Comp Cams Small Block Roller Rockers...

Does anybody know if the Comp Cams roller rockers for a small block will fit under a stock valve cover? I have a set of Commando 273 valve covers I'd like to use.


I'm also wondering if anybody has an opinion on these rocker shaft hold downs. Overkill with a spring that's rated at 320 lbs. open? I'm planning to use a hydraulic roller cam with a set of Eddy heads.

http://chucker54.stores.yahoo.net/rocshafhol.html

Thanks guys!