Tuning on a procharged 502
 

What is the best plug,gap and heat range to run on a P/C 502 mag?I searched and couldn't find anything.I know your out there Smitty, Chime in! Thanks.

Re: Tuning on a procharged 502
 

mark @ precision 504 469 7463

Re: Tuning on a procharged 502
 

I always ran ac43's at .040 w/msd 6,the 42's were just too cold(always fouled). If your not running over 6 psi boost you could go .045 w/msd. If ign is stock,keep it at .035. I could never get the plugs locally :drink: that procharger reccommended,ac's are cheap. I also run 10 degrees base timing,not 0 or 4 but crockett's program pulls timing out under boost. I am getting ready to dyno 540 w/ the m-3 on it,changed cams,freshened motor,heavily modified mpi intake (just finished today,converted to twin efi rails and 63 lb injectors),went to cnc'd afr heads,had new pistons and chambers&exhaust runners thermal barrier coated ,i hope to see 850 plus hp,i will post a thread soon on the rails and some of the mods,etc,Smitty

Re: Tuning on a procharged 502
 

http://www.offshoreonly.com/forums/s...highlight=plug


http://www.offshoreonly.com/forums/s...highlight=plug


http://www.offshoreonly.com/forums/s...highlight=plug


http://www.offshoreonly.com/forums/s...&pp=25&page=11

Re: Tuning on a procharged 502
 

Thanks guys. I was beginning to think no one was going to talk to me. I'm running the ac 43t's my gap was a little high and I was getting a high rpm misfire. Smitty, I swear I'm going to have to ride in that dangerous sob one of thes days. 80 mph is scary in a 272 I can't imaginehow yours is going to be. Stay safe, Ken.

Re: Tuning on a procharged 502
 

Misfire? Probably because of big plug gap BUT-pull cap and rotor and inspect,my original distributer looked like it had been under salt water inside(green,corroded,literally had wires crumbling off pickup) after 3years and my new msd after 2 years looks just as bad,i don't run in salt water and my engine compt stays pretty dry!!! Smitty

Re: Tuning on a procharged 502
 

Mine looked like that after 1 year. I have heard this is problem with MSD. Last trip out with first year on Distributer engine started miss firing. Went & pulled cap was suprised how bad it looked.

Re: Tuning on a procharged 502
 

My stock distributer and msd both looked this way after no real time,the thing i can't figure out is water doesn't really get near my distributer! I used to mud bog a jeep and never had a distributer look so bad inside,Smitty