white99

iTrader: (13)

I've been looking at the HS compared to the YT. I found lots of info but not really anything focused on power/rpm comparisons. Are the YT stud mounted rockers better than the HS rebuilds if I'm going to be revving the motor to about 7k RPM. I should have about ~450rwhp and 600+ on spray. I'm also going to be sticking with the stock 1.7 ratio. Any input is appreciated.

BIG_MIKE2005

iTrader: (116)

I would go with the stock rebuilds. They are cheaper & will be just fine after getting them back from Harland. Also helps to keep the valvetrain weight as close to stock as possible,

drain89

iTrader: (13)

Louis @ LG Motorsports swears by the stock rockers. Unless your setup requires an adjustable rocker you'll make more power with the stockers due to less weight. He said he's seen it proven countless times on the dyno.
I was gonna go with the YT's but after my conversation with him I'm gonna keep the stockers and get the HS upgrade for peace of mind.

white99

iTrader: (13)

Although making more power due to less weight is nice, I want the rockers to hold up. If the HS rebuilds will handle what I throw at it I'll go that route. If not I'll go with stronger rockers

MeentSS02

iTrader: (11)

The HS rebuilds are fine, but I'd personally think about upgrading to a true roller rocker if I was running a cam with some significant lift (In my mind, .590+). It'll keep the valvetrain wear to a minimum, but you'll need to make sure you have enough spring seat pressure to offset the extra weight over the roller rocker's nose.

JMBLOWNWS6

iTrader: (17)

I reconmend YT to alot of my customers and I use them on my personal cars.

white99

iTrader: (13)

The lift of the cam is .599"/.610". The springs are rated at .690". After telling HS what my set up is they said the rebuilds will be just fine. But when I asked if he's sure, he just gave me an example of someone putting down near 1000 hp with them. Here is my set up:

LS6 heads milled to 59cc
7.400” pushrods
GM MLS .51 head gaskets
Cam: 234/240 .599"/.610" 113 LSA
Diamond -2cc valve relief pistons
Compstair 6.125 rods
Stock crank
LS1 3.905 bore

I want this motor and valvetrain to last, not deteriorate in 10k miles.

BIG_MIKE2005

iTrader: (116)

After Harland goes thru them they are way better than stockers & stockers have been known to last 100k miles even on modded applications. Most people just don't like the risk the needle bearings in the stock version pose since several have failed & ruined valvetrains in the past.

If you go with the better built stockers from Harland you'll be fine & I would expect them to last way beyone 10k miles if the crappier fully stock version can last 100k miles.

Of coarse in the lifetime of your rockers you'll probably have to swap springs several times.

white99

iTrader: (13)

I wonder what kind of power level most people are at who are using the HS rebuilds

Viper

iTrader: (6)

430Hp or so here. I'm thinking of going YT ultralights next year though as they have a much better swipe pattern than stock.

white99

iTrader: (13)

What are the benefits/cons of a stud mounted rocker

vettenuts

iTrader: (4)

No question, get the YT's and set them up for the correct wipe. The stockers have a horrible nearly uncorrectable wipe pattern. The YT's that I set up on my AFR's has a wipe width of 0.045", hard to beat that. This will substantially reduce valve guide wear with heavier springs.

HP has no bearing on valve train wear.

MeentSS02

iTrader: (11)

Exactly. It is all about the proper geometry. Keep the side loading to a minimum, and your valvetrain will last as long as it possibly can given the conditions.

white99

iTrader: (13)

I'm not really how the wipe is determined or what side loading is. I've got some more research to do. First and foremost I need to get my motor back to get it put together to measure what length pushrod I'm going to need. It'll only be a matter of time before the stock RR spill their bearings.