Thickstun PM-7 Low?

Picked up this PM-7 in order to get some clearance to run the gene in stock location. Now realizing that I do not think it will work without some risers.
Question is has my intake been cut down? Or were some produced this way?

 

I've seen a few that were just like this, so I think it was a factory "option". They probably just took the regular tall PM-7 and milled the extra off.

 

Why do you think the generator won't fit? Even a low rise Offy or Edelbrock with Strombergs should fit the generator in the stock location.

 

They where cast in 7 inch hight, then the speedshop milled them down as much as you wanted.
A friend of mine had one that was milled with an angle to fit in a boat! the carbs where leaning alot. He had to mill it flat again to make work in a car.

The thickstun manifolds are a good street intake. I have used these and are very satisfied.

 

Chris just recently sold a low THickstun so they definitely so exist. Only on the super duals and even more so the 3x2 & 4x2 do the generators need a bracket off the side of the head. I would think at least.

 

I just ran into the same problem you have. I purchased a pm-7 and it is cut down like yours. A stock generator setup with external regulator will not fit. I ended up using an early generator 1936 mabe? that had a cutout switch on top. These are about 1/2" smaller in length. The rebuilder shop converted it to 12 volts and installed studs to be used with an external mechanical regulator. Worked great, and it allowed me to use the generator driven fan. This is in an AV-8 roadster with 59A.

Rob

 

Heres the only pic I can find. Its got 97s.

 

Alright cool! Glad mine is not an undesirable odd ball.
Looks like I may have to run the early style generator also.
Rob Paul could you please include some details about the pulley/fan that you are using?
I am also running a 59A in a 32 chassis.
Also post some pictures of the carb/generator clearance so I can see what I'm dealing with?

 

There are far too many of these at the same exact height for this to be a modified manifold. I believe they were produced this way. I own on & I've seen three others in the flesh, not to mention the dozens on here. They are all the same - they're not modified, it's how they were delivered. Not sure why, not sure what the market is/was, but I ran into the same problem you did trying to run a generator. I used spacers.

 

Ill get a picture up in a few weeks when I get the roadster back out to work on it. The generator was a problem because I didnt want to run spacers. I can give you the rebuilders info as well. The could build you a 12 volt version or at least tell your local shop how to do it.

Rob

 

There are four different heights of the Thickstun PM 7 Ford flathead intake manifolds that were sold by Tommy Thickstun. I have been collecting flathead intake manifolds for many years now and I have an example of each height in my collection. None of these were cut down. Everyone just assumes the shorter ones were cut down from the tall 7 3/4 inch version. Not so at all. Tommy Thickstun was a very smart man when it came to flathead design. The shorter PM 7 intakes were made so they would fit under the hood of a 1927 roadster. About the time these PM 7 intakes came out hot rodders of the day were just discovering aerodynamics. If you ran a hood along with a custom aluminum nose on your already very light 1927 roadster you went faster at the dry lakes and on the street as well. There were many 1927 roadsters racing at this time as they would walk all over the heavier Model A's and 1932's. There is a distinct advantage with racing a lighter car. The Thicksun PM 7 pictured on this thread at the start is the shortest one that was made. The tall PM 7 is 7 3/4 inches tall. The other two are 1/2 inch and one inch taller than the shortest PM 7. I have tried as well to mount a front mount generator on the short PM 7. The carbs make contact with the generator. Gave up on using the Thickstun and went with a front mount Edmunds instead. Hope this clears up some of the confusion with these intakes. Too bad Tommy Thickstun died at such an early age. One could just imagine what Thicksun speed equipment may have existed if he had lived to be an old man.

 

Great start to the thread! Thickstun mannifolds are awesome, just picked up a tall one last week with a original air cleaner also.

 

Wow I just learned a lot reading this!
Thanks a lot quickchange.
What I really need is the tall style (7") because I want to run a bigger 3 brush in stock form. Looks like I'm going to sell this one. Unless anyone wants to trade???
Let me know!

 

I have had a couple, just took the one off my 33 last weekend. It worked excellent, stock generator worked with a little shorter belt. I only pulled it off because I put one of my taller intakes on it...my friend really wanted that low PM7 from me.

 

Wouldn't take much of a spacer under the carbs to get the clearance would it?

 

No spacers needed, you can run a generator on the lowrise pM-7.

Heres a picture of mine showing the clerance with a 36 generator. I measured it and its about 1/2" shorter front to back than the later generators.

Here is the early style on left with the cut out switch and the later style with studs and external regulator.


Here is the early style mounted up. Not much room between the rear bolt and the carb, but it fits.



The cut out switch was removed and the rebuilder shop made it work with an external regulator. 12 volts. Charges great.

 

Alchemy,
I have seen quite a few that way over the years as well, I always just thought that the intake came two ways. Tall or short.

I think the fellas that ran 'em short moved the genny into a more valve in head type of a location to retain hood clearance. There is no reason that someone couldn't build a low mount gennie setup for a flatty. If someone will loan me an engine I'll figure it out and post prints. Or make a custom setup for sale, gawd knows I could use the cash and marketing some of my ideas may be a good way to do that. Hint, Hint

 

Is there any difference in performance between the tallest and shortest PM-7? How do you think the short PM-7 measures up against a Navarro Regular?