I am currently doing my MS4 cam install and plan on milling my 241 heads on my 02 SS M6. I would like about 11.5:1 CR. Can i have enough milled off to reach this without intake alignment issues? also how much do i need milled? Car runs on only 93 octane...also will be using .040 cometic gaskets. thanks for any help!

 

Your gonna have to flycut the pistons for sure

 

Ya you will have to flycut most definitely, as for the milling i've heard of some milling like .030. If you really want to get your compression up there go with a milled set of 5.3 heads .

 

Yeah i know i'll have to flycut, i planned on it anyway just to be safe. I don't have any money for heads right now, so i just want to get as much hp as possible while doing the cam swap. Has anybody milled more than .030"??