Engine - Boss 302 - Bare Block - 4.000 in Bore - 8.200 Deck - 4-Bolt Main - 1-Piece Seal - Iron - Small Block Ford - Each

Ford Racing BOSS 302 Cylinder Block

Ford Performance 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 – 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.

Additional Information

Engine Block; Boss 302;

Product Overview

Ford Performance 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 – 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.

• 2-Bolt Main On First And Fifth Main Caps
• 3
• 4 Main Caps
• 8.2 in. Deck Height
• 8.2 in. Deck Height; Finished At 8.200 in. Plus .010 in. To .015 in.
• Designed w/Optimized Cylinder Wall Length For Stroker Applications Up To 3.5 in. w/No Grinding Or Clearancing.
• Finished At 8.200 in. Plus .010 in. To .015 in.
• Finished Lifter Bores
• Increased Bulkhead Material
• Machined To Accept Factory Roller Lifter Guides And Lifter Guide Retainer
• Main Bearing Bores Finished To Low Limit
• NASCAR Inspired Front Oil Feed On Both Lifter Galleys.
• Revised Cooling System Passageways
• Siamese Bore w/Drilled Coolant Crossover Holes
• Splayed 4-Bolt Main On 2
• Splayed 4-Bolt Main On 2; 3; 4 Main Caps
• Threaded Core And Galley Plugs (Straight Thread Port Plugs w/O-Ring)
• Threaded Core And Galley Plugs [Straight Thread Port Plugs w/O-Ring]

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Product Details

Product Downloads

#	Document Type	Download
1.	Installation Instructions

Installation guides, warranty details, and other supporting documents are provided by the supplier. In some cases, these files may originate from regions outside your locale, meaning instructions, warranty procedures, and images may not fully align with your specific vehicle or region (e.g., LHD vs. RHD differences, return policies, etc.). If you need clarification, please contact a StreetFX support agent.

Reference Information

Engine Block, Cast Iron, 4-Bolt Mains, 4.000 in. Diameter Bore, 1-Piece Rear Main Seal, Ford, Small Block, Each

The perfect foundation for your Boss engine--Ford Performance Parts Boss 302 engine blocks! They're built stronger than the originals to make your high performance build a success. Designed as replacements for the legendary Boss 302 and Boss 351 blocks, they use the latest technology and manufacturing techniques. Cast from diesel-grade iron with siamesed bores, thick cylinder walls and decks, Boss block strength is far superior to any Ford production block. Boss 302 blocks are available in standard and Big Bore versions that support engine sizes up to 363 c.i.d. Proven around the world, both on the track and on the street; all Ford Performance Boss 302 blocks are cast and machined to the highest industry standards in the USA.

Features include:
• Big Bore version features 4.125 in. bore capacity, finished at 4.115 in. rough bore
• Standard bore version is finished at 3.990 to 3.995 in. rough bore with 4.125 in. bore capacity
• 8.2 in. deck height, finished at 8.200 in. plus .010 to .015 in.
• Optimized cylinder wall length for stroker applications up to 3.5 in. with no grinding or clearancing (depends on crank/rod manufacturer)
• Splayed 4-bolt mains on 2, 3, 4, main caps
• 2-bolt main on first and fifth main caps
• Main bearing bores finished to low limit
• Finished lifter bores
• Machined to accept factory roller lifter guides and lifter guide retainer
• Fits factory 1979-95 Mustang oil pan with custom oil pickup tube, part number: M-6622-BOSS302
• NASCAR inspired front oil feed on both lifter galleys
• Revised cooling system passageways
• Increased bulkhead material
• Threaded core and galley plugs (straight thread port plugs with O-ring)
• Require special length 1/2 in. head bolts M-6065-BOSS or head studs M-6014-BOSS recommended with M-6049-X306/307/Z304DA heads
• Designed for M-6049-X306//X307/C3/D3/Z304DA cylinder heads
• Not designed for production 302/351W or M-6049-Y302/Y303/X302/X303/X304/X305 cylinder heads
• Uses common O.D. cam bearings M-6261-J351/R351
• Unique cam plug M-6026-S351 included
• M-6051-S331 or M-6051-CP331 head gasket recommended
• Uses stock-type timing cover (M-6059-D351 recommended; includes fuel pump provision)
• Retains clutch cross shaft pivot hole
• Original-style oil filter location
• Original motor mount boss locations
• Original bell housing pattern
• Approximate weights: Big Bore 163 lbs.; standard bore 175 lbs.