Slingshot vs. Tattersfield

KiWinUS said:
Here’s one in the works. And have enough parts to build at least 7 more V8/60 race engines. I’m sick I know. Also just starting an engine for a 1948 Kurtis midget.
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491508
 
FritzJr said:
Hot Rod Magazine did a test on a number of different manifolds a few years ago. They showed the Slingshot to give better performance than the Thickstun PM-7 / Tattersfield. (Your mileage may vary.)
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Wow, a lot of interest in this topic. I found the Hot Rod Magazine article rating the Slingshot well above the Thickstun PM-7 / Tattersfield.


There's a lot of outstanding information on this thread.


Moving very slow on building my ride (1941 Ford Special Business Coupe;) trying on a lot of different ideas for size. After reading all of the replies and the HR magazine article, sounds like a Slingshot is the ticket.


Looking at used intakes and Stromberg 97s but also looking at brand new. Money's not the issue. Driveability and cool are both important. Seems like the old manifolds will work just fine but sometimes rebuilding an old Stromberg can be a crap shoot. My performance goal is solid, snappy low end, off-idle, performance from stoplights to cruising speed of 35-45 mph.



Hard to tell if a Slingshot with dual 97s is going to make any difference in the performance of my stock '41 221 cid flatty. So long as it doesn't make it worse, I might go for it just for the cool.


Current intake is stock and current carb is a leaky, stinky self-rebuilt Holley 94 that dribbles gas on my intake. Looks like the gas is coming through the idle adjust screws. Also have an annoying off-idle stumble. Even a single new out-of-the-box Stromberg 97 sounds good while I make up my mind about a 2x2 setup.
 
I put a new 97 on the 221 in my tired and smokey 41. I gave me a noticeable improvement. Not exactly neck snapping, but good to better get up hills in my area. Might be a nice interim step.
 
The new original 97's are great carbs - would highly recommend them. If it was me, I'd buy the TWO that you'll need now - as one never knows what will happen in our whacky supply chain challenged world!

There are so many engine components that are extremely hard to find or get manufactured at the moment - the whole parts manufacturing industry is on its head at the moment.
 
Just discovered one challenge with using an Edelbrock slingshot on a stock 41 flathead with a helmet distributor: no port on the manifold for unported vacuum to the vacuum brake.


Any thoughts?
 
SoCalCoupe said:
Just discovered one challenge with using an Edelbrock slingshot on a stock 41 flathead with a helmet distributor: no port on the manifold for unported vacuum to the vacuum brake.


Any thoughts?
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They are there. There are two on the left side of the bottom portion of the manifold. I had to plug them to avoid vacuum leaks.

They are in between some of bolt holes and sit right over the intake runners in the block.
 
Tim Ayers said:
They are there. There are two on the left side of the bottom portion of the manifold. I had to plug them to avoid vacuum leaks.

They are in between some of bolt holes and sit right over the intake runners in the block.
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Hmm. Thanks for the info. I believe you but don't see them in this picture. Maybe someone besides Edelbrock drilled them?


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SoCalCoupe said:
Hmm. Thanks for the info. I believe you but don't see them in this picture. Maybe someone besides Edelbrock drilled them?


picture.php
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No, stock from Edlebrock. Look at the holes to the side of the front and rear runners. Those are not bolt holes. They are holes to run vacuum to the dizzy. They go into the intake runner for vacuum.

Look at your block and/or stock intake. There are no bolt holes that far outside of the intake runners.
 
Tim Ayers said:
No, stock from Edlebrock. Look at the holes to the side of the front and rear runners. Those are not bolt holes. They are holes to run vacuum to the dizzy. They go into the intake runner for vacuum.

Look at your block and/or stock intake. There are no bolt holes that far outside of the intake runners.
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Got it, thanks!
 
Bored&Stroked said:
The new original 97's are great carbs - would highly recommend them. If it was me, I'd buy the TWO that you'll need now - as one never knows what will happen in our whacky supply chain challenged world!

There are so many engine components that are extremely hard to find or get manufactured at the moment - the whole parts manufacturing industry is on its head at the moment.
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I did it; I just ordered TWO.
 
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FritzJr said:
Hot Rod Magazine did a test on a number of different manifolds a few years ago. They showed the Slingshot to give better performance than the Thickstun PM-7 / Tattersfield. (Your mileage may vary.)
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That's a great reference. For anyone else who's interested, here's the link.
 
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