I have a newer set with the M2 number. There is also the Letter stamped "E" on the head kinda sideways. It looks like the letter used on Edelbrock products..well kinda. I have a bunch of pics, and with a MCH CNC port program they will break the 460cfm mark...
[color:"red"]65 Hemi Belvedere coming soon [/color] [color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
