what roller rockers should i use

[sik-holden]

i dont know what roller rockers to use on my vn.

the current motor is a s1 but im am building a s2 up with fairly high compression so i want sumthing thats going to help get as much hp as possible.

tim

[TappetHead]

YT6657 are 1.8:1 3/8" mounts and should fit straight onto an S1 engine.
The S2 heads can be drilled and tapped to take the larger bolts so the rockers can be used on both engines if you want.
The only thing to be carefull of is the ratio.
As a rule the 1.8's will give best gains with standard camshaft but can be too much for use with some aftermarket camshafts.