From all measurable standards, World Products’ trendsetting MAN O’WAR cast iron block is the ultimate replacement for factory 351 blocks. You should know that the MAN O’WAR block was used to win the Engine Masters Challenge, and that its design allows huge displacements. Add provisions for 2 extra bolts per cylinder and you can see why it’s a favorite of serious Blue Oval racers!

The MAN O’WAR block was designed from scratch (in collaboration with a leading NASCAR team) using CAD/CAM and 3D design technology. With the ability to design not only the part but the tooling to manufacture it, World’s engineering team has come up with an elegant design that can be cast and machined to exacting specs. Like all other World blocks, the MAN O’WAR is machined using only two fixturing operations, avoiding the tolerance stacking found in OEM production lines.

GET IT PREPPED!
For the enthusiast who is planning to assemble an engine in their home garage, getting the block in a RACE-PREPPED state is a no-brainer. Our experienced staff performs important basic operations like:
• Deck milling +/- .0025”
• Main journal honing +/- .0004”
• Cylinder bore plate honing .001” oversized +/- .0005”
• Lifter bore honing +/- .0005”
• Block hot tanking
• Cam bearing installation
• Freeze plug installation
• Dowel pin and pipe plug installation
• Block deburring
• Machined surfaces sprayed with rust inhibitor
• Protective wrapping
More and more professional engine builders are also recognizing the benefits of ordering race-prepped blocks instead of endeavoring to perform these many tasks themselves. Many have realized that their time can be better spent doing critical assembly work such as degreeing in camshafts and setting up the valve train. By employing race-prepped World blocks the shop’s through-put can be accelerated, and there are demonstrated savings in terms of personnel, shop equipment, space and cash flow.

Whether you're an enthusiast or engine builder, save time and money!

Material: High density cast iron
Deck Heights: 9.200"
Deck Thickness: .600" minimum
Cam Bearings: Stock - can be bored to 60mm
Lifter Bores: Cross-feeds between pairs to maintain pressure
Bore: 3.990" (bore to 4.000") or 4.115" (bore to 4.125")
Cylinder Head Attachment: Stock plus 2 extra head bolts per cyl. (not req.)
Maximum Bore: 4.200"
Water Jackets: Expanded for better cooling
Lubrication: Priority main oiling system
Filtration: Integral mount for spin-on filter
Oil Pan Rails: Stock Ford (“C” block requires use of 351 pan)
Crank Clearance: Can use up to 3.500" crank
Main Caps: Splayed billet steel, nodular iron, 4 bolt
Oil System: Has .500" feed; bosses for dry sump
Weight: Approximately 200 lbs.