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Help ID aluminum high compression head

Posted: Tue Jul 16, 2019 12:05 pm
by Alex Dragone
I picked up this head recently with a bunch of parts, can anyone identify what this is? Who made it? The chambers look like a Z head. I may sell this in the classifieds. It’s brand new, never used. Any help is appreciated. Thanks!

Re: Help ID aluminum high compression head

Posted: Tue Jul 16, 2019 1:28 pm
by RajoRacer
"R" could be for a Rader head - is it a low or high - if low, I'd be interested.

Re: Help ID aluminum high compression head

Posted: Tue Jul 16, 2019 1:39 pm
by Kohnke Rebabbitting
It is not one of R. G's heads. It is a z head.

Herm.

Re: Help ID aluminum high compression head

Posted: Tue Jul 16, 2019 3:58 pm
by RajoRacer
How ya doin' Herm ? I believe the "Z" heads had the Z up there, didn't they ?

Re: Help ID aluminum high compression head

Posted: Tue Jul 16, 2019 5:04 pm
by John.Zibell
RajoRacer wrote:
Tue Jul 16, 2019 3:58 pm
How ya doin' Herm ? I believe the "Z" heads had the Z up there, didn't they ?

I have a Z head on my car. There is a Z by the water outlet, not an R.

Re: Help ID aluminum high compression head

Posted: Tue Jul 16, 2019 5:26 pm
by Philip
I see some crude casting lines that my z head doesn't have plus the bolt holes look counted
Bored and lastly z I say it ain't a z head. Philip

Re: Help ID aluminum high compression head

Posted: Tue Jul 16, 2019 5:38 pm
by RajoRacer
Is it a high or low head, Alex ? Let's see a photo from the front, please.

Re: Help ID aluminum high compression head

Posted: Tue Jul 16, 2019 7:16 pm
by Alex Dragone
It’s a high head. I can post more pictures tomorrow. It came from an old collector and I think this was purchased some time ago. It’s a nicely made head.

Re: Help ID aluminum high compression head

Posted: Tue Jul 16, 2019 7:19 pm
by Allan
My low Reeder head had the same redundant oblong hole between cylinders 2 and 3. It also had 'Reeder' cast inside the water outlet.

Allan from down under.

Re: Help ID aluminum high compression head

Posted: Tue Jul 16, 2019 7:23 pm
by RajoRacer
Thanks for the reply, Alex !

Re: Help ID aluminum high compression head

Posted: Tue Jul 16, 2019 10:13 pm
by Joss
I have an older Z head with no Z id. Agree Reeder heads all said Reeder.

Re: Help ID aluminum high compression head

Posted: Wed Jul 17, 2019 9:23 am
by Mark Gregush
I am thinking someone cut up and used a stock head as a pattern. The chambers were built up and modified to what they wanted and used to make the mold. The lines running across it may be were it was cut apart. If you have a spare block you might do a trial fit first. The maker may not have taken into account for shrinkage. (One would hope they did if they got this far) You might also check how much water it holds compared to stock head. Block off the water outlet and flip over setting them level and fill both. See if it has about the same capacity as stock.

Re: Help ID aluminum high compression head

Posted: Wed Jul 17, 2019 10:51 am
by MWalker
The Reeder heads have a "4" on the water outlet, and they don't have the "Z head/Haibe" shape to the combustion chamber. Their combustion chambers are shaped like the Ford ones, only shallower. And yes, they said "Reeder" inside the water outlet. I don't know what this "R" head is.

Re: Help ID aluminum high compression head

Posted: Wed Jul 17, 2019 12:53 pm
by Dave S
The head is identical to the one that was on our Coupelet that is now in the Piquette Museum. It was driven many miles with excellent results. It is a Jensen head, made by Rod Jensen in Chicopee Falls, Mass. It was advertised in the Vintage Ford magazine in the 60's.

Re: Help ID aluminum high compression head

Posted: Wed Jul 17, 2019 2:00 pm
by Ruxstel24
I have a Jensen head on my 24 touring.
I have to look at the casting marks, but my head does not have the "groove" cut into the combustion chamber, it's straight across. The Z head combustion chamber looks more like the OP's, and should be 6:1.
Kevin Prus told me, the head on my car is THE head he used to make his mold for the 8:1 Prus head.

Re: Help ID aluminum high compression head

Posted: Wed Jul 17, 2019 2:04 pm
by Ruxstel24
This was before I cleaned it, you can see the combustion chamber is not the same.
Sorry, not a great picture.

Re: Help ID aluminum high compression head

Posted: Wed Jul 17, 2019 10:17 pm
by Kohnke Rebabbitting
R. G's heads are flat on the inside, are all the same depth, from one end to the other. They will " PING ".

The Z head is built like the Waukesha, and Hebbie High Power.

Herm.

Re: Help ID aluminum high compression head

Posted: Tue Aug 20, 2019 11:49 am
by Alex Dragone
Guys, I found out by looking on the box that this came in that this head was made by Rod Jensen of Massachusetts in the late 1970s. I have been told that the combustion chambers are basically identical to the modern Z heads that are offered today. This head is a low style head and has the Ford script. The modern Z heads offered are only high style and have no Ford script, so this is a pretty nice head. I just posted it in the classifieds if anyone is interested. Thanks for all the help.

Re: Help ID aluminum high compression head

Posted: Tue Aug 20, 2019 1:39 pm
by Ruxstel24
I agree with the combustion chamber looks like a Z head...
Funny, my Jensen head looks identical on the top, but the chamber does not have the V shaped notch. (See pics above). Supposed to be 8:1....

Re: Help ID aluminum high compression head

Posted: Wed Aug 21, 2019 2:13 am
by Piewagon
Has anyone posted the amount of compression (measured in lbs) that the Z head produces or the amount of compression that the Prus head produces.? Just wondering.