From all measurable standards, World Products’ trendsetting MAN O’WAR cast iron block is the ultimate replacement for factory Windsor 351 blocks. It comes in various deck heights to match the application. The 8.2” block is a direct bolt in for 5.0L Mustangs and compatible with OEM heads and exhaust systems. 9.2” and 9.5” deck blocks are also offered. 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.

Material: High density cast iron
Deck Heights: 9.500"
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" (470 c.i.d. with maximum stroke crank)
Water Jackets: Expanded for better cooling
Lubrication: Priority main oiling system
Filtration: Integral mount for spin-on filter
Oil Pan Rails: Stock Ford Crank Clearance: Can use up to 4.250" crank
Main Caps: Splayed billet steel, nodular iron, 4 bolt
Oil System: Has .500" feed; bosses for dry sump
Weight: Approximately 200 lbs.