Well I decided that I am going to change my setup on my new motor Im building. Its a 383ci with a Eagle 4340 Forged Crank, Eagle 5.7 H Beams, I will be taking the srp flat tops out and replacing them with some custom -39cc Dome pistons from Diamond and some total seal ap series rings. That will put me at 8:74.1 so that should be a good ratio to run at the amount of boost I am wanting to run. Im looking to run 20-25psi tops, and then lower boost when just cruising around. I will also be putting arp head studs in so no lifting heads happens. Now for the head gaskets.. I was told that running the Cometic will be the best. I just had my short block built from the machine shop and my block was zero decked so I don't know what the RA finish is. Can I bring it back up there and they can tell me? What about the heads, do they have to be 50RA or finer also? For the ECM. Can the ecm on a 93 car handle all the fuel adjustments and timing adjustments etc? Or do I have to run an aftermarket computer?

 

As for ECM, it can handle fueling and timing, but it wont be optimal. Once your hit positive manifold pressure (boost) things get complicated. Timing will only support from vacuum to 0psi gauge pressure. Once you go into boost the ECU will refer to the timing in the last cell. This means you will not have adjustments for playing with the timing during boost unless you get an aftermarket ignition system with boost retard (like MSD or Accel). The fueling will be blind as well, but can get pretty close with a WB. many people run boosted applications on here with stock ECU. Contact Alvin at pcmforless as he specializes in 93' ECU's.