[Chris-Austria]

Hi,

I'm thinking of using the Performer RPM intake instead of my Performer.
Hood clearance will be fine, but I cannot use my spacer anymore, which was very good at keeping the temps low in the carb.

I still have a heat shield for my Holley, which will fit even with the Performer RPM.
Do you think this will work well or will I get my heat problems back?

Car is a 66 GTO, 462cui, HR cam (224/230), e-heads, 4 Speed, 3.55 gears... I think it will benefit from the RPM manifold.

What do you think?
Change or keep the old one?

Chris

[b-man]

Definitely change.

[STEELCITYFIREBIRD]

Rpm is a much better intake for that large of an engine.

I truly feel that heat shields are ok for drag racing but driving over the road you will have the same heat soak with or without. Fuel vaporization cools your carb over the road. In traffic any carb will heat up with or without a heat shield.
Even for drag racing, if you want consistent ET, not max ET, heat soaked carb is better as long as it doesn't cause driveability issue.

[Tom Vaught]

CHANGE RPM is a great intake for a 462 engine with that camshaft.

Tom V.

ps Chris, you have a 66 GTO, have you opened up your hood scoop insert? (or left it out)? Boundary layer is not ram air but it will still help cool the carb with an open element air cleaner.

[tom s]

Any thoughts of a HSD?I have one on a 455 stick shift car with a touch more cam.Same height as a stock intake so you could use your spacer.Tom

[Squidward]

I was going to write how a Crosswind intake might be what you want, but it seems like they are not available except in small pockets with leftover inventory. I run them on both of my motors, and the fit was WAAAY better than my RPM. Plus it has no exhaust crossover (big gap to valley pan), so it probably helps cooling.

If you could find them, I'd recommend it based on my understanding of your needs. But if they quit making them, I guess the point is moot.

I guess this is the brand that took over from PP?...
https://speedmaster79.com/pce1471058...anifold-satin/
http://www.jegs.com/i/Speedmaster/74....1058/10002/-1

Looks the same as my Crosswind. Here in the states, I wouldn't have a problem trying it. If it didn't fit, I'd send it back via Jegs, Amazon, etc. Amazon is great on returns.

[ta man]

A torker 2 would be a good choice too.

[Steve C.]

The Hurricane/Tomahawk Intake is the same as a Holley Street Dominator single-plane intake.

http://butlerperformance.com/i-24453...tegory:1234847

As cast the Tomahawk intake has small port openings for marketing reasons, this so they can work on all cylinder heads including a stock factory head. It will take a bit of port work and blending up the runner to work on a set of Edelbrock heads.

.

[steve25]

If you are running stock iron heads you will not have any gain by switching over to the rpm as long as you are running a 700 cfm Carb or better.

Your average power numbers will be better with what your running now.

That Manifold with stock heads on a 455 will support 415 hp.
It likes a 1" open spacer also.

If your Heads have been ported and Are flowing more than 220 cfm and are over 165 CCs in port volume then the rpm Intake will be the way to go!

[Steve C.]

Edelbrock heads in use with a Performer intake.


.

[Chris-Austria]

The hood scoop insert is open.
I ran into some heat (vapor) Problems with the Holley 750cfm on my Performer intake, so I used a spacer and a heat shield... worked very well for me.
Since the RPM manifold will not allow me to use the spacer (only the heat shield) I'm not sure, if I will have heat problems again.
The RPM intake is much higher.. maybe it will not create the same heat as the Performer did, because the carb sits higher without a spacer?!

I want to keep some kind of dual plane manifold.. with my gears I always drive with at least 1400rpm.. so the power band seems to make more sense... at 500rpm (or lets say at idle) it just will turn the tires.. no need for "more" torque down there... maybe the RPM manifold will give me the power at rpm's, that are "useable". Thats the idea

But still... I'm most concerned about the heat.. I don't want to have hard starts or stumbling when driving because the fuel bowls are too hot.. Most of the time I drive it on the street..

The E-heads I have should flow about 260cfm with 204cc intake runner volume and the carb is a 750cfm Holley DP.

[GTOLou]

Originally Posted by Chris-Austria

The hood scoop insert is open.
I ran into some heat (vapor) Problems with the Holley 750cfm on my Performer intake, so I used a spacer and a heat shield... worked very well for me.
Since the RPM manifold will not allow me to use the spacer (only the heat shield) I'm not sure, if I will have heat problems again.
The RPM intake is much higher.. maybe it will not create the same heat as the Performer did, because the carb sits higher without a spacer?!

I want to keep some kind of dual plane manifold.. with my gears I always drive with at least 1400rpm.. so the power band seems to make more sense... at 500rpm (or lets say at idle) it just will turn the tires.. no need for "more" torque down there... maybe the RPM manifold will give me the power at rpm's, that are "useable". Thats the idea

But still... I'm most concerned about the heat.. I don't want to have hard starts or stumbling when driving because the fuel bowls are too hot.. Most of the time I drive it on the street..

The E-heads I have should flow about 260cfm with 204cc intake runner volume and the carb is a 750cfm Holley DP.

I really vote for a bigger cam. I've run HR's in 455+ engines with 224 (felt stock), 230 (torque brute - underused cam IMHO) and 236 on the intake.

With Eheads - if you have any kind of compression I've put a bigger cam and the RPM or TII with spacer. I really don't think the RPM will do much to give you more RPM/breathing with that cam.

[Dragncar]

I bolted on a Tomahawk and ran a 11.10 @118 on a windy day. Warrior ran 10.93 @ 119, so not too bad. They work well.
This was with iron HOs and 91 pump gas, 9.3 CR.

[Chris-Austria]

CR is 10.3:1...
Did anybody notice a difference with heat transfer to the carb when changing from the Performer to the RPM?
The cam is mild, I know... but I was told that the Performer intake is even small for a stock 455.. not sure if there will be a big difference by just changing the intake..

[steve25]

Sorry, missed the E Heads your running!

[GTOLou]

Originally Posted by Chris-Austria

CR is 10.3:1...
Did anybody notice a difference with heat transfer to the carb when changing from the Performer to the RPM?
The cam is mild, I know... but I was told that the Performer intake is even small for a stock 455.. not sure if there will be a big difference by just changing the intake..

I am not sure about the "heat transfer" issue. But - I'd think that a taller RPM won't transfer anymore heat than a Performer. I don't think it'll make a difference.

Does the motor/car have heating issues? Remember that an undercammed motor with decent compression will run hot.

Change to the RPM. Won't hurt anything for sure - I've seen some people mill the carb pad too, if you need a bit more clearance - maybe others will chime in. The RPM will help when you eventually swap up to another cam ,

Good luck.

[Steve C.]

Reading online it has been suggested a heat shield will help some, but won't cure carb heat soak. Presuming that is an issue. Aluminum spacers offer little if any protection against heat soak. Wood fiber laminate, black phenolic plastic and heat insulator gaskets provide better insulation.

Then there is the fuel delivery system to consider.


.

[HaloMedic]

Originally Posted by Chris-Austria

Hi,

I'm thinking of using the Performer RPM intake instead of my Performer.
Hood clearance will be fine, but I cannot use my spacer anymore, which was very good at keeping the temps low in the carb.

I still have a heat shield for my Holley, which will fit even with the Performer RPM.
Do you think this will work well or will I get my heat problems back?

Car is a 66 GTO, 462cui, HR cam (224/230), e-heads, 4 Speed, 3.55 gears... I think it will benefit from the RPM manifold.

What do you think?
Change or keep the old one?

Chris

I'm using a 1" spacer under a 750 QFT Holly, 455, RPM manifold 66 GTO no issue w/clearence

[Chris-Austria]

Originally Posted by HaloMedic

I'm using a 1" spacer under a 750 QFT Holly, 455, RPM manifold 66 GTO no issue w/clearence

What kind of air-filter do you use?
I have a 3" drop base on my Holley...
The heat shield needs about 0,5" as well.. there is a thick gasket underneath to reduce heat transfer.

[Chris-Austria]

I ínstalled the Performer RPM now.. it fits

- RPM manifold
- heat shield (0.35")
- spacer (0.5")
- Holley 750cfm DP
- 3" drop base air filter