Hot Rods SBC Edelbrock manifold comparison

Okay guys,,,,,I’m looking for an idea of which manifold I should proceed with .
I could buy a brand new “anything “,,,,but at this time these are what I have,,,,and they are free and clear .
So,,,here goes .
This engine is gonna be a pretty healthy street engine,,,,not a race engine .
I’m getting old,,,,,and would like to do a nice replica of what I had many years ago .

The block,,,,an 010 casting 350,,,,,bored .060,,,,4 relief flat tops .
Warm Hydraulic cam,,,,,.473- .497 lift .
2.02 - 1.60 heads .

Here are the intakes :
Edelbrock C3BX
Edelbrock Performer RPM

 

Old Torker. Lippy

 

yeah, the old one, of course.

 

I've ran both on the 327 in my Henry J and they both work well. Both with the same 670 CFM Holley Street Avenger carb. I got the Perf RPM cheap and have it on now. I removed the performer RPM lettering and drilled for a fill tube so it wouldn't look so modern. The C3BX is on the 305 in my '36 Ford "bobber" truck With a 570 Street Avenger. I tried a Holley single plane on the 327 and it didn't like it much, or maybe I just didn't know what I was doing tuning it.

Gary

 

Old
Because you said you wanted to replicate a past engine.
A couple of HP or pounds of torque between the two isn’t very important

 

I prefer the taller performer. Anything to help the torque.

.

 

I'm with lostone. perf rpm

 

RPM, I hate giving up performance....

 

I like sleepers grind off the logo and paint them orange

 

here's a way to get some performance back, with an old intake

https://www.ebay.com/itm/224883576769?

 

I’d use the CBX3 after lightly blasting it to get remove the shine. For the oil tube I’d use an early Z28 with a seal top cap.

 

I voted for the C3BX but only because of the front oil fill tube. The Performer RPM is almost definitely a better intake that will make a bit more power. Such is the way of progress. But the old intake is still a solid option, and looks like someone already tried to make an "air gap" in the plenum. Aside from reliability, looking cool is always my top priority. If I'm going to get gapped by any bone stock new Challenger, Mustang GT or Camaro, I might as well look cool.

 

Performer RPM for sure. It's not only about power but driveability also.
Notice the “waffle” pattern at the bottom of the plenum on the Performer. This is an intentional feature that helps keep the fuel and air consistently mixed on their way to the cylinders.

 

C3BX...but be aware that it may not work with an HEI if that's your ignition choice.

.bjb

 

Well I like a stock later truck intake with the plenum cut for a mild street motor. That is pretty much what the Performer is.

if I was building a hot rod I would go with the C3BX. It is more of a hot rod manifold.

 

With C3BX
With Performer RPM with oil fill tube added.

Gary

 

I would guess that any performance gain with the RPM would be marginal at best. It would be interesting to see some dyno numbers with them both on the same engine.

 

I meant neither of those. Get a single plane old Torker and feel the high rpm kick.

 

I've had both over the years there isn't that much of a difference power wise at least on the streets I say go with the c3bx purely for the old school look

 

Another vote for the rpm after you removed the "performer rpm" letters and drilled it for the oil fill tube.

 

The modern E-brock (not trad fellas) air gap. Same w/modern cam ground to your exact build.

 

I’m into details on a hot rod. I’m not talking about having screw heads properly clocked or the lettering on a tire lined up with the valve stem and the logo on the center cap on a mag wheel too. My concern is if the suspension fits the theme of the car, does the engine look right too, and stuff like that.
If I was building to a ‘60’s theme the Performer would stick out like a sore thumb, no matter how it was doctored.

 

What heads are you running, how do the ports line up?

 

The taller one...
Closest to the LT-1 intake which was an amazing factory intake across the rpm range..

 

I'm a performance kinda guy and would take that intake out of those two because it's more efficient at making hp.
It's not like it's a modern Victor Jr. or something, John Q. Public wouldn't know the difference, only the anal guys that walk around and pick apart other people's car would notice.

 

That's it, right there. I don't give a flip what JQP thinks. The guys who know, are who I'm building my car for.

Gotta be the early one.

 

From it sounds like you are trying to do, go with the C3BX.

 

How does each one perform from 650 to 3000 rpm is way more important to me than 5000-up. Fuel milage at cruising speed is nearer the top than once was.