posted March 17, 2004 11:02 AM
we are running vortec heads (5.7L 96-99). Should the old style exhaust manifolds bolt up to these? Or do we need to go to vortec exhaust manifolds and if so are some better then others?
posted March 17, 2004 11:13 AM
yes they are the standard bolt pattern, i've heard confliciting stories as to if vortec manifolds flow better than the old ones
posted March 17, 2004 11:57 AM
Didn't some of them come from the factory with tubular exhaust manifolds??? If the rules don't state cast-iron only they'll probably have the best flow...
Otherwise I'd probably stick with whatever you're currently running as they will bolt right up.
posted March 28, 2004 11:17 PM
if you are going to run vortec heads then i would get a set of the manifolds that came off of 96-2000 chevy vans they dump out 2.5 inches where most dump out 2"