916LS1

iTrader: (4)

I'm at the point where I would like to strengthen/smooth out the valve train by replacing the stock rockers with roller rockers. It would be great to pick up a few house power on the way. I'm thinking about the Yella Terra Ultralites. They're only $383 at Byunspeed. So my questions are:

Will I have the clearance?
Will I pick up a few HP?
What would this bump my lift to from .581?
How much will the effect my smog emissions?

02silvaZ

iTrader: (12)

ur lift will climb to about .615 so clearance will be an issue i would assume, you will gain some power but i dunno about the emissions part

01ssreda4

iTrader: (96)

NO, NO, NO. You won't be "smoothing" out the drivetrain. That cam is designed for stock ratio rockers and says so right on Thunders site.

garygnu

you are better off getting the comp trunnion bearing up grade for stock rockers.like stated above the at TR state don't use 1.8 rockers.he knows his stuff,listen to 01.

916LS1

iTrader: (4)

Thanks guys, good info!

dr_whigham

iTrader: (49)

Why not just get the 1.7's?

916LS1

iTrader: (4)

I figured since I'd be spending the money anyway, why not try to achieve more lift for more power.

DONAIMIAN

iTrader: (18)

The higher ratio rocker would also have an effect on the ramp rate of the lobes. You would need a spring that would allow more lift along with high pressures.

01ssreda4

iTrader: (96)

That cam is designed around the stock rockers. The higher ratio rockers are more designed for stock type cams. Big difference.