Marine Crate Engines

The Merlin IV Block is a perfect choice for high performance marine applications.  It incorporates important features of the Pro Race block such as reinforced bulkheads and main webs, thicker decks, and a priority main oiling system plus essentials for marine use such as utilizing the stock Chevy oil pan pattern, OEM 2.750" mains and 100% compatibility with Mark IV Bow Tie components.  The nodular iron 4-bolt mains provide the necessary support for high RPM operation while maintaining excellent bearing wear. Indexed lifter bores assure optimum reliability.  World Products blocks are manufactured to QS-9000 specifications.

TECHNICAL SPECS

• Material: High Density Cast Iron

• Deck Height: Standard 9.800"

• Deck Thickness: .600" minimum

• Cam Bearings: Standard Chevrolet

• Main Bearings: Standard Chevrolet

• Camshaft Location: Stock

• Lifter Bores: Indexed (stock .8437" bore)

• Bore: 4.240 (hone to 4.250") or 4.495 (hone to 4.500")

• Maximum Bore: 4.625"

• Cylinder Wall Thickness: .250" at 4.620" bore

• Water Jackets: Expanded for better cooling

• Lubrication: Priority main oiling system

• Filtration: Integral mount for spin-on filter

• Oil Pan Rails: Solid (stock width)

• Crank Clearance: 4.375" stroke

• Main Caps: 4-bolts splayed, nodular iron or billet steel

• Fuel Pump: OEM mount

• Starter: OEM mount

• Motor Mounts: Dual (front and side)

• Cylinder Head Holes: Blind tapped to prevent leaks

• Weight: Approximately 270 lbs.

Compatible with all Mark IV components

All Merlin IV Blocks need finish machine work to complete.

Remember: TCM offers complete machine service and block preparation