Thread: Supertech valves

Im looking at buying a complete set of supertech stuff. +1 and +2 valves , twin springs titanium retainers, and guide seals

Few questions i hope someone can answer.

Will the stock valve seats go out to the +2 exhaust valve ok or will i need new seats

How bad is the shrouding of the valves at +1 and +2

I see there is 3 different spring options. I always worked off 80lbs seat pressure at installed height + what ever boost pressure you're running. so 80 + 20psi = 100lbs spring pressure. I see Supertech come in 93, 123 and 138lbs. I think the 93 will be too light and the 138 too heavy.

Anything else i should know?

And finally i did a quick price from the local dealer and it would be almost 1/2 the price to buy it ex US and freight it. So can some one recommend a trusted dealer State side?

Ta
Cy

No info, no one on here has any idea or an opinion? come on people..................

Since I haven't upgraded to bigger valves yet I can't be 100% sure. I would think the seat would still be the same size since it's just the head of the valve that is larger. I run the 123lbs springs on my NA motor Im sure they would hold up for boosted too. Dealer? you can try Gspec.com for OEM stuff Mazworxs has pretty good prices on stuff too.

when my head was worked with bigger valves i had new seats put in.

Stock seats will be fine. The max is +2 on the exhaust.

depends how you cut the seats. Fo max potential from the +2 you need new seats, but you can still get big benefit on stock seats