Mystery Head

Milton

Milton

Well-known member
I recently removed the head from an H&H "Touring" engine and immediately noticed that it was not a modified stock A head. I thought it looked like a Brumfield but couldn't find any indication of a B-F having ever been on it. Does anyone have an idea what kind it could be. The chambers are approximately 150cc.
 

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How is a high compression head identified if one is found at a swapmeet?

And this may a dumb question, but why can't a standard head be shaved a bit?
 
The heart shaped combustion chamber means it's a HC head patterned after the original "B" Police head. The standard head can be shaved--as much as 1/8 inch, but there are things you need to watch like piston clearance. It's also true that breathing can make more difference than compression ratio.
 
BCCHOPIT:
I will not bad mouth but, suffice to say, I am not on good terms with H&H.

P.S. Nice header & intake work, very nice.
 
TinCup said:
How would you measure a head to determined if it had been shaved?
Click to expand...

Seal a piece of glass against the gasket surface then fill the cavity through the spark plug hole with a measured amount of water is one way. Of course, one must know the volume of a perfectly stock cavity to have something to compare it to.
Terry
 
TinCup said:
How would you measure a head to determined if it had been shaved?
Click to expand...

Measure or mike the thickness at a head stud boss and compare with a known stock head measured in the same area. When this question was asked in the past some one gave the dimension of a stock head at the tall portion (water outlet) but I didn't write it down. Hopefully that kind person will offer the info again.
 
Last edited:
Milton said:
I recently removed the head from an H&H "Touring" engine and immediately noticed that it was not a modified stock A head. I thought it looked like a Brumfield but couldn't find any indication of a B-F having ever been on it. Does anyone have an idea what kind it could be. The chambers are approximately 150cc.
Click to expand...


That is without question one of Snyder's heads, 5.5.
 
Thanks Larry, mystery solved. I was really hoping it was yours at 5.9:1. I guess I get to go shopping for a cast iron 6 or 7 to 1 now. Any recommendations?

A pleasure to make your acquaintance.
 
TinCup said:
How would you measure a head to determined if it had been shaved?
Click to expand...

If you are talking about a stock head look at the depth of the clearance cut for the piston. I think it started at about .100 but have not measured it. Excellent visual to have in mind when shopping for a stock head.

Charlie Stephens
 
pooch said:
How is a high compression head identified if one is found at a swapmeet?

And this may a dumb question, but why can't a standard head be shaved a bit?
Click to expand...

Look at a stock head and then a high compression head. The combustion chamber will come to more of a point (looking at the surface where the gasket is located) and the volume will be less. You can mill a stock head a little but when you do some areas will become too thin. When you mill a stock head too much you also need to watch the piston clearance.

Charlie Stephens
 
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