the dates on the 840's are A/16/9 & C/26/9
The heads have new Manley valves, Isky springs that will handle up to 0.620" lift, milled 0.010" to make sure they are flat and a professional 3 angle valve job.
rock
http://pg.photos.yahoo.com/ph/cpjlw8...pg&.src=ph [image]