[pharmd]

Is the stock rocker with trunion upgrade adequate, or is their a real concern necessitating I run a full roller?

My engine guy says anything over .600 lift and 6000rpm needs full roller (he is a Ford guy). He also is concerned about spring pressures. Additionally he suggests that once preload is set with pushrod length if the valves need to be adjusted in a different spot it would be nearly impossible with the limited travel lifters. He says with aluminum block/heads preload changes a lot when it gets hot.

I have too much money in the setup as is, and really don't want to have to buy yet another set of rockers. The motor will be used for HPDE, autox, and some daily driving.

Anyone know the limits on these stock rockers with the upgrade?

Any help appreciated!

[dailydriver]

I've actually heard some engine builders state that the GM stockers, especially with the upgrade, are better than even the top, shaft mounted or otherwise, Jesels or T&Ds, regardless of cost considerations, or upper rev limits. (IMG:http://www.frrax.com/rrforum/style_emoticons/default/dunno.gif)

[pharmd]

I've actually heard some engine builders state that the GM stockers, especially with the upgrade, are better than even the top, shaft mounted or otherwise, Jesels or T&Ds, regardless of cost considerations, or upper rev limits. (IMG:http://www.frrax.com/rrforum/style_emoticons/default/dunno.gif)

Just ordered the Yella Terra Adjustable shaft mounts. So lets see what happens. My engine builder basically said he wouldn't put out this quality of motor with stock rockers on it. So I will have a set of rockers with brand new trunion upgrade up for sale soon!

[GlennCMC70]

I've actually heard some engine builders state that the GM stockers, especially with the upgrade, are better than even the top, shaft mounted or otherwise, Jesels or T&Ds, regardless of cost considerations, or upper rev limits. (IMG:http://www.frrax.com/rrforum/style_emoticons/default/dunno.gif)

Just ordered the Yella Terra Adjustable shaft mounts. So lets see what happens. My engine builder basically said he wouldn't put out this quality of motor with stock rockers on it. So I will have a set of rockers with brand new trunion upgrade up for sale soon!

Alot of non-LS motor guys underestimate the LSX platform from crank, rods and pistons. I had nitrous on a can and header only LS1 that put down 670tq to the rear wheels on a 100 shot. GM didn't miss much on this motor.

Also - back in the day when I was doing alot w/ LS motors, Yella Terra was complete crap. I hope they have changed.

[pharmd]

I've actually heard some engine builders state that the GM stockers, especially with the upgrade, are better than even the top, shaft mounted or otherwise, Jesels or T&Ds, regardless of cost considerations, or upper rev limits. (IMG:http://www.frrax.com/rrforum/style_emoticons/default/dunno.gif)

Just ordered the Yella Terra Adjustable shaft mounts. So lets see what happens. My engine builder basically said he wouldn't put out this quality of motor with stock rockers on it. So I will have a set of rockers with brand new trunion upgrade up for sale soon!

Alot of non-LS motor guys underestimate the LSX platform from crank, rods and pistons. I had nitrous on a can and header only LS1 that put down 670tq to the rear wheels on a 100 shot. GM didn't miss much on this motor.

Also - back in the day when I was doing alot w/ LS motors, Yella Terra was complete crap. I hope they have changed.

The Harlan Sharps are truly problematic...the YT's have had some issues, but those were the non-adjustable rollers. Lets face it, in alot of these situations the fault may actually not lie on the rocker, the rocker may have failed because the pushrods were the right length, too much spring pressure etc. I am hoping that I have made the correct choice, the engine builder wasn't giving me a whole lot of options. He is sort of a friend, so I really don't want to end a friendship over this, but its been an adventure.

Well, see, I think within the next 3 weeks it will be in the car. Hoping the "buy quality parts, having knowledgable people work on your car, and sweat the details and you'll have success" plays out for me.