[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!

[Rampant]

I am running upgraded LS7s on mine and it has .671 lift on hyd lifters, with a some what agressive ramp rate. (IMG:http://www.frrax.com/rrforum/style_emoticons/default/burnout.gif) They are by far the lightest option. the rollers add a fair bit of weight right on the tip of the valve. We pulled to 6800 on the dyno and will likely go to 7000 on the track.