Monster Flow, Part 3—LS CNC Porting

By Jason Reiss Photos Courtesy of Frankenstein Engine Dynamics Tech Specs: GM Stock LS1 Cathedral, Stage 1 (243/799/317/241/853 castings) Reuse Factory Intake Valves: 2.000-inch Reuse Factory Exhaust Valves: 1.550-inch Intake Volume: 224cc Exhaust Volume: 82cc Intake Peak Flow: 302 cfm Exhaust Peak Flow: 240 cfm Stock Chamber Seats: Stock Iron Guides: Stock Powdered Metal Minimum Bore: 3.900-inch Intake Manifold Recommendation: FED LowPro (Sold Separately) Stock Rockers. Trunnion Upgrade