Anything to gain by switching to a single plane manifold?

[68 HEMI GTS]

My rpm manifold is completely un-modified.

Probably a bit of room for improvement on that with a little work.

 

[66Satellite47]

For a street car a TM6 would work well. I found the throttle response could be made great. Takes a little tinkering. My low deck 451's did well with the TM6. I welded the silly bolt notches & ported the runner straight. It was a very good manifold. Although probably near the modern stuff.

 

[66Satellite47]

I should have also said my 500" motor with a .500 cam & Torker manifold worked well. I changed to an old style long duration cam and a Victor manifold. Victor is a big volume piece, still was plenty responsive. Again was very street friendly. But fairly loose converter and 4.10 gear.

 

[68 HEMI GTS]

For a street car a TM6 would work well. I found the throttle response could be made great. Takes a little tinkering. My low deck 451's did well with the TM6. I welded the silly bolt notches & ported the runner straight. It was a very good manifold. Although probably near the modern stuff.

You see any difference from eliminating the notches? I've thought about welding mine.

 

[66Satellite47]

You see any difference from eliminating the notches? I've thought about welding mine.

As I recall, nearly a tenth. In the day, that was a surprisingly good manifold. I'm sure today's tall manifolds produce more power, but you're fighting hood clearance.

 

[68 HEMI GTS]

As I recall, nearly a tenth. In the day, that was a surprisingly good manifold. I'm sure today's tall manifolds produce more power, but you're fighting hood clearance.

Damn, that's a worthwhile mod !

 

[66Satellite47]

It might have been a little more than a tenth improvement. The modified TM 6 wasn't a bunch slower than my tunnel ram 2 650 DP's. In fact when I got my Arrow going I used the TM6 & one of the 650 DP off the tunnel ram. It ran great, within 2 tenths of the tunnel ram.

 

[383man]

As most said alot depends on the combo but I can give you some results from my sons Dart with a 400 in it. Its a 400 with Eddy RPM heads and the MP .557 cam and uses 3.91 gears. Its a pump gas street car and weighs just over 3600 lbs with him in the car. He ran 11.59 @ 117 with the single plane Holley Street Dominator. With the Eddy RPM he ran 11.55 @ 116 mph. You could see on his timeslip it was a faster 60 and 1/8 with the RPM intake and even though it had more mph with the single plane it was not enough to et as good as the RPM did. He also says it just feels much pepier at lower rpm with the RPM intake. He has since worked his et down to 11.41 @ 117 still using the RPM dual plane intake. Myself I run the Indy dual plane on my 63 but its a street car with a trip to the track every now and then. Its run 10.70's but I have never tried a single plane on the car to see how it likes it. Ron

 

[dieseldazzle]

If it wasn't going to run a nitrous plate on my car I would also go with a port matched Eddie rpm versus my m1 single plane (446/trickflows flat tappet solid lunati cam)

 

[dvw]

As most said alot depends on the combo but I can give you some results from my sons Dart with a 400 in it. Its a 400 with Eddy RPM heads and the MP .557 cam and uses 3.91 gears. Its a pump gas street car and weighs just over 3600 lbs with him in the car. He ran 11.59 @ 117 with the single plane Holley Street Dominator. With the Eddy RPM he ran 11.55 @ 116 mph. You could see on his timeslip it was a faster 60 and 1/8 with the RPM intake and even though it had more mph with the single plane it was not enough to et as good as the RPM did. He also says it just feels much pepier at lower rpm with the RPM intake. He has since worked his et down to 11.41 @ 117 still using the RPM dual plane intake. Myself I run the Indy dual plane on my 63 but its a street car with a trip to the track every now and then. Its run 10.70's but I have never tried a single plane on the car to see how it likes it. Ron

The Holley Street Dominator is not your run of the mill single plane. It is small runner and a very GOOD street manifold. At one time was as good as you could get. Don't confuse it with the big port modern stuff for mild applications.
Doug

 

[Dodge 330]

The Holley Street Dominator is not your run of the mill single plane. It is small runner and a very GOOD street manifold. At one time was as good as you could get. Don't confuse it with the big port modern stuff for mild applications.
Doug

I run the Holley Street Dominator. I swapped it for an identical ported unit and picked up 1/10 and 1mph.

 

[not so famous bob]

I run the Holley Street Dominator. I swapped it for an identical ported unit and picked up 1/10 and 1mph.

the street dominator is good, but it`s old school. read the big block intake comparisons on them. they ain`t that great.

 

[67coronetman]

Well let me give my two bits not that they really matter I'm not a drag racer in the sense of trying to pick up every tenth of a mile per hour so I don't have all the data and experience of some of these guys do and it's a good idea to listen to some of them but also with that said....
I used to have people tell me that you could not run a single plane on the street and be happy with it that's a bunch of crap I run a Mopar M1 intake on my street car with a built 440 and I have no issues whatsoever the car drives and operates great plenty of torque and Power I myself did not like the RPM intake I thought it kill my motor

 

[LemonWedge]

I'll be real interested in the results of this as well. I run an RPM on my 451, and have always wondered if I'm giving anything up. My car runs 11.60's, and is also listed at the 11-second combos thread. I may have the opportunity in the spring to do this exact same back to back test. I'll be watching here and if I have the chance to do a swap-test, I'll report my results.

 

[67 coronet]

i run a victor on my 383 and had a buddy tell me to try out some spacers.(he is an engine tuner)tried several,but got a huge wake up in power with a 2 inch spacer.its all seat of the pants,monster street car.seemed to improve the signal to the carb with the spacer.all i am saying is try everything you can,who knows until you try it.