There are lots of differences in roller rockers including overall
dimensions. As an alternative to the hurky big aluminum-bodied rollers
check out Comp Cams Pro Magnum Roller Rockers. They have a much smaller
profile which makes them easier to fit under aluminum valve covers. I've
been using a set for several years. I do recommend going to the 7/16 stud
size as a guard against breaking rocker studs with high pressure valve
springs and high lift camshafts.
http://www.competitioncams.com/information/Products/RockerArms/ProMagnum.asp
Bob Hokanson
Retired as of 1/1/02
Looking forward to spending more time with my toys
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