Race-ready single 4-Bbl (originally stock 360 hp) NOW 630 hp built and dyno'd by Mike Hering, Valley Crankshaft, Boise, ID. Heads: Casting #3852583 ported by Dave Layer. Intake Custom by Valley Crankshaft, Rods: Crower, Crankshaft: stock 409. Custom exhaust pipes included. All custom work completed and ready to install in 1 afternoon in the 1961 Impala in the Drag Cars listings in this website.