1968 Big Block Chevy BBC 396 427 Rectangle Port Heads 3919840 840 J-25-7 K-2-7 | eBay
DM 500 Symmetrical Port Big Block Chevy Heads (Price per pair BARE) – CID Heads - Competition Induction Designs
CID DM 500 As Cast Big Block Chevy Heads. (Price per pair BARE) – CID Heads - Competition Induction Designs
Shocker 325 OVAL PORT BBC CNC (Sold in Pairs) - PROMAXX Performance Products
357cc BBC Rectangle Port Cylinder Head - Air Flow Research
Tech: CFE Racing's Hemi Alternative Billet Spreadport BBC Head - EngineLabs
Bbc oval port head porting - YouTube
CFE 14 Degree CNC Ported Spread Port BBC Heads | 586.773.6310
Big Block Chevy Heads "241" for Stage III.5 Porting - YouTube
SR20 (BRX) BBC Porting Service - Bare (SET) - Frankenstein Engine Dynamics
Erson-PBM-World-B2C | 030630CNC - World Products - Merlin 26 Degree BBC Iron Head - CNC Ported 365cc Intake Port, 128cc Chamber, 2.350/1.880 Intake/Exhaust Valves, Rectangle Port, Bare Head
Brodix 351/365 Oval Port Big Block Chevy Cylinder Heads