Quote:
Originally Posted by JerzLT1
Max ported heads actually arent a good idea because it is a porous metal and coolant can seep into the cyls. (ask me how i know  ) but the idea behind the max flow that you can get for less restriction is definitely a good idea |
Max port and use a quality porter this time!
To keep the volocity up during "normal driving" GTP did my heads basically as a stage 2 intake port, had the intake port runners matched to the heads/ Gaskets, then reworked the bowls, and did his stage 3 exhaust. Also went with the 5 angle, backcut and swirl valves. His stage 3 would have reshaping the runners, as opposed to just opening then up a bit.
Idea being, going to big on the intake side could hurt volocity / throttle responce when in the lower RPMs without boost.
These are stock heads. I've seen aftermarket heads make big gains over what I have, but back in the day when I did my first heads/cam I had GTP do the stage 2 for N/A, There weren't allot of options other then LT4s and Canfields so later when I added the blower I just sent them back for additional work.
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
Last edited by Pampered-Z; 11-30-2011 at 05:30 PM.
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