aftermarket valves

[Fedaykin]

Hey, I'm thinking about replacing the valves in this 95 3.4 i'm building... are there ANY manufacturers or performance shops that sell valves for the 3.4? hopefully backcut?

[StudlyCamaro]

http://www.sivalves.com/

[Fedaykin]

ordered....

is anyone running these?

[StudlyCamaro]

yes, lots of us... however not on this site ...

go here www.60degreeV6.com

[whiteThunder]

I am, think they are great. i did them with an entire engine rebuild, so i can't be too detailed for you, but they are cut smaller than the stockers have a better tullip shape for increased flow. Kinda one of those do it while your in there mods, and want as much power as possible.

[94fbody]

Hey, I just called SI Valves and in order to get a set of valves for my 3.4L, he said he needed to know my valve size/length and also something about wether it was 8mm or not, because he had (2) different valve sizes for this engine? Somebody please help? What size do I need?

[wolf]

Originally posted by 94fbody:
Hey, I just called SI Valves and in order to get a set of valves for my 3.4L, he said he needed to know my valve size/length and also something about wether it was 8mm or not, because he had (2) different valve sizes for this engine? Somebody please help? What size do I need?

tell him its the same as the large valve iron head 2.8, I also have the right part # on my car domain

[Fedaykin]

Originally posted by whiteThunder:
I am, think they are great. i did them with an entire engine rebuild, so i can't be too detailed for you, but they are cut smaller than the stockers have a better tullip shape for increased flow. Kinda one of those do it while your in there mods, and want as much power as possible.

I thought people normally go for larger valves... whats the benifit of the smaller valve? also did you weight test them against your stock vavles?

[StudlyCamaro]

i would like to hear an explination on that one as well........

[Fedaykin]

anyone?

why are the SI aftermarket valves smaller when most people get bigger ones?

and...

is there any weight difference noticed?

[StudlyCamaro]

for the record the valves that SI sells are the same size as the stock valves, going with a smaller valve would not be a good idea, not to mention pretty hard to do (adding material to the head to make the valve seal would not be fun)

as for weight difference, im not sure , although i would speculate that they are a bit lighter, ask in the pushrod performance section on www.60degreev6.com ... they are leaps and bounds better at answering 3.4L engine related questions than the people on this board