I found on ebay a set of aluminium roller rocker arms,stud mount. 1.65 ratio X 7/16" stud. My questions are did it gona fit on a stock pair of aussie heads or machining is required to instal. What is the difference 1.65 and 1.73 ratio. Also the seller said is not self-alingning , did this mean guide plate ?

 

stock 335 heads have pedestal-mount 1.73 ratio rockers. to fit stud-mount rockers, machining is required. 1.65 ratio won't open the valves enuf.

I went with scorpion pedestal mount roller rockers (from Tim Meyer). they bolt right on stock heads, are available in the correct ratio and even fit under stock valve covers.

 

Thank you Packlet. I'm gona take a look.

 

do you have the aussie heads already? what are they going to go on?...just curious

 

yes. On a 400(408 .030 over).