Who said Z6 has bad flow? The Y8 has bad upper RPM flow compared to the Z6.wow u guys know what you are talking about , now i know that the y8 has "quench pads " and that the z6 has bad airflow, i never knew any of this until now but i will get learning and taking notes,
so to me it's pointing towards the y8 so far
i will be adding a y8 intake manifold on anyway to help with the swap, so if i get a y8 head it will match ok right along with a p2p ecu???
Using a p2p ECU is one way (perhaps the best) to activate VTEC, and yes it'll work with a Y8 IM. You'll have to convert to a 2 wire IACV on the IM or remove the IACV, plug the holes, and continue to use your 3-wire on the IACV on your Y7 TB. It might also be a goos idea to use Y8 injectors as the fuel maps in the p2p expect them.i will be adding a y8 intake manifold on anyway to help with the swap, so if i get a y8 head it will match ok right along with a p2p ecu???
You wouldn't have to go obd1 because of a z6 head. The y8 dizzy wouldn't bolt up though without cutting one of the legs.Forgot to mention the ports oops. The Y8 has swirl type intake ports to promote better air velocity which is helpful at lower rpms. The z6 has straight or equal ports which is good at high rpm <-- Couldn't word that properly. I'll try and dig up a pic of the two heads or if someone has it linked maybe they can post it up.
Go with the Y8 so you don't have to convert to OBD1, timing gear problem because of the keyway, there are other small things that you can read all about in write ups. Basically your car will run like a factory vtec Y8 whereas if you toss a z6 head up in there it'll cost you more and it won't run as well without some tuning atleast.