SNYDER'S High compression heads

[Bubby Sharp in KY]

Has anyone done a comparison of the 5.5 to 1 and the 6.1 to 1 Snyder's high compression heads . I have installed three 5.5 's for other people and they ran strong. They all had reground touring cams and .060 or less over bore otherwise stock newly rebuilt . I installed a 6.1 in my car , newly rebuilt engine which has the following modifications , .100 overbore , new stipe 330 cam, B carb. , bored out intake , oversize SS valves . My car runs strong but not really any stronger than the cars with the 5.5 . My question , is the 6.1 really any better than a 5.5 or mayby not as good a choise ? Looking at the compression chamber the 6.1 looks more like the stock head , while the 5.5 has a heart shaped chamber . Any experiance or opinions ? Bubby Sharp in KY

[Milton]

Here they are for your comparison. 5.5 on the left 6.1 on the right.

[Bubby Sharp in KY]

Thank's for posting Milton , now people can see what I was describing as to shape . Now what I need to know is Which preforms the best? I am speculating that due to the difference in chamber shape maybe the 5.5 may be as good as the 6.1 Bubby Sharp in KY

[msmaron]

Would be very interested to know the difference, i ordered the 5.5 from Rich Falluca for my new engine, he has been waiting a year for the 6 and hoping to get them in, He said they are a better head??? What that means i dont know

[Milton]

http://modelaparts.net/dynosheets.htm/dynosheets.html

I checked Piranios site above and found a stock A dyno run vs. the same engine with a Snyder head. The difference was about 10hp. Still looking for a 6.1 head test.

[oljoe001]

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I have a snyder's 6.1 on my motor with snyder's reground cam, lighten flywheel and balanced crank stock zenith (jets correctly sized) and mine runs a lot stronger than my friends who has a 5.5 head. Of course it could be a lot of reasons why. But more compression should result in more horse power. As to your concerns about the head chamber I don't think a model a motor turns enough rpms to be greatly affected by the difference in the head configuration that usually affects response and rpms not so much the power. just my opinion any.
Joe

[MikeK]

Originally Posted by Bubby Sharp in KY

Has anyone done a comparison of the 5.5 to 1 and the 6.1 to 1 Snyder's high compression heads . . . Bubby Sharp in KY

Yes, and it is right on Snyder's website. Done by Bill Stipe, stock A carb and his relatively mild IB330 cam. The 6.0 vs 5.5 gives about 5% more @ 2500 RPM. Here's the LINK

[Bubby Sharp in KY]

Thanks MikeK, That is what I was looking for. I am glad my friends cars run good also . After looking at some of the tests on Pirano's site I am tempted to put the downdraft manifold I have on my car! Bubby Sharp in KY PS does anyone on this site not have insomina ?

[Tom Wesenberg]

"PS does anyone on this site not have insomina ?"

I'm not sure...........I'll have to sleep on it!

[kenparker]

I am currently running a Snyder 6.1 head in my S/W. Had a Snyder 5.5 in it and had some extra cash one day so upgraded to the 6.1 for the extra HP that it might bring. I could not/can not tell the difference. This was not a scientific experiment, just seat of the pants experience.

Engine specs are Rich Faluca (sp) insert rods. 20/20 crandshaft counterbalanced. Babbit mains. .040 cyl bore. Reground cam to "B" spces. Oversize valves (modern guides). Downdraft Weber carb and manifold. Cast Iron Snyders exhaust header. Aries muffler.

ken

[Mikeinnj]

According to the Dyno report you should see about a whopping 2.8 horsepower increase. For me, not worth the money and time to upgrade from the 5.5 head....

[Jim Brierley]

Bobby, I would suggest that with all of your modifications, the limiting factor now is the carb. The B carb (or any carb) will only flow a certain amount, regardless of the cam, big valves, etc.

[BRENT in 10-uh-C]

Originally Posted by Mikeinnj

According to the Dyno report you should see about a whopping 2.8 horsepower increase. For me, not worth the money and time to upgrade from the 5.5 head....

I totally agree, ....BUT, when you consider what (relatively minor) modifications can be made to the 6.0 head as improvements, the whole perspective changes.


Jim B's. comment above this one is well worth re-reading!!


.

[CalMI]

I purchased a Snyder 6:1 head to put on an engine I built last winter. I decided to go one further. I machined 0.040 of the head. I think that will get me up to 6.5:1 comp ratio.
I haven't fired the engine yet but hope to this spring. Currently rebuilding the rear axle.
The rest of the mods. Full oil filtering, pressure to all mains, insert mains, Stipe 340 cam, Larger intake valves, 283 pistons, downdraft intake with 94 carb.
Why? Because I can. I love to work on engines.
Cal

[SteveB31]

When you read those DYNO results, you can see that the carburator makes more difference then the head. 8 HP more when changing to the Weber carb. Jim B. is 100% correct that the carb is the limiting factor.

[Benson]

Originally Posted by Milton

Here they are for your comparison. 5.5 on the left 6.1 on the right.

Milton,

Could you please measure and post the depth of the Flycut (counter bore) on the 5.5 head and 6.0 head.

Thanks

[Milton]

Originally Posted by Benson

Milton,

Could you please measure and post the depth of the Flycut (counter bore) on the 5.5 head and 6.0 head.

Thanks

I would if I could but, the 5.5 is installed, and I only have a picture of the 6.0, sorry.

[Benson]

Originally Posted by Milton

I would if I could but, the 5.5 is installed, and I only have a picture of the 6.0, sorry.

Thanks anyway. I was looking to compare the 5.5 and original 6.1 flycut to the re- engineered head when they are available.

[Tuumer]

Anybody has dyno sheets whit single carburator like Stromberg 97 or Holley 94?

[ABento]

In this configuration of head and cam what difference does or would dual Tillys make, or are they worth the bother.