[freebird72]

Hello new to the engine building and am considering swaping my 6X(101cc)Intake valves 2.11/ exhuast valves 1.66 heads for some #15 Heads (72cc) 2.11/1.77 I'm not quit sure where this will put me as far as compression ratio but i imagine in the 10:1 range or better? I have a 72 firebird with Pontiac 350, Hooker headers, Flomaster, ProComp HEI distributor, still have stock intake and carb (2barrel rochester) but will change to stock 4 barrel intake and qjet carb soon after. Also wanting to know if the HP gain is going to be worth the $ and time? 29cc difference. not sure what other info to put? Any help would be appriciated. Thanks-Bryan