rocker ratio?

[northerngn]

i am going to be running this cam
215/220 .516/.529 112 L/S
this is a roller
how do i know what rocker ratio to use?
1.55?
1.60?
1.65?
-dan

 

[Spooled231]

What heads are you running?

John Martin
1986 Buick T-type
9.71 @ 140
6.21 @ 112

 

[northerngn]

stock for now to keep total price down
then prob have them worked later on or next winter
-dan

 

[gossamer]

Stock 1.55 : 1 will keep the lift as advertised by the cam manufacturer assuming they based it on the stock ratio. 1.6 : 1 will give about another .015 lift at the valve and the 1.65 : 1 will give another approx .030 valve lift over the cam manufactures spec.