Well the final decision was made and the Xmas list was submitted. I am going with the Edelbrock dual quad intake with 2 650AVS Edelbrock carbs and progressive linkage. These are going on top of my completed short block .030 454, 10:1 pistons, Edelbrock Performer RPM 110cc aluminum heads, CC xtreme splid 294 cam. Backed by a Muncie and 3:70 gears.

Anybody run anything similar to this?
What kinda performance did you get?
Dyno #'s?
Setup issues I may be dacing?
Any other advice?


Thanks

 

Two carbs, equal twice the trouble. And they will be somewhat slower than a properly thought out single 4 bbl set up. But they LOOK neat! If you want to go high tech, weld in some injector bungs, and install two 4 bbl throttle bodies.

RACE ON!!!

 

That cam is a pretty poor cam, lots better out there. Call a few of the cam companies and get a reccomendation. The dual carb set up is way over rated for difficulty. It will also make more power than a single four barrel if set up correctly, can be very streetable also. The carbs you have look like a good set up.

Lots better choices out there for heads in the same price range.

 

They can work pretty well actually. Considering hood clearance issues on a Vette....they might give a decent alternative.

I have a good friend with a set of 500 Edelbrocks on a '67 302" Mustang. He has a small factory hyd roller, a set of Twisted Wedge heads, 4 speed and 3.73 gears. It runs 12.70's all day. We've literally made laps with it at the track and it never bogs, stumbles or anything. He uses it for commuting in Houston traffic and takes long trips.

He's never done any work on them since installing them about 3-4 years ago. I've never been a fan of the AFB style carbs. Nothing wrong with them, but unless you have two of them sitting there they just look dorky. But these little suckers just flat scream.

Will a nice new style intake make more power on the dyno? Sure....but there is a cool factor to consider and the driveability of them is great as well as being very tunable if needed and reliable. And there is always the part about how we "don't race dyno's". What makes big HP numbers doesn't always go faster at the track or on the street.

If you have room, I'd try to run any spacer you could under carbs to add plenum volume and I would work on the ports as much as possible to add flow of the intake.


JIM

 

Thanks for the info guys. I am going for the cool factor first but want good performance as well. I am not a drag racer so if I loose a little bit no big deal. I have an L-88 hood so clearence should not be an issue.

69 N.O.X. RATT
What is wrong with my cam selection? I have already purchased and installed this cam. Everything I have read was positive other than some reports of lobe wiping on some of the CC cams. Also I have not purchased my heads yet but again from what I have read and been told the flow #'s are some of the best for aluminum heads under $2k. The GMPP heads are supposed to be restamped Edelbrocks. What other heads do you suggest? Why?


Thanks
Wade

 

I can understand and respect that. It will get BIG points for . Have fun, and...

RACE ON!!!

 

My bust I thought it was a tunnel ram :o Then I agree a modern single plane will make more power. As for the cam it is not that the 294 is a bad cam, just others that are better. Maybe you can get 427 Hotrod to comment on a good cam, he would know better than me.

As for the heads; there has been a lot of development in off the shelf BBC heads in the last few years. The best (In my opinion) heads out there now for a moderate performance BBC is the Brodix Race Rites or the AFR ovals. The AFR's are not availible yet so that leaves the Race Rites. If you compare the flow numbers to the GM's or Edelbrocks they blow them away, and it is done with a smaller port so the velocity will be better also. I belive they are under 2 grand.

With a good set of heads you will be able to make 500 hp very easily, probably closer to 550.

 

You are talking about the lower riser dual 4? My neighbor I ran a low riser and it worked best with a solid linkage. The progressive leads to fuel distribution problems.

The jetting and springs was straight forward. 1406's were rich out of the box

 

Thanks for the comments guys. Yes it is the low rise dual quad manifold. The operating range is between 2500-6500 rpms. I figured with my gearing in the rear, non OD trannie That would be my optimum rpm range anyway. The cam also was rated for the same range as the manifold and is a solid grind.

69 N.O.X. RATT,

Who sells the Brodix race rites? Do you have any links where they compared these?

Thanks
Wade

 

Check Brodix's web site, Brodix.com. I have their catalouge and they list the flow 's as

.200 154
.300 221
.400 274
.500 316
.600 335
.650 340
.700 342.

They also have a CNC version that adds 5-10 cfm.

 

As John said, it's not that the 294 is a bad cam, but there are much better out there IMHO. I consider it a good baseline cam....but why not pick a better one right up front? Since you already have it...it will do OK....I think Bence here on the Forum was hitting low 12's with it in his 454 and iron oval ports with a 4 speed and 4.11's.

First off, you're my kind of guy for using a solid lifter cam. Definitely the right choice. I have a couple of favorites over the years, they always work well, but there are better these days.

Just for fun last summer I threw and older design Crane bracket cam in my 540 and though it was definitely down on power from the previous .731 lift solid roller, it really ran much better than I expected.

You can easily move into the bracket race type cams and they will live well. I can't imagine ever really wanting to put less than a .600-.630 or so lift flat tappet in any big block with any head. No issues with longevity in that range. Just get the right springs. You might also check into the lifters with the EDM laser hole in the face to provide oiling directly to the lobes to increase life. Make sure you usea HV oil pump with them as they will lower oil pressure at idle.

Comp makes some great cams, as well as Crane. You're in the ballpark on duration...but a 250-255* range setup will do fine with your gearing. Again get up near .600 or so lift.

I've been using Engle cams the last few years and have had fantastic luck. Mark Engle takes the time to work with you and get what you need.

I would also check with Harold Brookshire at Lunati. He has some new lobes coming out that look very interesting.

On heads, I REALLY think there are better heads out there than the GM/Edelbrock ones. They just don't flow what other stuff does. The Race Rite Brodix do look great. Check with Mike Lewis at Mike Lewis Racing and see if he can't get you a good price. He has been doing very well for Forum members lately. The 305 or 315 CNC AFR's will also do very well. There a couple of guys here that have them on everything from a 454 on up.


JIM

 

Awesome info guys I really appreciate it. This will be a post I will print out for future reference. Since the 294 is already installed I will go with it for startup and then a little while after to get the feel of the car again. Then I will look at the cams you guys have suggested. I also will check on the other heads you guys recommended. If they are at or very close to the Edels\GMPP's in price I will definately look into them hard.

Thanks again for the great info!


Wade

 

Jim,

Is this Mike's website?

www.lewisracingengines.com

 

I went over to find out exactly what's on the neighbors 427 bbc. +.060 10.8 compression as setup.

It's dual 500 cfm Edelbrocks on top of the Newer 24 degree Victor jr 300 cc rectangular ports 2.25/1.90 2 1/8 SS headers. Lumpy solid lifter cam. He wasn't sure of the specs. He said that he never got a cam card from the engine shop they just told him that the lash was .018/.022 Lunati roller rockers. So it probably is a lunati cam.

It's a bad 66 malibu th400 with 3.36 rear

 

Advice: Install a larger gas tank.

 

Yes that's him...great guy. Tell him Hi for me!


JIM

 

i'd be real obliged if you would let me know how it all works out.I'm building a similar engine. 496 with ported pro topline heads. going for 10 to one or so pistons. haven't decided on a cam but i have ordered an Offy hi rise dual quad. yet to pick out the carbs but holleys wont fit so...my car has a TKO in it with 3:90 rear

 

Not really sure what the plenum area of the Offy looks like, but *if* it was open...I always thought a low rise 2x4 setup would look cool with two Holley DP's turned sideways like on a Tunnel Ram installation and using the heim joint tunnel ram linkage. It's one of those things I figured I'd work out someday just for the *wow* factor!

JIM