I have an extra set of roller rocker arms that I could use in my coupe for a little while. They will, eventually, go in the motor for the Field Car. In the meantime, I'm thinking about putting them on the 327 to try them out. What considerations should I make to figure if this is a move in the right direction? Outside of valve clearance, pushrod geometry, spring bind etc., what are the performance advantages and disadvantages. Right now, I have a Comp Cams XE274H. It's a .490/.490 lift with 230*/236* duration at .050. With the 1.6 rockers I would be at .522/.522 lift. (.490/1.5=.326 lobe lift and .326* 1.6= .522 valve lift) I think the duration will increase about 20* to 250*/256*. I ran the Comp Cams CamQuest program and loaded in "Pro Street and Mild Racing" and it recommended a 294H grind that is a 519/523 lift and a 250*/256* duration. Almost identical to the numbers I'm coming up with by exchanging rocker ratios. The rpm range lists it as making power to 1000 rpm higher, right to where I'm shifting now. So, will putting these rocker arms on the motor have the some characteristics as changing to the 294 cam? It's temporary, so I'm not as concerned about the street manners. If it's a big issue, I'll just switch back sooner. I'm more concerned with the all out performance difference they may make.