I know that it is recomended for the computer controlled cars(at least fuel injected) to have an lsa of at least 112. I was wondering if this is true for the cc carbs as well. I am looking at a compcam. I will be running it in a 350 with ported and gasket matched 305 heads(for the time being) and I am using a stock style gasket matched stock style alum intake. I will be running hooker lt headers and probably true duals. I am putting a 3.45 rear in the car as soon as the guy gets back in town so I can pick it up. The tranny is a 700R4 that has been rebult and has a shift kit and corvette servo. I am planning on putting a stall converter in it(possibly just s-10). If I dont need one specifically for the computer controlles I was looking at the magnum 280h part number 12-212-2. It has 230 duration at .050, and .480 lift w/ 110 lsa. I was also looking at their next smaller cam. Any info would be appreciated.

Thanks

Ben

 

I just happened to stumble on this post, but here's what you need to know about the computer controlled carb....

1.) You cannot program chips for it. Noone has defined a bin editor for it

2.) You don't need to burn a chip for it. Unlike EFI, CCCS does not extract fueling information from tables (at least not in any conventional way as related to EFI) Basically, it's still a mechanical carb, the only difference is the mixture control solenoid controls the dwell on the primary metering rods. Open loop is a constant dwell number (10% duty cycle), so there is nothing you could gain in teh chip here. Closed loop the ECM varies the dwell to keep the O2 sensor happy. Again, this is a direct feedback loop, nothing you cold do in the chip here either.

3.)CCCS is very stupid and doesn't care what you throw at it. I've seen CCCS run fine and not set a code on a 305 w/ a comp 280 magnum cam in it. If 10" of loping vacuum works, then.....

4.) The only thing you need to be able to play with but can't is the timing curves. If it really urks you to not have control of this, there are a couple of ways around this. You could always run a mechanical distributor and simply fool the ecm into thinking there was a computer controlled unit by running the tach signal into the ECM as the dist. reference signal. You could always adapt a TBI 'puter to run as a stand alone timing cntrol unit as well. You'll have to do your own legwork on specifics with these. I'm not 100 % sure what voltage swing and waveform the ECM expects on the dist. reference line, so some adapting might be needed here. As for using a stand alone TBI puter, well that has plenty of issues that need to be thought about.

And thats all you need to know...

 

Thanks for the help, now I know everything. Actually, I know that this is not the right board, but since I have already listed what I am planning on running does anyone have a suggestion for a cam?

Ben

 

Edelbrock used to sell a "Torquer II" hydraulic flat-tappet cam and intake manifold package that ran really well under either Quadrajet or Holley carbs. It had a nice, lumpy idle and was optimized more toward the 3000-6000rpm range. Pulled decent mileage on the highway also.

See if you can find specs on edelbrock.com and use it as a data point.

 

Thanks for your help. I really appreciate it.

Ben