Hey, I'm going to drop my heads off at the machine shop this week and wanted to get some tips first. Heres what I'm working with:
1974 Dart Swinger, 318 with edelbrock performer and 600cfm 4bbl, A904 with trans-go stage II kit, 2,200-2,500 stall converter, 8 1/4 with 3.23's, comp 268 cam/lifters with MP springs. I want to have a nice fun driver that can get up n' go but still be streetable. I'm not in any hurry to crack into the bottom half of the motor (might as well do a 360 if I do that) so instead of tossing some KB pistons in, I'm just going to mill my heads to raist the compression into the area of 8.5 to 9.5. My heads are bone stock 1974 318 heads, with mild porting and gasket matching.
Now the question!!!
How much can I shave off the heads to still keep my rocker geometry (stock non-adjustable) in a happy place? I know Mancini's sells rocker post shims up to 30 thous so that is an option if need be. So, how much can I safely shave off and which head gasket is the best to use? Does anyone know the formula for how much milling reduces your cc's?
Sorry, a little scatter-brained this morning, if anyone has some tips I'd be very greatful! Thanks!