Quote:

A couple of points to consider.

I have heard that the W9 heads are thin on top and agressive profiles & high RPMS will crack the rocker supports.

There is a 80lb gain with the R5 block.

Hope this helps



I dont know what your refering to thin but the valve
cover area is thinner(so called light weight), on
the rocker area, if you use the good rockers, like
TD or Jesel you wont have a problem(at least I havent)
but I have only been turning mine to 8200 rpm but
have been as high as 8600rpm and I dont have any
problems on the rocker mounts. I heard from the race
group at work that they did have pedistal problems
cracking when they first brought out the W-9 but
havent heard of it since then