[DAVID GAGNARD]

Earl;

Rocker arm ratio,be it 1.5/1.6/1.7,multiply the actual cam lift by that amount.....Just depends on how much total llift you are looking for....

As far as alum. vs. steel goes,I've heard all the stories... Alum. is lighter and better,but wear out,now they make steel ones just as light,but do not wear as bad....etc,etc....

When I built my engine in 1996,I bought the Crane Cams alum roller rocker arms in 1.6 ratio,they have been on my 351-W with approx. 350hp since then and have a little over 20,000 miles on them and have seen about a hundred passes on the drag strip shifting at 5500 to 6000 rpms and about 200 miles of open track now,I set them when I put them on the engine and have never touched them since,I also used some good poly-locks. Take that for what it's worth....

BTW,if the price is competitive and the weight about the same I would probably use the steel ones in the future...

David