340 Pistons with 10.5 CR with X Heads???

swinger340 said
If they were to cc 68 the 2316s would give you 10.2:1 I have the 2316s, stock lightened rods w ARP bolts, and a stock .010/.010 forged crank in one of my 340s with OOTB closed chambered edelbrock heads and it dynoed 428 HP @ 5800 w a solid flat tappit cam. Not to shabby for a 340 ci May have port work and install a roller cam later on to see if I can get 450 + out of her.

That is what I am aiming for. Hope port and flow the X heads up to around 250 cfm at 500 lift. I think I can do it with mild pocket porting gasket match and the 2.08 intake vale with 5/16 stem diameter. Then top it with a gasket matched air gap intake. Stock steel crank with lighter rods and pistons. Hope to get up to 450 HP with a torque curve as broad as possible. If that means higher comp ratio and maybe rough street manors I am ok with that. Not like I even have the time to drive it every day. I want the car to scream like a bat out of hell but still look as stock as possible.

Thanks for all the info. I think I need to get my heads done first. Then CC them before deciding on milling either head or block. But if I come across a good enough deal on a KB 243 or similar piston I might pull the trigger and make them work.