5.3LJimmy

iTrader: (10)

If you have a straight spring(not beehive) on there now then you will need to get a set of stock or titanium retainers to fit the 918's. But personally I would use a dual spring to help stabilize the valvetrain with the heavier rockers. If you go the 918 route I would recommend getting some shims to set the install height .050" from coil bind to maximize spring pressure. BTW - The higher spring pressure does not decrease HP because there is always a spring closing and opening at the same time and the pressure of the closing spring will assist in the opening the other. That is a common valvespring myth.

LilJayV10

iTrader: (39)

Well crap I think I am going to change then.

LilJayV10

iTrader: (39)

John,

Could you look at these two manley springs and tell me which one would be better.

the .600 lift spring is 150/355
the .650 lift spring is 150/375

http://www.manleyperformance.com/nic...vetrain.shtml#

Thanks for the help.

Squirts11

iTrader: (14)

I believe the Comp 918 issue was resolved years ago. I know I haven't read anything recently regarding a quality issue.

SOMbitch

iTrader: (8)

I tend to agree with this or at least 1518's. If that cam made power past 6500 I would say duals for sure.....

72Obsessed

iTrader: (3)

The 918's have a .625" max lift. I have the tech sheet from when I bought them. They were redesigned in 07'

SOMbitch

iTrader: (8)

I realize that but those HS rockers are heavier and require more spring to control. Not sure about agressive the ramp rates of your cam are but that has an effect on valve control too. But as long as TR knows you are running HS RR's and say it is ok I would be good with it though. Those guys do this everyday...

LilJayV10

iTrader: (39)

That's a good point, I don't know if they do or not. I was hoping John would post again but I know he is busy

froman

iTrader: (5)

the 918's with the silver nitride finish are the new updated ones.

pitbull14218

iTrader: (3)

im about to buy a TR230, i figured 918's would work well, the TR230 doesnt have that high of a lift, shouldnt it be fine without shims?

ThunderStruk

iTrader: (1)

Being that the Harland Sharp rockers are a bit heavier than stock, a dual valve spring will probably be a better choice than the beehive springs will be.

pitbull14218

iTrader: (3)

but with stock rockers it would be fine with the beehive springs and no need to shim them either right?

5.3LJimmy

iTrader: (10)

Yes with 918's would be okay without shimming and stock rockers. But it is always good practice to measure installed height and shim the springs to the same height(if needed).

Damian

iTrader: (89)

I installed more sets of 918's the past 2 years than I can remember, and I've yet to have one failure. Comp did have a bad batch 4-5 YEARS ago, but most spring breakages I see are user/installer error.

That being said, if you can get away with a beehive do it. Less weight on the valvetrain is a good thing. The TR230 will run on a single spring properly set up for at least 25,000-30,000 miles without the need to replace springs.

LilJayV10

iTrader: (39)

That's what I was wanting to do. I didn't realize the H/S rocker added that much weight

thunderstruck507

iTrader: (18)

using pac springs on my tr230 wanna be cam