Re: Head opinion for \'89 TBI 350????
First of all, watch out for the underdrive pulleys, they can run ya a little hot for turning that water pump slower, or are you getting the high cooling pulley? I picked up a bit of power by installing dual 16" electric fans and canning the clutch fan.
I would lean toward the vortech truck heads if going with used heads. Might check out what World products has to offer, or Dart. I have been very happy with my s/r torqeurs since putting them on. If you are putting this in a suburban I would not use the Performer rpm, but the plain old performer. You would lose bottom end torque, which is very much needed in such a heavy truck. Unless you have a lot of gear, which can get your revs up quickly. What cam are you using? Why don't you send an email to Charles at camcraftcams.com and see what he has to say on your rebuild. I have been thrilled with his attention to my projects. He replies quickly, and will give you guidance on other things to help that cam work. Don't get too exited about hi-flow with a heavy truck and lose torque. What do ya do with this truck? That is the big question.