NorthernC5

What is the best choice exhaust valve for 650rwhp supercharged LS3? Was looking at manley extreme duty but too much money at $400+ for 8. Any other good choices?

Have Ferrea hollow steams for intake.

Forcefed86

iTrader: (4)

Stepping up to a larger size valve? If not, the oem valve is more than adequate.

The Alchemist

iTrader: (19)

The exhaust valve on a supercharged setup doesn't have the same needs as in a turbo charged setup. The exhaust valve gets much hotter in a turbo setup because of the restriction in the exhaust that keeps the heat higher.

NorthernC5

So Ferrea 6000 or Manley severe duty? Bought new un-assembled heads...

Realcanuk

Using Ferrea 6000 intakes and Ferrea super alloy exhausts here. That's what I was recommended at the time.

LVTUNER

I use Precision SS valves in my turbo engine. I would not use the OE valves and high spring pressures. Every used stock head you take a part has no margin left on the intake valve with 80-100# of seat pressure. Now increase that to 135# to 155# on the seat with more open pressure and a higher lift cam. How long will that last. Just my .02.

LJMSJohn

Absolutely no need for Ferrea valves in that application. The stock valves are more than adequate.