Robert m Roof 16 valve head

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Shelbycsx
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Robert m Roof 16 valve head

Post by Shelbycsx » Sat Oct 31, 2020 2:54 pm

Does anyone know what year this model head was first starting to be produced? How many did they make?
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StanHowe
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Re: Robert m Roof 16 valve head

Post by StanHowe » Sat Oct 31, 2020 4:35 pm

John Steele has several of those 16 valve heads and reproduced the racing manifolds for them several years ago.

If you want his contact information email me at stanhowemt@aol.com and I will hook you up.

Also, you should sell me that Carburetor!!!!

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aDave
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Re: Robert m Roof 16 valve head

Post by aDave » Sat Oct 31, 2020 4:46 pm

Stan, you keep saying how many you have now...and how much work is ahead of you.....you'll have to live longer than Methuselah to finish all your projects! That pretty violinist of yours will not have time to do the carbs and play also! :D

I know....long winters up there....but still....

Be well.

Too much carb work, and there won't be time for another book.

Cheers,

Dave


StanHowe
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Re: Robert m Roof 16 valve head

Post by StanHowe » Sat Oct 31, 2020 4:51 pm

John is off hunting so I'll just tell you what little I know about it. That is an A head, the first of the Roof 16 valve heads. The intake manifold bolts to the side of the block, the exhaust to the side of the head.

It was replaced by the B, then the BB, then the C. The C is worth several times what the A or B is because it flows much better as the intake is also on the head.

Total of my knowledge right there.


David Mazza
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Re: Robert m Roof 16 valve head

Post by David Mazza » Sat Oct 31, 2020 4:54 pm

Short video of one running, sounds awesome, and powerful!

https://youtu.be/Ld3D-nEnSlY


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Re: Robert m Roof 16 valve head

Post by Kevin Pharis » Sat Oct 31, 2020 4:55 pm

This article states that Laurel began marketing the 16 valve heads in ‘17-‘18. It’s not specific enough to discuss when the various models were released tho...

http://www.coachbuilt.com/bui/l/laurel/laurel.htm


StanHowe
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Re: Robert m Roof 16 valve head

Post by StanHowe » Sat Oct 31, 2020 4:55 pm

David, I am not buying carbs much anymore. I bought a Master the other day because it had the correct original manifold for it. Hope to have it sold and paid for before Christmas, I am trying to round up money for a set of Sure Stop brakes for my coupe.

I'm gaining on the pile, cranking them out day by day. Been in the shop since about 10 this morning, headed back out in a few minutes.

Savanna is a Jr at Stanford. Not much time for fiddle playing but is playing in a couple Jam Session groups, one Bluegrass/Old Time and a Western Swing one.


StanHowe
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Re: Robert m Roof 16 valve head

Post by StanHowe » Sat Oct 31, 2020 5:01 pm

THAT IS JUST COOL!!!!! I HAD FORGOTTEN THAT MIKE ROBISON IN SPOKANE HAD A 16 VALVE (if I ever knew)


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Shelbycsx
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Re: Robert m Roof 16 valve head

Post by Shelbycsx » Sat Oct 31, 2020 5:23 pm

Is the master carb rare? What year did they make this model?


StanHowe
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Re: Robert m Roof 16 valve head

Post by StanHowe » Sat Oct 31, 2020 5:33 pm

Probably somewhere between "Rare" and "Not too common." I just bought a couple of them yesterday, have probably 4 or 5 of them on the shelf. They came in various sizes and were popular with the racing crowd. They are better for racers than for everyday driving. They came out in the late teens and were built up though the late twenties. The smaller Masters seem to be rarer and worth more than the larger ones.

There are several others that are much rarer than Master. Some are just made of unobtainium.


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Re: Robert m Roof 16 valve head

Post by Shelbycsx » Mon Nov 02, 2020 12:09 am

The B head came out in 1918. I found a number 270 stamped above the water outlet could this be the serial number, anyone else have a number there.
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Re: Robert m Roof 16 valve head

Post by Tom_Carnegie » Mon Nov 02, 2020 11:24 am

Stan, Mike Robison does have a 16 valve Roof, but this video https://www.youtube.com/watch?v=Ld3D-nEnSlY&t=7s is not of his. That is a Roof that I put together for Gil at the Miracle of America museum in Polson, MT. It came to me as a bucket of parts with stuff missing. I don't remember exactly what I did, but I had to make a bunch of stuff for it. The trick to making a Model A Roof run good is PC seals on the push rods.
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got10carz
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Re: Robert m Roof 16 valve head

Post by got10carz » Mon Nov 02, 2020 11:30 am

Here are some pictures of my 16 valve. It is a Model BB with 1 1/2" valves in a square pattern. This motor had Laurel pistons, Laurel aluminum rods, Luarel camshaft and radiator when I found it. These are the better rocker arms, than earlier versions. If I remember correctly the Model A head pictured above had push rods that went through the intake ports, creating a possibility of vacuum leaks, and bad idle.
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Topic author
Shelbycsx
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Re: Robert m Roof 16 valve head

Post by Shelbycsx » Mon Nov 02, 2020 12:18 pm

I heard about the leaks through the pushrods. The guides on top of my head look different from others I've seen. 4124 sounds about right for the BB head serial number. I'd be curious to what other A head serial numbers are. They said rajo made over 4,000 heads.


got10carz
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Re: Robert m Roof 16 valve head

Post by got10carz » Mon Nov 02, 2020 12:33 pm

Just for a discussion, do you suppose mine was the fourth model, remember that there is an 8 valve, 124th head of this model. The 4000 RAJO # seems small. They are everywhere. Perhaps Mark Chaffin, or James Roof will chime in.


Topic author
Shelbycsx
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Re: Robert m Roof 16 valve head

Post by Shelbycsx » Mon Nov 02, 2020 12:43 pm

Roof made a 16valve C head yours will be third model


Kevin Pharis
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Re: Robert m Roof 16 valve head

Post by Kevin Pharis » Mon Nov 02, 2020 10:09 pm

I stumbled across these a while back... it’s no surprise the push rods can become a major vacuum leak
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StanHowe
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Re: Robert m Roof 16 valve head

Post by StanHowe » Mon Nov 02, 2020 11:19 pm

Interesting!! I've never seen but one or two Roof heads.

Also interesting is the carb on the one Steve Meixner posted. That is either a U5 or U6 Zenith. Great carbs with a brass venturi. Hard to find that aren't all beat up and missing stuff. I am working on one for an overhead setup for some body in California. Interesting that one is on an original.

Zoom Zoom!!

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