Whats the biggest valves for 906 heads

[Charger4404spd]

Since I am considering going with a blower and that I have my heads off, I would install new valves. The 906 heads have 2.08 and 1.74 valves. Can I go bigger and by how much. I would think it would only help her breath with larger valves.

[heyoldguy]

You can physically fit a 2.25" intake along side a 1.88 exhaust in a 906. I DO NOT recommend that for your bore size and application.

I would think that for the supercharged engine I would run the 2.14 intake & 1.84 or 1.88 exhaust. But if your machinist doesn't know what to do with the seat, bowl and port, before after installing those larger valves, run the stock intake valve size and the 1.81 exhaust. Less chance of a major screw-up that-a-way.

[firefighter3931]

You can physically fit a 2.25" intake along side a 1.88 exhaust in a 906. I DO NOT recommend that for your bore size and application.

I would think that for the supercharged engine I would run the 2.14 intake & 1.84 or 1.88 exhaust. But if your machinist doesn't know what to do with the seat, bowl and port, before after installing those larger valves, run the stock intake valve size and the 1.81 exhaust. Less chance of a major screw-up that-a-way.

Good advice  The intake side will be getting some help with the blower/forced induction so leave it alone and concentate on the exhaust valve. A 1.81 stainless valve with a bowl blend should work nicely 


Ron

[Charger4404spd]

Thanks guys