Hi Guys, I'm a very new at Big Block Corvette performance stuff so please bear with me. I have not been too lucky with the search function either.
My question is, what are my intake manifold options for a stroker BBC that will fit under the L-88 hood of my project 73 Corvette. I'm running a 4150 Holly carb and I need as large an open plenum area as possible. I'm currently running the decades old Edelbrock Torker 2 intake. The Dyno shop operaters and engine builders I have spoken to all say that the Torker 2 is costing my particular combination 25 to 30 HP and few hundred RPM.

O.K. but when I ask what they recommend that will fit under the L-88 hood with a L-88 drop base air cleaner, they all shrug their shoulders.

If anyone can help, I would appreciate it greatly!

Thanks for you time, this is a great forum!

Pat

 

I am running an edelbrock air-gap RPM and that fits. I have an aftermarket L88 hood, which should be the same. Anyway, Edelbrock publishes the specs for the Air-gap RMP and I am thinking that you can look at specs on other manifiolds and get an idea how close they are. In terms of the manifold you have now costing so much horsepower, I would think that only tru if you are running a very high breathing setup such as large aftermarket heads and a hot cam.. Sounds like you are..

 

For a dual plane intake, the Performer RPM is a good one. So is the Weiand Stealth.
The best single plane that will fit is the Holley Strip Dominator.

 

I'm running the Edelbrock RPM Air Gap under the L-88 hood too. I'm using the air cleaner base that came with my L-36 (390 HP 427). With the hood closed the foam ring compresses to about 3/4" in height when sealed to the base of the airbox. Although I'm sure there are minor variances that's about how much extra room you have to play with.

 

I have a 76 with an aftermarket hood ,bb style. I have an edelbrock alum intake with a 850 speed demon. it bearly fits. engine is a mark IV. I have a 3" drop K&L ? filter. Going to modify to air box to acess high pressure air at the windshield.

 

I second the Holley Strip Dominator. I am running one on my motor with the L88 hood and airbox. Another would be the GM 163 manifold which is the same as the L88 and ZL1 only with the divider cut out. You could get any manifold to fit but you would have to have it milled to have the same back to front slope as the 163 and the Holley manifold already have. I am going to have a Victor Junior done to fit in my application this winter.

Bill

 

Thanks for the quick responses! I'll take a look at the Holly Strip Dom. and get some measurements from it. I already have an old GM 163 intake but I really need something with large open plenum (single plane) for this particular unit.

This is a 505 ci engine with some fair flowing Edelbrock heads (330 cfm at .650" lift on the intake <2.30> valve) The unit peaked at 5600 rpm on the dyno last Monday so we all feel that we should have another 400+ rpm available with a decent intake.

I need to stay with an open plenum since we will also be using a 200-300HP N2O plate and at that power level and RPM the fuel distribution becomes very critical as we all know!

Take care,

Pat

 

I know for sure that the Strip Dominator will fit without the nitrous plate.
You will have to let us know how it works with the plate.

 

That plate's gonna make it a tight squeeze- good luck!

 

I am running a edelbrock victor jr on my 540 with the L88 hood and it clears by about 1/4 inch.

Only thing is if you are going to use the air box assembly for the L88 hood you need to do some mods to get it to fit

[IMG][/IMG]

[IMG][/IMG]

[IMG][/IMG]

 

I would do the AirGap hands down. It is dual plane but will out perform the tq2 at any rpm. If your cam peaked at 5600 then you should not have a single plane. Even with 505 cubes the AirGap intake will be equal to a good single plane at 6500.

 

I'm going to take a hard look at that Air Gap intake and also take a few measurements before I change anything. My only experiences with plate N2O systems OVER 200hp were with large, single plane intakes.

I really don't want to start experimenting with duel plane intakes with this much nitrous. A poor fuel distribution problem at higher RPM with a deul plane intake makes me kinda nervous.

Do any of you gentleman have any first hand experiences with large single stage plate systems on an Air Gap or similar manifold?? I would be very interested in your findings.

 

I have not known anyone to run over 150 shot on the airgap. Just should not be needed unless you have a promod chassis and serious tires lol. Run a Victor Jr. and a bigger cam. You should need something in the 272 -285 @ .050 ground on a 114 LSA for your plans. Your current cam is may be too small for over 250hp nitrous.
I assume this is a track only car. Otherwise...

 

Not all the intakes being discussed come in both square port and oval port. Sounds like you're running square ports,..

 

Currently running the Edelbrock 6045 heads. The heads are what we refer to as the Rec-Ovals! Used them for the smaller chamber size (108cc) after milling and they flowed pretty well from .300" up to .650" after extensive porting. Would have used some after market alum rectangle ports if the 6045 Edelbrocks were not such a good deal.

The car is a street strip deal. 99% of the time on the street. The only time the bottle goes in is at the track.

Looking for a low 10 sec pass when it's finally all sorted out. Best N/A 60' is 1.61 so far, so I 'm fairly optomistic about my goals.

Pat

 

What NA times/mph have you run?

 

What intake(s) does Edelbrock recommend with those "Roval" ports?

 

Just because the hood will close does not mean the intake "fits" I did a lot of testing with my 500 rwhp 454 (ported ovals, solid roller etc) and found with a RPM Air Gap the intake costs 35 hp with the hood closed, vs open. This was with a drop base and extreme top, L-88 hood, etc.

Forget the plate, get a Fogger. Nitrous Supply in Huntington Beach has great deals. 714 373 1986

Do you race at Irwindale ??

 

Howarc - So far we have gone 7.1 in the 1/8th at 90 something. Coasted to 12.0 at 94mph so as not to get scoulded for no yet having a roll bar. Now have the roll bar, D/S loop etc. so we can finally make a few full passes.

73 Dark Blue 454 - I really don't know which intake Edelbrock recommends for those heads. I would guess that its NOT that Torker 2 that is currently on it! FYI I was at the Fontana race track last weekend for the PSCA finals and Edelbrock had their tractor - trailer display set up. I spoke with 3 different Edelbrock guys before I found an senior employee who was familiar with the BB Torker2. When I told him about my 505 inch combination, he didn't think it would make power above 5000-5200 rpm. I guess we were lucky to get our peak where we did!! (5600)


69 N.O.X. RATT

The goal with this is mid 10s on the Nitrous - mid 11s N/A. The plate should get us in the ball park. The fogger looks real tempting though!
I can always use the plate on my 69 Chevelle.

When we dynoed last Monday (at VACA Performance in Downey) We got the same 425WHP with the hood open and closed. That was VERY suprising to us! Not yet tested on the dyno w the nitrous. We will probaly wait till the next track rental or street legal day at Fontana.

Have not been to Irwindale yet. I have heard that the track is much better these days so I'm looking forward to going.

 

Fonz69 -

Could I trouble you to post a few pictures of your completed hood modifications (under hood) Thanks

Pat