There's nothing quite as ''in-your-face'' as a big-inch rat motor. With a much larger displacement than any factory big block Chevrolet offering, World's 509ci and 540ci Merlin powerplants gives you ground-pounding horsepower and torque at a moderate price. World Products famed Merlin block is the foundation for these engines. They have a number of important features not found in OEM blocks that help produce extra power with an exceptional level of reliability. Improvements in cooling, oiling and manufacturing procedures. The Merlin cylinder heads are likewise far superior to factory offerings both in flow characteristics and cooling. Each engine is dyno tested to assure performance at or above published figures.SPECIFICATIONS
Block: World Merlin III cast iron, billet main capsCrankshaft: Eagle 4340 crankshaftBalancer: ProRace InternalConnecting Rods: Eagle H-beam 4340 L-19 boltsPistons: Mahle coated pistonsPiston Rings: Total SealCompression Ratio: 9.5:1509ci Bore/Stroke: 4.500'' x 4.000''540ci Bore/Stroke: 4.500'' x 4.250''Bearings: Clevite H-bearingsCamshaft: Hardcore hydraulic lifter camTiming Chain: Hardcore double rollerCylinder Heads: World Merlin 345 (cast iron or aluminum)Valves: Manley Street Master 2.300'' Int/1.880'' ExhValve Springs: HardcoreRetainers and Valve Locks: ManleyValve Seals: HardcoreRocker Arm Studs:
HardcorePushrods: Hardcore 4340 1-piecePushrod Guide Plates: HardcoreRocker Arms: Scorpion aluminum roller rockersOil Pan: Milodon/CantonOil Pump: MellingAssembly Components: Stainless hardwareIntake Manifold: Merlin single planeCarburetor: Hardcore 870 cfm 4150 typeDistributor: Mallory HEIFuel: Pump gas
Warranty: 2 year/24,000 mile