273 Closed Chamber Heads

[Green Monster]

Building my 273 with new 30" over Commando pistons and closed chamber heads ported and 1.88 intake 1.60 exhaust valves LD4D edlebrook intake ITT Headers street & strip cam. Should pull pretty good when done.

 

[65Val]

Should be good....just be aware that the "new" Commando pistons aren't actually 10.5:1 comp. Many members have found them to be closer to 9.5-10 with closed heads.