Originally Posted by
djerickd
not to mess up your plans but, I had ported manifolds once... then went to a tubular header. big improvement in driveability and power.
I would like to stay with the stock cast iron manny for heat transfer with no risk of cracking. I already went through two cracked aftermarket tubular headers on my last Suby. Plus, you can get similar gains for a lot less money with ported stockers.