I have contacted S.I Valves, and they said they can make the 2mm+ intake valves at a cost of 30 dollars a valve. I just wanted to confirm that the valves WILL fit with the required machining? Would I need to get the valve seats pulled and machined for larger valve seats? Or will the 2mm+ intake valves fit. I dont want to spend 120 bucks on 4 valves, only to have a very poor paper weight. Thanks!

We needed to replace the valve seats for the OS intake valves in my 2.2 head. The exhaust seats worked ok with the 1mm OS exhaust valves.

-->Slow

Was that the 1mm+ or 2mm+? How much was it to get them replaced?

I looked back at my notes and it turns out that the intake valves are 3+mm os. Start from here and you can see what I've done so far including prices and part nos. The guy that helped me build the head said he'd do another for about 3 bills for anyone who wanted, providing they supplied the parts. The main difference is that I built a 2.2 head which is a little different from the 2200 head.

-->Slow

Im building a 2.2 head aswell. So for the 2mm+ it would fit? How much of a difference would i notice between 2mm+ and 1mm+ oversized valves?

Sorry about the confusion. I seem to remember someone else popping up here recently talking about OS valves for the 2200.

Sorry, I can't tell you the 2mm OS valves will fit. I'll bet they'll require larger seats, but it takes measuring to know for sure. I don't remember any of the values we measured when mine was done.

If you're spending $$ you're probably better off going larger on the exhaust valves. As far as how much difference the larger valves make , that's what I was hoping to determine by sending a stock head and my OS valve head to a guy with a flow bench. Unfortunately, he's put 'em on the way back burner and I haven't heard anything in quite a long time. The truth is, without some type of porting you're going to run into a limit with head flow no matter how large the valves are.

-->Slow

I was planing on going 2mm+ on the intake, and 1mm+ on the exhaust valves. With 1.6 roller rockers, the GMPP ls6 springs, and a P&P'd head. Then getting a cam regrind. Im beginning to think the 2mm+ intake would be more trouble and money then its worth. 4 of the intake valves alone would cost about the same as the 1mm+ intake and exhaust valves would shipped! Then i would still have to get the 1mm os exhaust valves. Im not planning on extreme power, but would like to get low 15's n/a. That would put me at around 150-160 hp at the wheels. The head work, with a full exhaust and 10:1 compression pistons with the cam regrind should put me there easily. How much extra horsepower power would that extra 1mm give me? I cant see it being anymore then 5-6. If it would fit in the stock valve seats, i would probably do it. But if i would have to get the seats pulled, i think the costs would outweigh the gains.

steve white wrote:I was planing on going 2mm+ on the intake, and 1mm+ on the exhaust valves. With 1.6 roller rockers, the GMPP ls6 springs, and a P&P'd head. Then getting a cam regrind. Im beginning to think the 2mm+ intake would be more trouble and money then its worth. 4 of the intake valves alone would cost about the same as the 1mm+ intake and exhaust valves would shipped! Then i would still have to get the 1mm os exhaust valves. Im not planning on extreme power, but would like to get low 15's n/a. That would put me at around 150-160 hp at the wheels. The head work, with a full exhaust and 10:1 compression pistons with the cam regrind should put me there easily. How much extra horsepower power would that extra 1mm give me? I cant see it being anymore then 5-6. If it would fit in the stock valve seats, i would probably do it. But if i would have to get the seats pulled, i think the costs would outweigh the gains.

If those are your goals, the +2mm valves aren't worth the cost. You can achieve those marks easily with the +1mm valves. Also, I get custom Ti valves for less than $30 each, and from what I've heard from the big HP scene out here, SI quality has gone down the drain recently (although these are 1200+hp big blocks, but still the same company).




fortune cookie say: better a delay than a disaster

I definitely agree with Notec. Low 15's is definitely possible without the valve upgrade. Look at some of the cam grinds Madjack has suggested for nice midrange and top end power.

The cheapest OS valve trick I can think of is to open the exhaust guides to 11/32" and install +.100" long 1.60 SBC exhaust valves. You can find those valves fairly inexpensively, and the total cost to install 'em including seats is probably less than buying the SI custom valves.

-->Slow

Yeah, your goals are kinda low for +2mm Steve. I definitely think the +1's are worth it, but another mm on top of that might shift the powerband higher than you'd like. Mind you, that's purely conjecture, and if you want to experiment, then more power to ya! I think for NA though, 2mm oversize is probably more for a really wild, 10.5+:1 compression, wicked cammed build, not so much for a relatively mild street car. Of course you could always aim higher




Arrival Blue 04 LS Sport
Eco
Turbo
Megasquirt
'Nuff said

Well, I could aim higher, and would hit low 15's easily. I want to build my engine to be a sleeper. Thats the whole point of doing a ohv anyways I guess, no one expects it to go fast. I dont really mind spending the money to get top quality and best performance. I'd like to get the best I could on a cam regrind, oversized valves, 1.6:1 roller rockers, and the ls6 valve springs. Would i need to do the hybrid lifters for this? I would like to see 14's. The skys the limit.

I just ordered the 1mm+ valves from aaron @ turbo tech racing and got a very good deal on them. Now im looking for the valve springs... Im thinking about the GMPP LS6 springs. They are on ebay for 56 dollars a set, which is just about the best price i can find for them. Anyone want to split a set with me?

do those springs work for the 2200 also and would they be stronger than stock

They are stronger then stock, but require taking .090" off of the spring seat on the 2.2 ohv. For the 2200, i think you have to take .20" off the spring seat, which is a nice bit. I dont know if anyone has tried it yet, might work, might not. These are much better then stock. Allows more lift, and higher rpms.

steve white wrote:They are stronger then stock, but require taking .090" off of the spring seat on the 2.2 ohv. For the 2200, i think you have to take .20" off the spring seat, which is a nice bit. I dont know if anyone has tried it yet, might work, might not. These are much better then stock. Allows more lift, and higher rpms.

I'm picking up a 2200 head next week to drag over to the machine shop and try the .2" mill. I may be willing to go in on a set, but it depends which set you get (LS6 had 2 versions...one sucked lol).




fortune cookie say: better a delay than a disaster

Im looking at the yellow ones. I think thats the second version. The first was blue?

steve white wrote:Im looking at the yellow ones. I think thats the second version. The first was blue?

Yes, blue stripe FTL. Ebay link?




fortune cookie say: better a delay than a disaster

Here ya go
Would these work with the crane gold 1.6 roller rockers? I've seen peole have clearence issues with some of the different springs and rockers

steve white wrote:Here ya go
Would these work with the crane gold 1.6 roller rockers? I've seen peole have clearence issues with some of the different springs and rockers

Those springs look used?
Clearance issues only occur with aftermarket locks and retainers. The stockers can be used with the LSX springs, so no problems there.




fortune cookie say: better a delay than a disaster

It doesnt say anything about being used, but the do appear to be. I asked them if they were new or used just then. There are other places to buy them for around the same price.

gmpartsdirect.com has them for 47 dollars. Probably the best way to go.

IIRC GMPD rapes you on shipping.
These are cheaper than the LPE's after shipping (at least to my house).




fortune cookie say: better a delay than a disaster

They dont ship to canada. So if we are going to get them, they'll have to be shipped to your house.

steve white wrote:They dont ship to canada. So if we are going to get them, they'll have to be shipped to your house.

Works for me. That'd probably be better anyway so that parts don't have to cross the border twice.




fortune cookie say: better a delay than a disaster

Did you get the spring seats machined after? How did it turn out?