10-11:1
310cc runners with pocket porting this will be excellate if you stay under 7,000rpm
325cc normally are for over 7,000 or above 500ci guys and the 4.500" bore blocks hence they come with 2.3" intakes vs 2.25" intake vlv that the 310cc heads do
~240* @.050 dual pattern cam
lift .600 range
also got retro hyd roller cams as well
high rise dual plane intake
put you well over 600ftlb