my cars, '31 SW TS, I'm running a Snyder's 5.5 milled .100 which probably gets it up to 6 to 1 or maybe a little higher. Works great. On this engine, like yours, the pistons don't protrude above the block - something to be aware of before milling. So, I'm saying, you don't have to wait for the Snyder's 6.0 head. BTW, I've used "B" head gaskets for many years. On this one I'm using the "modern" silicone impregnated "B" gasket. It's been a couple years and probably about 7,000 miles - no problem.
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Old 05-27-2010, 11:13 AM   #17
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Default Re: High compression heads?

I have the snyder 5.5 head on two of my cars, a "model A speed head" on another, an original winfield 6-1 head on another, and a stock head on the last. The snyder head is good value, looks stock, and makes a big difference climbling hills. The "model A speed head is 6-1, and that really goes good.
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Old 05-27-2010, 12:25 PM   #18
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Default Re: High compression heads?

Larry, that is a thought of milling the Snyder head .100. Has anyone else out there had luck milling the Snyder head?
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Old 05-27-2010, 04:43 PM   #19
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Default Re: High compression heads?

Quote:
Originally Posted by Special Coupe Frank View Post
What kind of carb and distributor is that in the top picture ?

SC Frank

Willys/Jeep dist. and a Winfield carb and intake
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Old 05-27-2010, 04:58 PM   #20
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Default Re: High compression heads?

Quote:
Originally Posted by 2manycars View Post
I have the snyder 5.5 head on two of my cars, a "model A speed head" on another, an original winfield 6-1 head on another, and a stock head on the last. The snyder head is good value, looks stock, and makes a big difference climbling hills. The "model A speed head is 6-1, and that really goes good.
Can you give us an evaluation of the Winfield head also, please?
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Old 05-27-2010, 05:31 PM   #21
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Default French dual spark plug head

At Rétromobile in Paris, France last year I saw this rather interesting Model A head. It was made by the "Etablisement Veyet", Lyon, France.


What does the extra set of spark plugs do? I believe it might have been an attempt to squeeze a little more power out of the smaller AF engine that it is mounted on.

The engine is located in central France. His asking price for the entire engine as pictured is 1500 Euro ($1875.-) and he does not know what the condition of the engine is....

Fordially,
Brad
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Old 05-28-2010, 05:09 PM   #22
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Default Re: High compression heads?

Bassman,

I'm running a Winfield head, and have been very pleased with the performance and reliabilty.

Cheers
Bick
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Old 05-28-2010, 05:13 PM   #23
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Default Re: French dual spark plug head

Brad - My guess would be that the engine you are looking at was either originally a fancy speed (they have been made with dual spark plugs for speed. Look at the modern Lion Head)

OR an airplane engine head. redundancy is nice to have in the air, and airplanes had two sets of magnetos. One electrical system goes out, switch over to the other and keep 'em flyin'

I also found this on a Harley website: Interesting Info:

Quote:
In 1917, Liberty Aircraft discovered that simply adding another spark plug to the opposite side of the combustion chamber and increasing the voltage at the plugs would cure detonation and increase power.
The same dual plugging solution was incorporated by Continental and Lycoming in the 1920s and 30s. Primarily used as a safety factor, it also reduced spark plug fouling and detonation and increased RPM..
For exactly the same reasons, your Harley motor can benefit from dual plugging. Dual plugging will “undo” the problems with its combustion chamber design and help your Harley run happily on unleaded gas.
Dual plugging alone of a stock motor will eliminate most detonation, stop plug fouling and hard starting, increase horsepower by five percent or more, increase gas mileage, double spark plug life, and lower emissions. Some tuners have reported six to eight percent increase in gas mileage.


Quote:
Originally Posted by Brad in Germany View Post
At Rétromobile in Paris, France last year I saw this rather interesting Model A head. It was made by the "Etablisement Veyet", Lyon, France.


What does the extra set of spark plugs do? I believe it might have been an attempt to squeeze a little more power out of the smaller AF engine that it is mounted on.

Fordially,
Brad
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Last edited by Jason in TX; 05-28-2010 at 05:31 PM.
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Old 05-28-2010, 05:54 PM   #24
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Default Re: High compression heads?

Quote:
Originally Posted by Elrod View Post
I'm a fan of the Thomas head, but mine has what appears to be a Brumfield profile. Runs great. The carbs need just little more tuning but I like the power that it puts out!
That appears to be an original Thomas head as opposed to a Dan Price reproduction.
Dan told me how to modify one of his heads to get 10 to 1 compression.
After welding the chamber up completely you machine it to look exactly like a flathead V8 Edelbrock head chamber.
I ended up with 11 to 1.
Here's a pic of the V8 chambers..The 4 bangers looks identical.
Attached Images
File Type: jpg Heads.jpg (10.2 KB, 140 views)
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Old 05-28-2010, 06:47 PM   #25
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Smile Re: High compression heads?

I just put on the Snyders 6:1 head with a touring cam. I can run 65 mph all day and not hear the motor run. Best money ever spent. I also run a 4 speed overdrive.
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Old 06-09-2010, 03:30 PM   #26
Larry Brumfield
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Default Re: High compression heads?

In reference to (#11) Aerocraft's comments above concerning a Brumfield Head, go to and please read my posts numbered 10 and 12 on the thread entitled RE: Rear End Noise Update, June 9, 2010. Thanks

Larry Brumfield
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Old 06-09-2010, 05:10 PM   #27
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Default Re: High compression heads?

Quote:
Originally Posted by Bick in New Zealand View Post
Bassman,

I'm running a Winfield head, and have been very pleased with the performance and reliabilty.

Cheers
Bick
Hi Bick,
Are you the owner of the coupe with 16's, and twin carbs etc?
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Old 06-09-2010, 05:16 PM   #28
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Default Re: High compression heads?

Larry, Nice to see you posting on the "Barn" again. Have missed your posts.
Paul in CT
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Old 06-09-2010, 05:38 PM   #29
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Default Re: French dual spark plug head

Quote:
Originally Posted by Brad in Germany View Post
At Rétromobile in Paris, France last year I saw this rather interesting Model A head. It was made by the "Etablisement Veyet", Lyon, France.


What does the extra set of spark plugs do? I believe it might have been an attempt to squeeze a little more power out of the smaller AF engine that it is mounted on.

The engine is located in central France. His asking price for the entire engine as pictured is 1500 Euro ($1875.-) and he does not know what the condition of the engine is....

Fordially,
Brad
I have dual plugs on my wife's "Hemi" engine. As far as I'm concern,"It squeezers more money out of my wallet" when I have to do a tune up.
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Old 06-09-2010, 10:50 PM   #30
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Default Re: High compression heads?

i have tested for compression on 3 different heads .
stock - 55#
5.5 - 75#
6.1 - 85#

hope this helps .......... steve
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Old 10-11-2018, 06:54 PM   #31
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Default Re: High compression heads?

Quote:
Originally Posted by Jason in TX View Post
I'm a fan of the Thomas head, but mine has what appears to be a Brumfield profile. Runs great. The carbs need just little more tuning but I like the power that it puts out!







Are they 94 Holleys and what jet cofigurations are you using. I have a Riley 2 port head and having trouble tuning them. I've been told that the power valves are the wrong size
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Old 10-11-2018, 07:05 PM   #32
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Default Re: High compression heads?

Quote:
Originally Posted by Lawrie View Post
What sort of cranking pressure do you get with the 5.5 head.
Lawrie
In my tourer, which you know, Lawrie, I get more than others here have said they get - high 90's. Very close to 100 psi in each. That's higher than I would have expected from 5.5:1 compression ratio but that's what it is! Bores are 60 over, FWIW.
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Old 10-11-2018, 07:40 PM   #33
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Default Re: High compression heads?

Quote:
Originally Posted by Niggled View Post
Are they 94 Holleys and what jet cofigurations are you using. I have a Riley 2 port head and having trouble tuning them. I've been told that the power valves are the wrong size
Those appear to be Stromberg's.
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Old 10-11-2018, 08:28 PM   #34
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Default Re: High compression heads?

Compression (PSI) / 14.7 = compression ratio. Good for rough estimate, no lab glassware needed.
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Old 10-12-2018, 12:11 AM   #35
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Quote:
Originally Posted by karsyn View Post
I just put on the Snyders 6:1 head with a touring cam. I can run 65 mph all day and not hear the motor run. Best money ever spent. I also run a 4 speed overdrive.
x2 with karsyn.
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Old 10-12-2018, 11:57 AM   #36
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Default Re: High compression heads?

Just a comment, the pics posted by Jason, niggled, etc. appears to be more like a Winfield chamber. The original Thomas tended to detonate, Winfields did not. On dual plug heads, I ran a big Hall-Scott (5 3/5" bore) on a chassis dyno years ago. They had dual plugs, one on the left side of the head (OHV) one on the right. Each bank was on a separate switch. At idle there was a difference in RPM when one bank was shut off, at full throttle there was no difference in power!
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Old 10-13-2018, 11:47 AM   #37
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Default Re: High compression heads?

Quote:
Originally Posted by Tom Foster View Post
Compression (PSI) / 14.7 = compression ratio. Good for rough estimate, no lab glassware needed.
Fearless
That would be a very rough estimate! Nowhere near accurate! Compression pressure is dependent on several variables such as when intake valve closes, cranking speed, engine temperature, and rate of leakdown.
Compression ratio, on the other hand, is based on two simple measurements: the volume of the combustion space with the piston at BDC, and then the combustion volume with the piston at TDC. Then simple division gives you the correct ratio.
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