[Z06] Katech Titanium/Molybdenum direct replacement LS7 exhaust valves
12-07-2012, 02:52 PM
#1
Premium Supporting Vendor
Thread Starter
Katech Titanium/Molybdenum direct replacement LS7 exhaust valves
We made these Ti/Mo exhaust valves for a race program and we could make more if you guys are interested. Don't get me wrong, I'm not saying we think there's anything wrong with the factory LS7 exhaust valves for the application, but sometimes you've got to give the people what they want. The price would be about the same as our Ti/Mo intake valve. They are 66g vs. the factory 74g. Are you guys interested?
UPDATE:
Pre-order added on post #133
http://forums.corvetteforum.com/1582592042-post133.html
.
UPDATE:
Pre-order added on post #133
http://forums.corvetteforum.com/1582592042-post133.html
.
Last edited by Katech_Zach; 12-17-2012 at 02:34 PM.
12-07-2012, 03:00 PM
#3
If these had been around a couple of months ago, I would have considered these instead.
But it is great to see that you guys have stepped up to the plate and decided to give many of us in here what we want, and that is an alternative to the stock exhaust valves.
Hats off to you for doing that.
Sounds like a good option for those who are interested. Better compatibility with bronze too.
But at least you're giving people options and that's huge.
Only thing I'd ask is what took you so long????
But it is great to see that you guys have stepped up to the plate and decided to give many of us in here what we want, and that is an alternative to the stock exhaust valves.
Hats off to you for doing that.
Sounds like a good option for those who are interested. Better compatibility with bronze too.
But at least you're giving people options and that's huge.
Only thing I'd ask is what took you so long????
Last edited by '06 Quicksilver Z06; 12-07-2012 at 03:04 PM.
12-07-2012, 03:10 PM
#6
I saw this pop up on the Katech FB feed and I had a few questions and got a few answers. Thought I'd share them.
For anyone rebuilding a head, these look like the valves to get! Count me in!
Q - I assume a set of heads would need a less aggressive valve spring to compensate for the lighter valve?
A - These lighter valves could be used with the same light spring package we use for all of our camshaft packages, or the stock springs with the stock camshaft.
Q - I also assume these light weight valves also reduce the concerns of valve float at 7k rpm, one of the main reasons why SS valves aren't ideal
A - Right. Solid stainless steel valves are too heavy which is why we don't use them.
A - These lighter valves could be used with the same light spring package we use for all of our camshaft packages, or the stock springs with the stock camshaft.
Q - I also assume these light weight valves also reduce the concerns of valve float at 7k rpm, one of the main reasons why SS valves aren't ideal
A - Right. Solid stainless steel valves are too heavy which is why we don't use them.
12-07-2012, 03:10 PM
#8
Premium Supporting Vendor
Thread Starter
If these had been around a couple of months ago, I would have considered these instead.
But it is great to see that you guys have stepped up to the plate and decided to give many of us in here what we want, and that is an alternative to the stock exhaust valves.
Hats off to you for doing that.
Sounds like a good option for those who are interested. Better compatibility with bronze too.
But at least you're giving people options and that's huge.
Only thing I'd ask is what took you so long????
But it is great to see that you guys have stepped up to the plate and decided to give many of us in here what we want, and that is an alternative to the stock exhaust valves.
Hats off to you for doing that.
Sounds like a good option for those who are interested. Better compatibility with bronze too.
But at least you're giving people options and that's huge.
Only thing I'd ask is what took you so long????
$159.99 each for the intake so $1272/set. These would be almost the same within a few dollars.
12-07-2012, 03:13 PM
#10
12-07-2012, 03:13 PM
#11
Premium Supporting Vendor
Thread Starter
Another thing I like about these is they are flat on the bottom where the factory valves are dished. Our Ti/Mo intake valve has the opposite. We lose about 1cc when going to Ti/Mo intake valves so if we do Ti/Mo exhaust valves also we should gain it back and then some. It will probably come out about positive 1cc.
12-07-2012, 03:19 PM
#13
12-07-2012, 03:22 PM
#14
But I do know the LS7 is 427.8CI and rounds up to a 428, so no surprises there. I was only suggesting that with an additional 1cc, it really would be a 428.x CI.
12-07-2012, 03:29 PM
#15
Premium Supporting Vendor
Thread Starter
Changing cylinder head chamber volume does not have an effect on displacement. Displacement is only swept volume. Volume@BDC-Volume@TDC. Chamber CC increases add to both of those so the difference is the same.
12-07-2012, 03:40 PM
#17
Premium Supporting Vendor
Thread Starter
12-07-2012, 04:20 PM
#18
Melting Slicks
Awesome! Ill go this direction for sure when I do the head work. 
Lighter, stronger and not as heavy as the SS. Im in.
Im sure a lot but what is the cost difference instead of SS or the stock Valves?
Lighter, stronger and not as heavy as the SS. Im in.
Im sure a lot but what is the cost difference instead of SS or the stock Valves?
12-07-2012, 04:31 PM
#19
SS valves are pretty cheap.
The Rev Extremes were about $325.00 for 8 if I recall correctly.
The Ferrea Super Alloys are more expensive than that l believe.
If I were doing my heads today, I'd strongly consider what Katech is offering here though.
Last edited by '06 Quicksilver Z06; 12-07-2012 at 04:36 PM.
12-07-2012, 04:31 PM
#20
Premium Supporting Vendor
Thread Starter
These will be around $1272. Stock valves are about $300. Solid stainless are cheaper, around $150-$200 I think depending on where you get them.