With the high spring pressures required
(150lbs+) with a solid roller the stock valve seats become the weak link. I know alot of heads have 2.02/1.57 valves using the stock seats which were designed for 76lbs seat pressure.
At 150lbs plus the stock seats are short lived so hardened race seat are required.

Also with the lightweight valves and valvetrain pieces of the LS1 150lbs is sufficient seat pressure to let the engine rev to 8000rpm. Always use only as much spring pressure as you need for longer valvespring life.

 

Excellent information Joe, as I plan on going solid roller next Spring perhaps.

<img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

Tony

 

I have the Comp Cams 977 springs and that's also is what was on the SAM 375inch motor.
The smaller diameter of the 977's helps on rocker arm clearence. If your going with the T&D shaft rocker setup pay close attention to the instructions especially the part about stand height and checking to get the correct pushrod length. They're many varibles in valvetrain geometry so just because your buddy used one length pushrod don't mean it is the right one for you.