I can't figure out this EFI thing so I think I'm going to try a carb out. Currently the car is 383 with HSR and Trickflow's. I'm going to use a loner Edelbrock Preformer for the time being to save some money but I have a few other questions...

1. What carb should I look at? Double pumper? Vac Secondaries? I'm thinking a 750 would be about right. I don't really need a choke due to a weekend only car.
Also, is the performer a square bore or spread bore?

2. Should I get a small cap or large car dizzy? I currently have a 6AL and am obviously running the remote coil.

3. Should I get a Vac advance dizzy or what?

4. Finally, what gaskets do I need with the Performer intake? I know this has coolant crossover the HSR does not.

TIA!

 

1. I'd recommend a 750 DP minimum; maybe 800 or 850, depending on the intake you use. The Performer intake has both bolt patterns. Spreadbore carbs fit it better, but either will work. An intake with a tiny plenum and small runners like that, will tend to want a larger carb, because the "pulses" of intake will not be averaged or smoothed out by volume; meaning, the "VE" equation you'd use to calculate carb size, doesn't really quite apply. The carb will see FAR HIGHER flow rates than the steady-state value the equation gives, at the peak of every pulse. A good choice, one I've used on larger motors with good success, is the Holley 6211.

2. You HAVE TO HAVE a vac advance distributor since you won't be using the ECM. AFAIK there's no such thing in the small-cap form factor. So you don't have alot of choice. I'd suggest one of these.

3. See #2

4. 1204; or the stock FelPro for a SBC (MS90314). Coolant crossover doesn't really matter.

 

Thanks for the help, again

The reason I brought up the dizzy was because I was thinking about this for a dizzy...
http://cgi.ebay.com/ebaymotors/ws/eB...MakeTrack=true
Says it has no vac advance. And I didn't know if I would run into problems wiring up the small cap dizzy.

 

I am running a MSD Probillet I think the part # was 85551 or something. No vaccum advance either. Runs just fine.

If you are going to run at the track much, go for a Holley HP series carb. They have a street version with all the vaccum lines for the brake booster.

I am running a Performer RPM airgap and love it. I pulls strong through the entire power range. The cam I run is the xr282hr.

 

No vac advance = no additional advance when cruising down the highway; will significantly lower the gas mileage.

I would not do that, except as a last resort, or of course on a track-only car.

Most distributors that don't have vac adv, also don't have centrifugal advance. Most but not all, as evidenced by that ad. Here again, that doesn't work well on the street, for a variety of reasons. The only way to make that work right is to set the static timing to the value that you want for high-RPM WOT operation; usually something like 36° advanced.

The eBay dist would work well for the strip but is not a good setup for the street. With as small a cam as you've got (wasn't it something like 230°/236°?), you WANT and NEED vacuum advance on the street. You can "get by" without it, and it will "work fine", as far as just working goes; but it will not be the best that it can be.

When they say "serious cam" in the ad, they're talking about 275° @ .050" solid rollers. Race stuff, not FI-compatible street stuff.

If I was in your spot, I'd sell the 6AL and get the DUI, and move on.

 

Eventully if this Trial carb swap works out I want to get a decent manifold and a muhc better carb but for now this is trying to get done as cheap as possible so when I find out I have bigger problems I'm not out a ton of money. I want an AirGap like you have and a Deamon carb.

I know I should go with vac advance anyway I just need a cheap but decent dizzy. No used stuff anyymore!

Whats this DUI business and why would I want to sell my 6AL?
I'm not giving up my ignition box so I can get drunk and drive around

 

Check out the link, the word "these" up there at the end of answer #2 will take you there... basically with that, you don't need the external box. Less wiring, less stuff to fail, less clutter.

You'll find it's actually a device for shocking yourself when you get drunk.

 

I understand having a budget.

Jegs and Summit have there own HEI's they sell for a good price. You can use your 6AL box with the HEI, you just have to wire it up correctly.

Dont skimp on a part that you can carry over from motor to motor.

Most guys around here have better luck out of Holleys over the Demons. Its been proven at the local track over and over again.

If you have any questions about changing to carb, PM anytime.

 

I agree about the Holley/Demon thing; while the Demon is a better design and cures some of the inherent problems with Holley carbs, they seem to have been plagued with SEVERE quality control problems. If you decide to go that route, buy it from somewhere reputable, with a warranty, so that if something isn't right, you have some recourse.

 

I think I'm going to go with a reman Speed Demon 850 DP. Its from eBay but seller has 100% feedback and this comes with the warranty and the tuning DVD. Also has a line kit and a fuel press gauge. Hopefully this will last for this motor (if it runs) and my next motor (when it doesn't run)!