Heater,
I have used these.
http://cgi.ebay.com/ebaymotors/ws/eBayIS...RK%3AMEWAX%3AIT

Recently on the dyno 250. They are 1.7 ratio and require a 7/16 rocker stud. Valve cover clearance will be a issue as with most aftermarket rockers. They will fit under a mercruiser cover with the front and rear clearanced out abit.


Tom

Inliner Member 1716
65 Chevelle Wagon and 41 Hudson Pickup
Information and parts www.12bolt.com