Originally Posted by redfish211
I thought I was finished with my first performance project build, now having trouble with adjusting my roller rockers. I actually had two break, which was number 3 and 4...with one push rod breaking also. The truck ran fine, but started tapping like hell under the valve covers. I pulled them off.. and found the two broken roller rockers, and others loose. I'm just checking to see if adjusting the rollers are different than stock. I actually have a set of stock self aligning rockers for my vortec heads, and curious if going with the stock would be better??? Frustrated, and ready to roll.
If you haven't, I'd suggest you check the push-rod length. When making changes to heads and rockers, even valves often the dimensions change enough to require a different length push rod so as to position the rocker where the roller sweep on the valve stem is over the optimum area and stays on the stem. Check out this link to comp for the proper alignment if you haven't already done this. http://www.compcams.com/Pages/417/va...-geometry.aspx
The other risk with a "performance build" is that the piston and valves may not have sufficient clearance. This gets to be a problem when milling heads, decking the block, using flat top or domed pistons, running more camshaft duration, or using more lift at the valve due to the cam and or rocker ratio. These things singly or in combination can result in impacts between the pistons and valves.
Otherwise the adjustment should be the same at the valve stem for hydraulic or solid lifters which ever you're using.
Some rockers don't fit inside all valve covers, although usually when there's a conflict here its the valve cover that looses unless its a cast and even then.
You also need to be sure that you don't use both a self aligning rocker and a push-rod guide. Alignment of the push-rod guide needs to be checked when using these aftermarket parts with screw in studs. The process of making the guide and the process of installing the studs often leads to dimension issues that bind the push rods.
Well that's kind of shotgun approach, but the best I can do without more info or being there.