anyone have any experience on this...?

there's some info here about mixing heads and blocks. NASIOC has a good bit too.

anyone have any experience on this...?

 

hammer, why don't you tell us about your car and what it's doing wrong or what you'd like to change. very likely some else has already dealt with it and can fill you in. i think you'll get better info faster thet way rather than asking individual specific questions.

 

i've read you can put 2.2 heads on a 2.5 block, but just because you can doesn't mean you should. why would you want to?