Boss 351 Engine Block 9.5" Deck


SKU: M-6010-BOSS35195 Ford Performance

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Product Availability: 05/28/2021

Ford Racing Engineers have designed the replacement for the legendary BOSS 302 and 351 blocks using the latest technology and manufacturing techniques from both the production and racing worlds.¬† The BOSS block capability has been proven abound the world ‚Äď both on the track and on the street.¬† By preserving many of the dimensions and features from the original 289-351 blocks, the BOSS blocks are compatible as replacements for use in just about any vehicle that used a Windsor style engine.¬† Cast from diesel grade iron and designed with added material in key areas, BOSS block strength is far superior to any Ford OE block ever produced.¬†

  • 4.125" bore capacity, finished at 3.990" to 3.995" rough bore.¬†Also available in big bore version, part number: M-6010-BOSS351BB
  • 9.5" deck height, finished at 9.500" plus .010" to .015"
  • Maximum recommended stroke 4.250", clearance dependent on crankshaft/connecting rod manufacturer
  • Splayed 4-bolt main on 2, 3, 4, main caps
  • 2-bolt main on 1 and 5 main caps
  • Main bearing bores finished to low limit
  • 2.749" main journal diameter (stock 351C size)
  • Finished lifter bores
  • Machined to accept factory roller lifter guides and lifter guide retainer
  • NASCAR inspired front oil feed on both lifter galleys.
  • Revised cooling system passageways
  • Siamese bore with drilled coolant crossover
  • Increased bulkhead material
  • Threaded core and galley plugs (straight thread port plugs with O-ring)
  • Requires special length 1/2" head bolts M-6065-BOSS or head studs M-6014-BOSS recommended with M-6049-X306/X307/X2/Z304DA/Z2 heads
  • Designed for M-6049-X306/X307/X2/C3/D3/Z304DA/Z2 cylinder heads. Not designed for production 302/351W or M-6049-Y302/Y303/X302/X303/X304/X305 cylinder heads
  • Uses common OD cam bearings M-6261-J351/R351
  • Unique cam plug M-6026-S351 included
  • M-6051-S331 or M-6051-CP331 head gasket recommended
  • Designed to be compatible with the original 302 and 351W blocks and includes the following features:
  • Designed to use stock type timing cover, timing Cover¬†M-6059-D351¬†recommended (includes fuel pump provision)
  • Fits factory mustang oil pan with custom oil pick-up tube¬†M-6622-BOSS302
  • M-6026-A Service Replacement Plug and Dowel Kit available separately √Ę‚ā¨‚Äú includes O-ring threaded plugs, black anodized aluminum plugs with Buna "O" rings for the oil galleys, water drains and core holes, and dowels for front cover, clutch housing and cylinder heads
  • Retains clutch cross shaft pivot hole
  • Original Style oil filter location
  • Original motor mount boss locations
  • Original bell housing pattern
  • Weighs approximately 205 lbs.
  • Great price and value
  • The foundation for 9.5" deck projects

Proven performance - used in Ford Racing high performance crate engines, a proven winner out of the crate and thousands of laps before rebuild.

In the April 2010 issue of Circle Track Magazine, the editors built a Late Model Stock engine using the BOSS 351 block. To check out the article, visit the Circle Track site here.

 Ford Racing BOSS Blocks