Proform Rollers

If your gonna buy roller rockers you need to ask questions and find out what's junk and what's not.
I asked all those questions and found the weak link was the ADJUSTERS, and that you NEED GOOD SHAFTS and You MUST have proper side clearance.

And really those proforms aren't for lifts more than .480 and spring pres more than 300 is what I was told by mancini when I was first looking to buy some.

Don't just buy something and bolt it to your engine without knowing first hand from a reputable builder, I asked Dan dvorak, ohiocrank, rckr speclty's