The guy building my 468 and I agreed to use a Torker II intake for better clearance on my car. This was before we switched to the Canfields. Now I have Rect. Port Heads coming on the engine. Judging from Edelbrock's site, it looks like they only make the Torker in Oval port.

Any suggestions on a manifold? An L88 hood is not an option here.

I *repeat* an L88 hood is not an option.

I also need to go with an aftermarket intake. I'm not going to spend 10 years looking for and paying 400 dollars for an LS-6 intake either.


I have a hard time believing Edelbrocks site now. They say over and over again that the RPM's, and the air gap manifolds wont fit under the hood, but I saw an RPM Air Gap under clink69's STOCK smallblock hood fit just fine. He had a massive drop base air cleaner, but it fit. This was on a 350 btw. I'm going to be running a 468.

Does anyone have any experience here? I have an aftermarket hood that looks like a BB/LT1 hood, but only has about 1.5 inches more clearance than the stock BB hood.

Thanks.





[Modified by Steve Straus, 11:38 AM 3/6/2002]

 

Steve, I run a 454 in a 73. The max that I can raise the carb base under the stock hood is .850" using a spacer adaptor and a Holley Avenger with a 2" chrome drop air cleaner. This is on the stock Q-Jet manifold and it fits. I measured on the stock intake like the Holley, Weiand, and Edelbrock say to and then compared the front to back measurements with the aftermarket and with a big block, I can't see how there is clearance on the stock hood. If you can fit a air cleaner under the added height, the air flow is almost nill. You would have to use a 1-1 1/2" max and it might bump. On a 350/383 it will fit, but the BBC is too tall.

An option that I have looked at is the GM performance parts low rise, but that really defeats the purpose of longer runner lengths and equal runs. Let is know if you find another option as I would like to keep my stock hood also.

 

Edelbrock's C-66-R. Dual Quads baby! Woohoo! Your gonna need the cfms to feed that monster. Plus it looks so cool.

 

There are a lot of marine sunken big port manifolds around they don't have the correct LS6 part number so the price is a bunch cheaper but you don't care. I hope you realize how much better a factory high rise type manifold runs compared to the sunken one. I did the swap on my old 70 SS Chevelle with no other changes just an earlier manifold the difference was quite noticable.

 

Steve, you may not want to go this route, but it would be possible to fit an Edelbrock Victor Jr. under your +1.5" hood with a little work. The main stumbling block will be that the Jr. has a level carb flange, and the Vette needs a flange that tapers down toward the front of the car. The Torker's carb flange tapers down about .5" back to front, so you would have to reproduce that taper on the Victor Jr. I used a file and a belt sander to remove about .5" from the front of the carb flange on mine, and it fits under the stock BB hood perfectly. I'm running a 2" EFI throttle body, and you'll be running a carb that's probably 3.25" tall from the base flange to the air cleaner mounting surface, so you'll need the extra 1.5" from your hood. You should actually have .25" more clearance than I do (I'm around .3")

I'm running the stock L36 drop base, a K&N 2.8" filter, and the K&N Xtreme filter top. With your setup, you could probably run a full 3" filter.

-Joe

 

Steve, with your extra 1.5" of clearance, a Weiand 7513 will fit without any extra work, but it doesn't flow nearly as well as the Edelbrock. It's the one on the left below (The Victor Jr. is in the middle.)



Are you building custom headers for those new Canfields?

-Joe

 

Quote:
(but I saw an RPM Air Gap under clink69's STOCK smallblock hood fit just fine. He had a massive drop base air cleaner, but it fit.)

Key words would be "fits just fine".How does it work and what are the multiple problems created by doing this.

Even when using a KN top this doe no good with it near flat on underhood when closed.

Take a look from yesterdays post fom me about NOXRatt's problemsIn his "do I have to use an air filter" topic.Also my response in the Magazine Air filter article post although refering to Small Bock in that one,Big Block suffers same issues.Just ask Ratt.I would be willing to bet Weiand has a manifold for you.Offenhauser might be something to look into as well.The 360 Offy.

.Edelbrock is not the only one making manifolds.





[Modified by mountainmotor, 6:38 PM 3/6/2002]

 

Steve,

Are you sure they won't fit? My L88 manifold is only 1.5 inches taller than the lowrise. Your "cheater" LT1/ BB hood should work. In worst case, you might be able to machine 1/4" of an Edelbrock or other brand.

BTW, there is a clean LS6 manifold in stock at the "Corvette Clinic" here in San Jose for about $400. Not cheap, but no time wasted searching either.

Chuck

 

Fits and works. I dynoed this with and without the air cleaner on the car and only 8-10 HP difference. Thats not too bad is it? No problems here. fit with my existing drop base (LT1 style 2" drop) and down draft fuel inlets on my 770 Holly.

I think my biggest power loss is the glasspacks in the sidepipes. JCLs on the way.:D

Anyway Steve, Why would you want to go with a single plane intake? If it's mostly for street use is that what you really want? Your probably not going to be revvin that BB 468 much over 6K anyway are you? I would think a good flowing dual plane would be the ticket. I am not pushing any specific one though , whatever flows good and fits. Chris A. had a lot of info on these.

If the engine builder is going to install the engine also, He can do the fittin then. Thats what my guy did.

If you are going to do it, give me a call and I'll help ya. Took one out one of my friends 67 442 BB engines last weekend. Pretty easy...:lol:


:flag

 

(Fits and works. I dynoed this with and without the air cleaner on the car and only 8-10 HP difference. Thats not too bad is it)

Yes and no.The jetting would need to be dialed in for fair comparison.Also,it was either 8 or 10.Not 8-10 .Sounds like guessing to me.Man don't take this as a jab PLEASE! I live in a Black and White Aircraft world.No grey areas allowed there.Just trying to help.Not slamming set ups.Problem is type don't show body language,smiles on face ect. Somtimes things are taken wrong

 

8 diff in one Dyno and 10 diff on another, No guessing. No jetting changes between dynos.

:flag


[Modified by Clink69, 7:42 PM 3/6/2002]

 

You should be making somewhere around 450 hp at crank with open headers with motor dialed in

 

Steve, I have a 3x14 air filter base with about 1" drop, two snorkles with cold air ducts and a chrome top that I was using with your hood and an Edelbrock 2101 Performer on a small block. It had about 1/4" clearance.
Let me know if that will help you out.
Regards,Will

 

Just my .02 cents but there is no way a Big Block Air Gap will fit under the hood of a non L-88 hooded 69. I have the Air Gap and it is causing me clearance issues with my L-88 hood. Approx 3.5 inches from carb to hood. With my heavy breathing big block it is killing my HP, with the 2" drop base 2.81 element and extreme top.

If you are taking the time and expense to build a stout 468 don't cripple it with a crappy intake. :chevy

 

Thanks for the replies everyone, I've been busy at work, so this the first chance I've had to respond.

bigvette1: Your 73 hood is a totally different design. As far as the extreme drop base goes, this is exactly why I went with the torker in the first place. My thinking is that using a single plane rather than a dual plane is a better deal than restricting airflow with an extreme drop base.

nunus79: I had a buddy with a crossram intake with Holley 4160's on a 69 Camaro in high school. I can't tell you how many times that dual carb setup bit him in the butt. If this were a trailer queen, maybe, but not on my daily driver. They do look way cool though.

Flareside: I didn't know the flange base had a taper. I always assumed it was flat. That Weiand looks like a cool deal, I'll check it out.

Chuck Harmon: No I'm not sure they won't fit, but I don't want to go buying a bunch of manifolds to find out either. Is the LS-6 manifold oval or rect port?

flynhi: Hey Will, I don't think I want to use a snorkel style Air cleaner. I have a K&N that I'm pretty happy with. It's a 1.5 in drop base. I'm running it on my 350 right now. A few months ago I took the car out with the drop base on and ran the rpm's way up and did the same with a flat base (without the hood on the car). I could hardly tell a difference.

I'm so psyched about finally putting a big block back in the car :D :D :D

 

Steve, a couple of last thoughts on the intake. The true LS-6's were rectangular ports, not the large oval. So...

A single plane will work great from about 3000 and up. If you do not have the cam, converter (if auto) and gears you lose a lot of air flow. For street on your 468" the dual plane designs give you the best of all. Good luck, looking forward to a post of the completed project and maybe some photo's. Oh, have you tried running all of the manifold suggestions throught the Dyno 2000 program with your cam selections? Might be interesting.

 

dyno 2000 only supports Dual or single plane as inputs. Really weak in this area.

:flag

 

Steve,
Just a thought here- if you can't find an intake that'll fit under your hood(and it WILL be a challenge) you could use the TorkerII if you gasket matched it to square port heads & blended the runners up a ways. Aluminum is easy to hog out. It might be worth discussing this w/ your engine builder.

 

I'm going to try looking for a low dual plane. I do want this thing to have low end, and the more I think about it, a single plane is the wrong way to go..

Damn these low clearance cars...

 

http://cgi.ebay.com/ebaymotors/ws/eb...487997&r=0&t=0

Would that work? Can someone run the numbers on that for me?