Re: Anyone running a Weber with GM HEI
When I first got this Jeep it was bone stock. Had to run 92 octane and it was still pinging. I did the Nutter bypass and hooked the distributor up to ported vacuum. I now had more top end power and could use 89 octane with a little pinging. I rebuilt the engine (30 over, small cam) and installed the Weber. More power, better drivability, but still ran on 89 octane. I then installed a HEI distributor out of a 79 Nova. I made no changes to the distributor other than a new cap, rotor, and plug wires. With the timing set at 6 degrees, I could now run 87 octane with no pinging. I then installed the 4.0 head. Big power increase, but I did have to rejet the Weber. Still no pinging, even before I rejetted. I am not using the EGR. The Weber is big enough for me. Remember, GM put 400CFM 2 bbls on big block engines. The Weber 32/36 is a 300 CFM carb. Lower the RPMs, retime, and hook the distributor up to ported vacuum. If you are still pinging, you may have a problem somewhere else. Hope this helps.