thanks everyone on the advice...first i have a 1.5 rocker ratio as i had rocker specialities blueprint and true my rockers up, yes in need vacuum for power brakes and ac and dont want to use a pump,so i believe i will move my lobe seperation to 112, and my compression ratio should be in 9.2 to 9.4 range with the steel shim head gasket....next question becomes to go with a 224/230 or a 230/236 at 50 cam. remember my heads have been CNC ported,2.14/1.81 valves,etc.....thx everyone keith
neither. going from 110 to 112 isn't going to buy you that much. i've found that increasing overlap by 5-6 degrees at .050" will reduce vacuum by 1". i'm pretty sure that rocker specialties doesn't correct ratio. to do that means moving the adjuster location. find a way to check your rocker ratio before assuming it's correct. the scrub pattern on those iron rockers is fairly long when compared to a roller, and the more lift you have means more scrub travel. be sure to check geometry.
