Slingshot Manifold
 

Is it ok to install a Slingshot manifold on a stock 59 motor?
If it is, I'm looking for some suggestions as far as pros & cons, alternatives,
carbs, jet & pv sizes, linkage etc.
Thank you,
Joe

Re: Slingshot Manifold
 

I would be interested also twin carbs has been on my mine for some time.. BUT also the realities.. Is it really worth it? Trying so hard to think it is.

Re: Slingshot Manifold
 

The reality is that it wont make much difference to a stock engine..... but it will look cool! We tend to over-carb our flatheads. A bored and stroked engine with a mild cam still only needs twin carbs at most. I knew a guy with a 284" flattie in a race car. He said there was absolutely no difference in performance between twin carbs and triple or four on his engine. Having said that, he did not over-cam it, he needed a wide power range and lots of torque. A wilder cam would no doubt be looking for more flow.

Re: Slingshot Manifold
 

We just finished a 29 roadster pickup with a 59ab motor mild cam navaro heads,2 new 97 carbs, lots of torque, runs great, but the best thing is looks cool with those duel 97 carbs, (ran just as well with one) just our opinion.

Re: Slingshot Manifold
 

I have a Slingshot on my 276ci 3/4 cam FH and it runs great. Big improvement over one 94.

http://i5.photobucket.com/albums/y17...ps748ef54e.jpg

Re: Slingshot Manifold
 

Go for it, setup right you will feel the extra urge up top.
Martin.

Re: Slingshot Manifold
 

One advantage of dual carbs is: fuel economy. However the tests done by Motor City Flatheads showed the most efficiency was for dual carbs situated over the intake ports ie. you cannot fit a stock generator because the front carbie is too far forward. MCF found the most efficient setup gave a small increase in power (on a stock engine) but more importantly a five percent saving in fuel was noted.

The old Hotrodders on a budget had it right, two or three carb's, high compression heads and more efficient headers. That triumverate gives a measurable increase in power. Having said that, many of those old Hotrodders drove their cars every day, and of course the benefits paid off because of that efficiency. If you don't drive your car often enough then you've just invested in the 'Bling' factor. Having said that; it's a really good look, expensive but good.

Re: Slingshot Manifold
 

If you read my book, and pay attention, you will see the answer to your questions. Yes, dual carbs on a stock engine is a worthwhile upgrade for both power and economy.

Re: Slingshot Manifold
 

Glad you came along John, I'm going to have to go back and study your book again! I cant remember any significant gains except over 3000 rpm? Just hard weighing up cost to benefits.. But damn they look cool!

Re: Slingshot Manifold
 

2nd JWL. I've seen it over and over, with a 59 stock engine, 2 carbs set up right with the right jets and power valves, you'll notice difference in power and driven right better mileage, the next best thing you can do is mill the heads, they usually will stand .050 mill, again snapper engine and better mileage, headers will help a little but not as much as milled heads. Don't touch the cam. Walt

Re: Slingshot Manifold
 

I believe it was the Jan. '13 issue of Hot Rod that did a FH intake shoot out and the Slingshot was the best 2 carb. setup. Widest HP and Torque curve. That's the reason I choose it and besides it's the coolest looking.

Re: Slingshot Manifold
 

This is a sling shot adapter so don't get confused folks over a a slingshot and regular dual manifold. As JWL and Walt said properly set up twin carbs will make a good seat of the pants difference. Hot rodders for the last 70 years can't be wrong. But a slingshot on the other hand looks fast but in my opinion does not distribute the fuel evenly. We had an Almquist slingshot y adapter on our 32 and found fuel pooling in the ends of some runners. It's now gone and an Eddie Meyer twin in its place , the slingshot looked fast but didn't perform as well as a better designed twin carb manifold.

Re: Slingshot Manifold
 

This may be heresy, but who is JWL, what is name of his book, and how can I get one?
Thanks, Ford Barners........

Re: Slingshot Manifold
 

Thank you to all who responded!
I have a 59 carb on there now with .050 jets & 5.5 pv.
This was set up by Ken ct and runs perfectly.
Can someone give me details about a starting point for setting up the second carb?
Do I run the same carb with the same sizes jets & pv?
Does the linkage have to be set up to have the second carb open once the rpm's get up a bit so it doesn't bog?
Thank again to everyone!!

Re: Slingshot Manifold
 

I would start out with the carb exactly like the first one. I would not use progressive linkage.

Re: Slingshot Manifold
 

Please do not run progressive with twin carbs.its of no advantage.more than likely a hindrance.

Re: Slingshot Manifold
 

Are you talking about an Edelbrock slingshot or the "paperboy" sling shot that goes on a stock manifold that Tardell or Almquist use to sell?

Re: Slingshot Manifold
 

91A-77B Go to his post click on JWL and send him a message asking about his book. Im sure John will get back to you quickly. Its a good book with no BS some truths about flatheads.

Re: Slingshot Manifold
 

JWL's book is a must have for any flathead enthusiast.

Re: Slingshot Manifold
 

The Edelbrock