From JEGS:
-5cc flattop SRP forged pistons.
Pontiac 461ci Rotating Assembly
Compression Ratios:
11.5:1 with 75.2cc
10.4:1 with 85cc
8.5:1 with 111cc
http://www.jegs.com/i/Eagle/356/51400/10002/-1
Now of course SUMMIT says differently:
Piston Material Forged aluminum
Piston Style Flat top, with two valve reliefs
Piston Head Volume (cc) +5.00cc
http://www.summitracing.com/parts/ESP-51400030/
From Eagle website:
NOTE! - compression ratio calculated assuming uncut block and .040" head gasket, 87CC head
part number engine CID crank rods pistons bore sizes comp. ratio price
51400 461-468 cast 4.2500" 6.800" H-Beam -6.0cc forged Mahle .035 .065 9.94 1718.75
51500 461-468 4340 4.2500" 6.800" H-Beam -6.0cc forged Mahle .035 .065 9.94 2093.75
51501 488-495 4340 4.5000" 6.800" H-Beam -6.0cc forged Mahle .035 .065 10.47 2093.75
http://www.eaglerod.com/index.php?op...d=33&Itemid=40