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05-26-2010, 04:06 PM | #1 |
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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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05-26-2010, 04:10 PM | #2 |
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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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05-26-2010, 04:19 PM | #3 |
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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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05-26-2010, 05:24 PM | #4 |
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Re: High compression heads?
What sort of cranking pressure do you get with the 5.5 head.
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05-26-2010, 05:40 PM | #5 |
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Re: High compression heads?
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05-26-2010, 08:10 PM | #6 |
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Re: High compression heads?
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05-26-2010, 09:04 PM | #7 |
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Re: High compression heads?
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. |
05-26-2010, 09:13 PM | #8 |
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Re: High compression heads?
I picked up Thomas... It runs mint
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05-26-2010, 11:48 PM | #9 |
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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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05-27-2010, 07:06 AM | #10 | |
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Re: High compression heads?
Quote:
SC Frank |
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05-27-2010, 08:05 AM | #11 |
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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. |
05-27-2010, 09:30 AM | #12 |
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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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05-27-2010, 09:35 AM | #13 |
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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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05-27-2010, 09:38 AM | #14 |
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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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05-27-2010, 09:40 AM | #15 |
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Re: High compression heads?
Just had to file down one of the fins for the pop out cable spring coil thing
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05-27-2010, 10:49 AM | #16 |
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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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05-27-2010, 11:13 AM | #17 |
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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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05-27-2010, 12:25 PM | #18 |
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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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05-27-2010, 04:43 PM | #19 |
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Re: High compression heads?
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05-27-2010, 04:58 PM | #20 | |
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Re: High compression heads?
Quote:
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05-27-2010, 05:31 PM | #21 |
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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 |
05-28-2010, 05:09 PM | #22 |
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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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05-28-2010, 05:13 PM | #23 | ||
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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:
Quote:
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05-28-2010, 05:54 PM | #24 | |
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Re: High compression heads?
Quote:
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. |
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05-28-2010, 06:47 PM | #25 |
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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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06-09-2010, 03:30 PM | #26 |
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Re: High compression heads?
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06-09-2010, 05:10 PM | #27 |
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Re: High compression heads?
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06-09-2010, 05:16 PM | #28 |
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Re: High compression heads?
Larry, Nice to see you posting on the "Barn" again. Have missed your posts.
Paul in CT |
06-09-2010, 05:38 PM | #29 | |
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Re: French dual spark plug head
Quote:
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06-09-2010, 10:50 PM | #30 |
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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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10-11-2018, 06:54 PM | #31 |
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Re: High compression heads?
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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10-11-2018, 07:05 PM | #32 |
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Re: High compression heads?
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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10-11-2018, 07:40 PM | #33 |
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Re: High compression heads?
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10-11-2018, 08:28 PM | #34 |
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Re: High compression heads?
Compression (PSI) / 14.7 = compression ratio. Good for rough estimate, no lab glassware needed.
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10-12-2018, 12:11 AM | #35 |
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Re: High compression heads?
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10-12-2018, 11:57 AM | #36 |
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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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10-13-2018, 11:47 AM | #37 | |
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Re: High compression heads?
Quote:
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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