Going in this weekend, 1.6 full roller rockers. According to GM, full roller rockers are worth 1.3 horse power per. rocker and 2.3 pounds feet of torque per. rocker and 5 to 10 hp. for the 1.6 rocker ratio.
Be sure to clean them out of any aluminum shaving in the needle bearings.

 

You should upgrade the valve springs. The factory ones are not going to like the extra lift. If you have higher miles it will be worse. GM makes a set of RR for the LT1


Make sure you have a good understanding on how to get the lash adjusted. I lost count of home many times I have had friends call me in to "get the adjustment right". Most cases I just loosed everything back up and just follow the procedure. It is not hard but it seem some people have trouble following instructions. That or I just have dumb/drunk friends.

 

better measure for push rods too. https://camaroforums.com/forum/93-02...-length-51829/

 

Do we know the same people??

 

Keep in mind that aluminum rockers, although a good choice for racing applications, they are not the best choice for street use. Continuous pounding for thousands of miles of street use causes even the best aluminum ones to fatigue and fail. A better choice for street use would have been cast steel rockers, such as the ones sold by Comp Cams. They cost more than most aluminum ones, except for the shaft mounted ones, and can survive the beating of daily use.

 

^^^ thats what i have and am over 30k miles so far.

 

GM put them in the LT4 from the factory?

 

They did, and used Crane Cams Gold series aluminum rockers made to GM specs, probably the best available at the time. Not many LT4 engines were made, and most cars sold with them became collector pieces instead of daily drivers. GM Performance also sold them as part of the "Hot Cam" kit, which included camshaft, aluminum rockers, and springs. The hot cam itself was sold in two varieties, one for use with the 1.6 aluminum rockers, and the other, with higher lift, for use with the standard 1.5 GM steel rockers. Actual valve lift was about the same with either combination, but the aluminum rockers returned more power because of less friction due to roller bearings in the trunnion and tip.

 

that's what I have in my 406 cast steel rockers comp they are just plain looking but good ,it amazes me that they make all these nice colors to something you will never see,that,ya just did adjustment on mine an some were way to tight ,there right now an it was simple to watch him do it,its neat to see all they need is about the with of a peace of paper are the shims so they are all the same

 

The ones above are from the Hot Cam kit. I am not sure who makes them but the have bowties stamped into them and no other name. I have the Cam sitting on a shelf also, 7 or the 8 lobes are mint the 8th one needs a little work. Anyone what to buy it I was thinking of making a lamp out of it. (Musicman reference)