ShoddyHog

iTrader: (1)

Can I get your thoughts on installing L92 heads with a ported LS3 intake on a stock LS2 short block with a StreetSweeper-HT cam? Cam specs are 228/232 .612/.600 111.

With stock heads, inktake, and my tune the car drives in rush hour traffic like it is stock, yet lopes real nice, and put 415/395 down on a dynojet. I'm replacing the heads because I was replacing the springs and found I'd almost dropped the #7 intake valve...and the valve stem is F'd. So...I've decided to do my next round of upgrades:

LS7 lifters
Yella Terra rockers
Heads - (ported 243's or the L92)
Ported Intake (was thinking of ported LS3 intake for the L92)
Ported throttle body

Thanks...and most important to me is to NOT lose all the driveability and midrange torque I have now.

Gerry

99blancoSS

iTrader: (115)

We just speced a cam for this very same application, 05 gto. A 224/232 113 +2 is what we ground for our customer. Daily driver and didnt want to give up any low or mid range torque and hp. He has his chpice as well with a 224/224 or a 227/234, I honestly think 224 is the biggest you can go without sacrificing bottom end. Especialy with those big heads.
Would be good to see your results though. We offer custom ground Comp cams for $370 and I have that L92 grind in stock right now.

ShoddyHog

iTrader: (1)

No way you're going to talk me into taking out the StreetSweeper-HT. I love that cam...and if the heads won't work with it, then I'm going to get a set of ETP ported 243's.

Gerry

Jason 98 TA

iTrader: (4)

Sounds like the car is making pretty good power. You might consider the PRC LS2 cylinder head setup. You could have your heads ported, valve job & milled for $650, or go outright with the stage 1 or the stage 2.5 PRC LS6 heads. We're currently offering $100 off any PRC heads!!

http://www.texas-speed.com/shop/item...d=649&catid=20

or

http://www.texas-speed.com/shop/item...d=134&catid=40

ShoddyHog

iTrader: (1)

Well guys, it's all over but the crying. I gave up on finding the answer to whether this cam will work with the L92 heads, so I told myself, "Self, there ain't but one way to find out."

I've got a set of L92 heads on order from Texas Speed. I'm also getting a ported LS3 intake, and stage II ported tb from Cory, and also LS7 lifters, new lifter trays, and Yella Terra rockers.

Got the heads off today. Man...the GTO must be the easiest car I've ever worked on in my life. I'd hate to do all this crap in a F-Body. You guys have my sympathy

I hope to put her all back together next weekend.

Gerry

GTbrunO

Good luck, I am interested to see the results.

Blindmelon

Piston to Valve clearance is a issue clay them if you don't believe me. Cam is too big
for street car & won't be fast on that heavy of a car in the 1/4 mile.

ShoddyHog

iTrader: (1)

Thanks. I checked with Texas Speed, gave them my cam specs, and they said that with the porting, I will have sufficient PTV clearance.

I plan to clay them for peace of mind just to make sure.

Gerry

WKMCD

iTrader: (2)

The L92's have a lot of valve drop. Your cam doesn't have that much overlap. I've run cams with 19, 13 and 11 degrees of overlap with the L92 heads milled .030 and Cometic .040's. You will be fine.

ShoddyHog

iTrader: (1)

So I shouldn't have to clay them then?

Gerry

WKMCD

iTrader: (2)

I'd clay them anyways or check them with a dial gauge but I'd bet dollars to donuts your fine.

edcmat-l1

iTrader: (10)

Depending on the lobe, you should be fine with a 228 and the L92s. If it turns out you have more than enough, mill the heads some. Get some free compression out of it.

ShoddyHog

iTrader: (1)

I have a couple questions on claying:

1. I use the new intake gaskets (stock) or the old ones (stock)
2. Torque down completely to spec, or just tight?
3. What kind of clay?
4. Do all the pistons, or just one?

Thanks!
Gerry

WKMCD

iTrader: (2)

Gerry,

You don't really need to use the gasket. Compressed figure .053. Snug the head down without the gasket and add .053 to whatever measurement you get. Modeler's clay will work fine. One cylinder is fine. Any variance is only going to be .001 - .003 or so.

ShoddyHog

iTrader: (1)

Thank you for the quick reply!

Gerry

ShoddyHog

iTrader: (1)

Question. Doing the L92 swap with Yella Terra's, can I assume I can se the same length pushrod? If so, then go ahead and check PTV before checking lifter preload?

Thanks!
Gerry

p.s. Just got done making my solid lifters

ShoddyHog

iTrader: (1)

I believe you now.

Gerry

ShoddyHog

iTrader: (1)

For the record...with the head snugged down and no head gasket installed, I started to rotate it around...felt what I thought was resistance, so I "started to stop" for lack of a better way to say it. Pulled the head off, and can see where it just peeked through the clay on the intake side.

Gerry

edcmat-l1

iTrader: (10)

OK, First off, you're probably checking it wrong. You need to use checker springs installed in place of the valve springs. Then, you need to use a checker pushrod and carefully adjust it until there is ZERO PRELOAD, AND ZERO LASH. THEN you check your PTV.
If you're not doing this set first, you are most likely either preloading the lifter, or holding the valve open slightly to start with. Either one will skew your results.
That cam, should not be too big for that application. Although it does depend on the ICL, and the type of lobe. But, all that being said, it shouldnt be too big. Trust me on this one.

OK, to elaborate, without the head gasket, and depending on the length of the pushrod, you may be hanging the valve open to begin with, effective subtracting however much its open, from your true PTV.
Additionally, the valve spring can slowly collapse the lifter, as you're turning the engine over by hand, collapsing it even more, if its not already bottomed out.
The bestest, most accurate way, is to use the head gasket (either one, its only a dif of a .001 or .002, dont both torquing) checker springs, and a checker pushrod, adjusted so there is ZERO PRELOAD AND ZERO LASH.
Once you've determined your PTV, the lifter preload has no impact on it, once you final assemble it.
HTH. If you need personal assistance call my shop, I'll be here for a while. Or leave a message and I'll get back to ya later today.
757-424-1740

WKMCD

iTrader: (2)

My 19 degree overlap cam was not a problem with 2cc valve reliefs. Can't see this here but I've beenwrong before.