BB-Chevy Merlin III Race Block Bore: 4.250"

Name: BB-Chevy Merlin III Race Block Bore: 4.250"
Brand: WORLD PRODUCTS
SKU: 955-081100-4250
Price: 2867.99 USD
Availability: OutOfStock

Currently Unavailable

This product is no longer available. Please call customer service for assistance at 1-800-345-4545.

Merlin III Cast Iron Race Blocks

Bore: 4.250"
Deck Height: 9.800"
Main Caps: Nodular iron

Perfect Foundation for Any Big Block Chevy Build!

Ideal for street, ET bracket racing, and marine applications, World Products applied almost 15 years of Merlin knowledge to develop these blocks, offered bare or race-prepped. The race version features a thoroughly-washed block, plate-honed cylinders to the bore size, and installed cam bearings and freeze plugs. Merlin III blocks have reinforced bulkheads and main webs, thicker decks, 100% compatibility with Mark IV components, and indexed lifter bores for optimum reliabilty.

Their quality is superior to OE parts, especially because each block is CNC-machined to QS-9000 specs using only two fixturing operations (thus avoiding tolerance stacking common to factory blocks from assembly lines). Cylinder bore sizes are standard, with bores semi-finished to allow final honing to suit your specific piston and ring package. Race prepped blocks are finished honed to an exact 4.500'' bore. Made In The USA!

Merlin III Mark IV-style big block is a two-piece rear main seal and compatible with all original GM Mark IV pieces and components including fuel pump, starter, oil filter, and cylinder heads.
Merlin III Gen VI-style big block features a one-piece rear main seal and a Gen VI-style oil pan rail and front cover bolt pattern. The block can utilize either the OE type roller lifters or +.300'' tall tie bar lifters. It also features a Mark IV style fuel pump boss and oil filter pad. The water jacket and surface will accommodate either Mark IV or Gen V-VI style cylinder heads, making this block extremely versatile.

Features

Material: Cast Iron
Bore: Semi-finished to allow final honing to piston/ring package; Race-prepped block is finish honed
Deck Height: 9.800'' (std) or 10.200'' (tall)
Deck Thickness: .600'' Minimum
Cam Bearings: Standard Chevy
Main Bearings: Standard Chevy
Camshaft Location: Stock
Lifter Bores: Indexed
Maximum Recommended Bore: 4.625''
Cylinder Wall Thickness: .250'' @ 4.600'' 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 (can be clearanced for Strokers)
Oil System Features:Stepped oilingDry sump systems can feed from front or rearOil drainback in valley lubricates distributor gearDrilled for dry sump valley scavenge linesExtra head bolt bosses in valley to accommodate special racing headsBlind holes drilled into valley for screen
Crank Clearance: 4.375'' for 9.800'' deck or 4.750'' for 10.200'' deck
Main Caps: 4-bolt nodular iron or splayed billet steel
Rear Main: Mark IV 2-piece seal; Gen VI 1-piece seal
Fuel Pump Mount: OE mount
Starter: OE mount
Motor Mounts: Front and side
Cylinder Head Holes: Blind tapped to prevent leaks
Weight: Approximately 270 lbs
Made In The USA