Discussion in 'Fox 5.0 Mustang Tech' started by 89llx, Jul 8, 2010.
I have an 89 stang with hci and sc with 10 psi, should my stock ignition be ok?
I still run a stock ignition and have been to 20psi. and been 10.30 with it I do have the plugs closed up to around .030 though. But it will not hurt to move up at all and would probably make a bit more power with the S/C and burn cleaner.