MEM 302 5.0L

performance wise im pretty sure it hurts it...but not too much.

91camaroeater

i would do a chip and dyno tune and have the timing set through the chip. it will run a lot better then guessing, plus you will get a lot more horsepower from doing that. i just had mine tuned and i gained over
30 hp and 30 lbs tq just by reducing the timing by 1 degree