I am building a 416 with 12:1 piston,port and polish,rev box ,and Sparks X-6 exhaust with bigger valves,any of you guys have any ideal what HP it should be putting out?I think I seen somewhere it was around 27 stock?Thanks,Marvin

 

35 to 40 is about all the more you should expect to see. You'll love the power though, way more torque than stock.