cv67

Has anyone asked Edelbrock?

Kubs

Of course not! That would be too easy!

Corvette Chris

Come on now Ron. You know we wouldn't do a thing like that.

USAsOnlyWay

I sent them an e-mail asking a couple of things, no dice. I resent it.

Well maybe it got bounced last time, they just replied really quickly!

1) Does the Pro-Flow XT fit in a C4 Corvette?

The #7137 XT manifold only is 9.5 inches tall at the area just behind the throttle body.


2) Runner length, plenum volume? Where do you predict it to peak (RPM) and what is the "max" hp capability? Any dyno runs?

Approximately 5” of runner length and 190 cubic inches of plenum volumne.


3) Individual part number? As I mentioned, I have C4 Corvette, I need just the manifold, not the ECU etc. Does it work with your other fuel rail kits (VicEFI?)

The #7137 is the manifold only. #3627 is the fuel rail only kit. #3869 is the throttle body.


Also it looks like the rails are the same but there is a small aluminum bracket that may be different with the 3627 kit versus their other ones.

So based on the 9.5" measurement, I don't think it would work. Based on their published 9.09" measurement, I would think it would.

UnderPar

I would like to see a dyno graph and the shape of the curve. From the pictures on their website it looks like the runners have a nice taper and would help with low rpm port velocity.

Corvette Chris

So how tall is this sucker? 9.09 or 9.5?

Kubs

I know the HSR is 1" too tall, correct? What is the overall height of that intake?

Orr89rocz

this intake is more comparable to the HSR but its runner length is between miniram and HSR. miniram is like 3-3.5" while HSR is like 6-7". SO if it flows well, it should support power inbetween those other intakes which puts it well into the 6000-7000 range depending on motor setup. Sounds like a winner if it fits

HSR looks to be about 9.5-9.6 inches up front and closer to 9.75 rear but thats rough measurement. I do know with poly engine mounts it doesnt fit on my Camaro. I cut all the bracing out and the hood is resting on the TB but still closes. Its about 1/8 inch from being perfect.

plenum volume is small tho

USAsOnlyWay

I'm thinking at the china wall it is 9.09" tall, but at the highest point, where the TB flange is, it is 9.5" tall.

The question is, what are our hood clearances at each point. If our hood clearance is 9.150" at the china wall, I'm doubting it will fit...but I'd like to be proven wrong.

Also, like I said, I pulled 9.150 off of someones SP thread and I can't guarantee its accuracy myself.

USAsOnlyWay

Orr, if you're right about the 9.5" for the stealth ram, its a definite no go.
Lame.

Orr89rocz

if edelbrock is 9.5 and not 9.09 or whatever it was, then probly wont work and its probly as tall as HSR but certaintly looks shorter in the pics.

again, i just took a quick rough tape measure measurement and it looks to be between 9 and 10 and closer to 9.5

USAsOnlyWay

I think it IS 9.09 at the front of the intake, the flange is not at the front of the intake though. That is the high point @ 9.5".

Thats my speculation at least.

Midiman

My HSR is 9.6" tall from the underside of the intake manifold (china wall ) to the top of the throttle body. Its tough be sure that it is exact without removing the throttle body. But it is not taller than that for sure. I will be removing the throttle body for some detail work soon. So I will post up after that.

USAsOnlyWay

So the question is, how many inches set back from the china wall is the TB flange on the pro-flow, and how much clearance do we have at "__ inches" back of the china wall.

Chief_engr

Hey Guys,
Just came across this, and I happen to have the prototype manifold at my desk. If you turn the manifold upside down so it rests on the plenum ribs its only 8.25" to the rear china wall. It's .80" taller at the peak of the throttle body flange. The throttle body flange is about even with the second manifold to head mounting hole on the drivers side.

The 450 HP refers to the injector size we include in the EFI kit. With a 3.4 sq in runer at the plenum and 5.5" long runners the manifold is capable of hanging with whatever you have. It be really cool if it fits your cars!

USAsOnlyWay

So if I understand you correctly, it is 9.05" at its highest point, which is the throttle body flange?

Secondly, this point is about even with the second manifold to head bolt on the drivers side. How many inches in is that?

There might just be a chance that it fits...

Z51L9889

As a point of reference, I just measured my FIRST intake and it is 9.06 inches high at the TB flange, which also happens to be about even with the second intake bolt hole on the driver's side.. The FIRST is known to fit under the hood of a C4 so the Edelbrock manifold itself should fit. On the FIRST, the clearance issue is not the manifold itself but the throttle body, so the key will be the angle, if any, that the throttle body is pointed downward on the Edelbrock. If it comes straight out, my guess is that it will not fit. However, I seem to remember seeing angled throttle body spacers for sale, so this may not be that much of an issue.

Orr89rocz

any flow numbers for it? whats the minimum cross section area at the entry to the head port? Does it fit a 1206 port?

Never Satisfied

Subscribing

Slalom4me

Length of the outward side of an HSR runner wall is 5-3/4".
Length of the inward side of an HSR runner wall is 6-1/2".

The stated runner lengths for the Pro-Flo XT of 5" (post #24) or
5.5" (post #35) are expected to have the effect of moving the
TQ/HP peaks up the curve, relative to the OEM HSR lengths. The
results might be in line with where the modified HSRs (LD85, JoBy
USM Inc ...) peak.

The top of the TB is not the highest point of an HSR intake assembly.

Excluding the plenum-to-runner cluster gasket, height to the top
of the HSR plenum ribs at "position A" is 9.7188". (The HSR base
measures 5.8438" (5-27/32") to the top of the runner cluster, the
HSR plenum measures 3.8750" (3-7/8") to the top of the ribs.).
With a gasket, the overall height would be >= 9.750" at "A"

The HSR numbers above are derived from the same method Edelbrock
uses:



For the Pro-Flo XT, Edelbrock publishes height as: A-9.09" B-8.20"

If the comment is about the HSR, then consider that, given the
figure of 190 ci stated for the Pro-Flo XT in USAsOnlyWay's
post above (#24), the HSR plenum has more than 40% greater
plenum volume than the P-FXT.

Edelbrock recommends their #7201 intake gasket:
7201 - 2.09 in. x 1.28 in. Port, .060 in. thick.

This compares with Fel-Pro's
1204 - 1.99 in. x 1.23 in. Port, .060 in. thick.
1205 - 2.09 in. x 1.28 in. Port, .060 in. thick.
1206 - 2.21 in. x 1.31 in. Port, .060 in. thick

Finding a suitable thermostat housing for an L98 C4 application
may/may not be a consideration.



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