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World Products 091107

Merlin IV Big Block Chevy Engine Block 4.595 Bore 9.850 Deck Cast Iron

World Products 091107


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World Products 091107 Merlin IV Big Block Chevy Engine Block 4.595 Bore 9.850 Deck Cast Iron $2,320.16
Merlin IV Cast Iron Engine Block
  • Big Block Chevy
  • 2-Piece Rear Main Seal
  • 4.595" Bore
  • 9.850" Deck Height
  • Standard BBC Camshaft Bearing Journal
  • Standard BBC Lifter Bore
  • Nodular Iron Main Caps

  • World Products has redesigned the famed Merlin Big Block Chevy casting, incorporating numerous improvements and new features. Designated the Merlin IV, this new block is sure be a favorite among racers and professional engine builders. New features include thicker main webs for increased strength and thicker cylinder walls which are nominally .290” @ 4.600” bore. The Merlin IV also has an increased volume priority main oiling system with a front oil feed for dry sump systems and front oil cross over and restrictor provisions. Cam journals up to 2.480” or 60mm Babbitt are available as are .904” lifter bores. Also new are deck heights from 9.500” to 9.850” and 10.200” to 10.250”. The new block features siamese cylinder bores in 4.245”, 4.495” or 4.595” which finish at 4.250”, 4.500” and 4.600” respectively. 


    • High Density Cast Iron Construction 
    • Priority Main Oiling
    • Front Oil Inlet and Restrictor Provision
    • Bores to 4.625" max
    • Cylinder Walls 0.290" @ 4.600" Bore
    • Valley Accomodates OE Roller Lifters or Use +.300" Tall Aftermarket Lifters
    • Clearance for 4.375" Stroke - 9.800" Deck; 4.750" Stroke - 10.200" Deck
    • Splayed 4-Bolt Main Caps with Dowels & Stepped Register, ARP Fasteners
    • 2-Piece Rear Main Seal
    • Accepts Standard Big Block Chevy Components
    • Up to 60mm Babbit Cam Bearing Journals & .904" Lifters
    • OE-style Fuel Pump & Starter Mounts
    • Approximately 270 lbs
    • Rated to 1000+ Horespower
    • Made In USA

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