Merlin Cast Iron Big Block Chevy Gen VI Bare Block

Name: Merlin Cast Iron Big Block Chevy Gen VI Bare Block
Brand: WORLD PRODUCTS
SKU: 955-091103
Price: 3842.02 USD
Availability: InStock

^$3,842⁰²

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Ships on 09/10/2026

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4.245 in. Bore

Merlin Cast Iron Engine Bare Block

Big Block Chevy Gen VI

1-Piece Rear Main Seal

4.245 in. Bore

9.800 in. Deck Height

Standard Cam Journal

Nodular Iron Splayed Main Caps

Features

Material: High-Density Cast Iron
Deck Height: 9.800 in.
Deck Thickness: .600 in. minimum
Cam Bearings: 2.120 in. journal bore
Main Bearings: Standard
Camshaft Location: Stock
Lifter Bores: Indexed (stock .8437 in. bore) requires +.300 tall lifters
Bore: 4.245 in.
Maximum Bore: 4.625 in.
Cylinder Wall Thickness: .250 in. at 4.600 in. bore
Water Jackets: Expanded to provide better cooling
Lubrication: Priority main oiling system
Filtration: Integral mount for spin-on filter
Crank Clearance: 9.800 in. 4.375 in. stroke
Main Caps: Nodular iron 4-bolts splayed, stepped registers w/ ring dowels
Mark IV style fuel pump mount
Gen VI rear main seal, oil pan bolt pattern, timing cover bolt pattern
Starter: OEM mount
Motor Mounts: Dual (front and side)
Cylinder Head Holes: Blind tapped to prevent leaks
Weight: 270 lbs.
Accepts Mark IV, Gen V, or Gen VI cylinder heads

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART

Enhanced Vortec Gen VI Bare Block

World Products is offering a Gen VI big-block compatible design that has been engineered for maximum durability and strength. This block uses a Gen VI one-piece rear main seal, oil pan rail, and front cover bolt pattern. Gen VI Big Blocks can utilize either the OE style hydraulic roller lifters or +.300 in. tall tie bar lifters. A unique feature on these bare blocks is the Mark IV style fuel pump boss to adopt a mechanical fuel pump with ease. The orientation of the water jacket and deck surface design will accommodate either Mark IV, Gen V, or Gen VI style cylinder heads, providing for maximum strength and versatility.

Part TypeEngine Block

Product LineWorld Products Big Block Chevy Gen VI Merlin Cast Iron Block

BrandWORLD PRODUCTS

Package Width270.0

Weight270.0 PG

Part CategoryPerformance Parts

Part FitmentSemi Universal

Vendor Part Number091103

Package Qty1

Package TypeEA

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