DescriptionBig-Block performance built from our LSX Small-BlockOne of the most legendary engines in muscle-car history was the Chevy 454 Big-Block. With the LSX Bowtie block, Chevrolet Performance engineers were able to build a 21st century 454 with the latest technology — and it requires no more space under the hood than a production LS engine.The LSX454 is filled with an all-forged, super-tough rotating assembly and features a pair of our new, deep-breathing LSX six-bolt cylinder heads. It also comes dressed with great-looking, orange powder-coated valve covers with engraved LSX454 logos. We deliver the LSX454 without an intake manifold and other accessories. Use the LSX-LS7 single-plane carbureted intake manifold (P/N 19244033). The LSX454 valve covers do not include provisions for mounting ignition coil brackets. Aftermarket or custom relocation brackets must be obtained. It also includes an eight-bolt crankshaft flange that may require an adapter for use with some transmissions.Tech Specs627 HP @6300 RPM586 LB-FT TorqueEngine Type: LSX-Series Gen-IV Small-Block V-8Displacement (cu. in.): 454 (7.4L)Bore x Stroke (in.): 4.185 x 4.125 (106.3 x 104.8 mm)Block (P/N 19244057): LSX cast-iron with six-bolt, cross-bolted main capsCrankshaft (P/N 19244018): 4340 forged steel with eight-bolt flangeConnecting Rods (P/N 19166964): 4340 forged steelPistons (P/N 19166958): Forged aluminumCamshaft Type (P/N 19166972): Hydraulic rollerValve Lift (in.): 0.648 intake / 0.648 exhaustCamshaft Duration (@0.050 in.): 236° intake / 246° exhaustCylinder Heads (P/N 19201806): Aluminum LSX-LS7 port; with “as cast” 70-cc chambersValve Size (in.): 2.200 titanium intake / 1.610 hollow, sodium-filled exhaustCompression Ratio: 11.0:1Rocker Arms (P/N 12579615 int): Investment-cast, roll trunnionRocker Arms (P/N 12579617 exh): Investment-cast, roll trunnionRocker Arm Ratio: 1.8:1Recommended Fuel: 92 octaneMaximum Recommended rpm: 6500Reluctor Wheel: 58XBalanced: Internal
