Tech / General EngineIs your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!
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I have 11.5:1 compression and a MSD pro billet distributor with 6al box. What should i gap my plugs at. Also I have an automatic trans and Ive heard that a vacuum Sec. carb is better then a DP for auto. What do you think? I have a Holley 650 DP with a proform center section and a Holley 750 with vacuum sec. just curious on which would be better for my application
That's a lot of compression. I'd start around .035" (always a good starting point) and then maybe try to go up a little from there. .045 max, I would think to keep from chewing up ignition parts on a regular basis.
I have a similar setup and I gap my plugs at .040...so somewhere around .035-.040 is a good starting point. I would definately not recommend a vac. secondary carb for your combination, go with a mech. secondary dp carb you won't be disappointed.
I was going to gap them at 45 and use the DP, but i called summit tech line to see what they suggested. They told me to gap the plugs at 55 and use a Vac. Sec. carb. I wasnt sure if that would be right so i posted up on here.
Normally double pumpers for automatics are not recommended, due to throttle issues at low rpms. Since you have an aftermarket stall (Jegs 3200-3600 stall). I do not see any problem with it. I plan on running a 750 DP on my new 383.
