66 421 +.040 over 4 bolt main block with ARP Studs. Block code 9782611 YH
Ross Dished Pistons for 9.5:1 on 72cc heads.
Scat Pontiac H Beam Rods
All new Rod and Main Bearings
New Total Seal Rings
New Butler Prepped Oil Pump
Butler Race Ported #13 Heads machined to 68cc that flow 260cfm with paperwork. BP 1114 stamped on heads
Torker 2 intake machined and port matched to heads
New Comp Hyd Roller Cam 288HR
New Howards Roller Lifters
New Milodon Low Profile 7 qt Oil Pan
New Double Roller Timing Chain from Butlers
New Romac Steel Harmonic Balancer
GM 1 Wire Alternator with Butlers Universal Mount Kit
Pro Systems 930cfm Carb
MSD Pro Billet Distributor

Hey b.hill. I see you have a post with a 66 421 for sale, but it won't open for me. Can you give me some info on it please? Thanks, John