Skip to content
Are you in Oklahoma or Arizona? Are you in Oklahoma or Arizona?

Are you in Oklahoma or Arizona?

We hope to service your area soon. In the meantime, please choose the brand you’d like to browse, and we will redirect you.

Not ordering to one of these states? Click here to continue shopping.

Mustang 1964-2004 Boss 302 Engine Block Big Bore
Mustang 1964-2004 Boss 302 Engine Block Big Bore
Mustang 1964-2004 Boss 302 Engine Block Big Bore
Mustang 1964-2004 Boss 302 Engine Block Big Bore
Mustang 1964-2004 Boss 302 Engine Block Big Bore
Mustang 1964-2004 Boss 302 Engine Block Big Bore Mustang 1964-2004 Boss 302 Engine Block Big Bore Mustang 1964-2004 Boss 302 Engine Block Big Bore Mustang 1964-2004 Boss 302 Engine Block Big Bore Mustang 1964-2004 Boss 302 Engine Block Big Bore

Pick up at your selected dealer is free

Make the most of your vehicle – and your lifestyle

Engineered to fit your vehicle

Part No: {{ selectedVariant.sku }}

Mustang 1964-2004 Boss 302 Engine Block Big Bore {{ variantColorValue }}

{{ selectedVariant.price | money }} {{ selectedVariant.compare_at_price | money }}

Pick up at your selected dealer is free

Make the most of your vehicle – and your lifestyle

Engineered to fit your vehicle

About This Product

In the world of racing and performance, BIGGER is always better.  Ford Performance gets it -  and that's why it offers BOSS small blocks in Big Bore versions.  The Ford Performance BOSS blocks are designed to be a replacement for the legendary BOSS 302 and BOSS 351 blocks using the latest technology and manufacturing techniques available.  Cast from diesel grade iron with siamese bores, thick cylinder walls and decks, BOSS block strength is far superior to any Ford production block ever offered. 

 

Ford Performance Big Bore version of the BOSS 302 block makes it simpler and more economical to build really BIG small blocks.  To insure the most precise bore location, concentricity and integrity, the BOSS Big Bore blocks are machined an additional .125" during the initial block fixturing and boring stage.  With an unfinished bore size of 4.120", Ford Performance BOSS 302 Big Bore blocks will support engine sizes up to 363 cubic inches. 

 

The Ford Performance BOSS block capability has been proven around the world, both on the track and on the street.  And, all Ford Performance BOSS blocks are cast and machined to the highest industry standards in the USA. 

  • 4.125" bore capacity, finished at 4.115" rough bore. Also available in standard bore version, part number: M-6010-BOSS302
  • 8.2" deck height, finished at 8.200" plus .010" to .015"
  • Designed with optimized cylinder wall length for stroker applications up to 3.5" with no grinding or clearancing.  (Depends on crank/rod manufacturer)
  • Splayed 4-bolt main 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 - 1995 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
  • Siamese bore
  • 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-X306/307/Z304DA 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
  • Retains clutch cross shaft pivot hole
  • Original Style oil filter location
  • Original motor mount boss locations
  • Original bell housing pattern
  • Weighs approximately 163 lbs.
  • Great price and value
  • The foundation for 8.2" deck projects

Proven performance - used in Ford Performance sealed 347cid race engines and Ford Performance high performance crate engines, a proven winner out of the crate and thousands of laps before rebuild.

 Ford Performance BOSS Blocks   

WARNING: This part is designed and intended for competition use only. It should not be installed on a vehicle that is driven on public roads and highways. Installation of this part on a vehicle driven on public roads and highways is likely to violate U.S. and Canadian laws and regulations relating to motor vehicle emissions.

Read More

Technical Specifications

Country of origin : United States
Emission type : Competition Only
UPC : 756122104392
Warranty : Not Available
Instruction sheet : Click Here
Read More

Return Policy

    Ford or the dealer (where applicable) will accept returns or exchanges of applicable Motorcraft, Ford Parts, Omnicraft, Ford Accessories, Lincoln Accessories and Ford Performance Parts within 30 days of your receipt. Once you have initiated a return, you must return the part(s) within 14 calendar days. Electronics, wheels and custom-painted parts cannot be returned at any time for any reason. All returns and exchanges must be returned to Ford (for orders shipped directly to you) or the dealer (for orders picked up from the dealer) solely at your expense, except in the case of Ford or dealer error. Returned items must be in the original box, in new, non-installed, resalable condition, with all instructions and hardware, and in the condition it was received. If all of these conditions are not met, it is at discretion of Ford or the dealer (where applicable) to accept the return. Shipping charges are non-refundable. If you opt not to provide a VIN(s), you are solely responsible for making sure the accessories you have ordered are compatible with your vehicle. Attempting to return any parts or assemblies that have been tampered with in a manner that affects the re-salability and/or safety of the part(s) is prosecutable under the law, and these parts and assemblies are not eligible for return credit, refund and/or exchange. If you believe a product sold by Ford has a condition or defect that might make it unsafe, please report this safety concern immediately by using the chat feature on the Site or by calling 1-844-589-0060.

Read More

About This Product

In the world of racing and performance, BIGGER is always better.  Ford Performance gets it -  and that's why it offers BOSS small blocks in Big Bore versions.  The Ford Performance BOSS blocks are designed to be a replacement for the legendary BOSS 302 and BOSS 351 blocks using the latest technology and manufacturing techniques available.  Cast from diesel grade iron with siamese bores, thick cylinder walls and decks, BOSS block strength is far superior to any Ford production block ever offered. 

 

Ford Performance Big Bore version of the BOSS 302 block makes it simpler and more economical to build really BIG small blocks.  To insure the most precise bore location, concentricity and integrity, the BOSS Big Bore blocks are machined an additional .125" during the initial block fixturing and boring stage.  With an unfinished bore size of 4.120", Ford Performance BOSS 302 Big Bore blocks will support engine sizes up to 363 cubic inches. 

 

The Ford Performance BOSS block capability has been proven around the world, both on the track and on the street.  And, all Ford Performance BOSS blocks are cast and machined to the highest industry standards in the USA. 

  • 4.125" bore capacity, finished at 4.115" rough bore. Also available in standard bore version, part number: M-6010-BOSS302
  • 8.2" deck height, finished at 8.200" plus .010" to .015"
  • Designed with optimized cylinder wall length for stroker applications up to 3.5" with no grinding or clearancing.  (Depends on crank/rod manufacturer)
  • Splayed 4-bolt main 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 - 1995 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
  • Siamese bore
  • 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-X306/307/Z304DA 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
  • Retains clutch cross shaft pivot hole
  • Original Style oil filter location
  • Original motor mount boss locations
  • Original bell housing pattern
  • Weighs approximately 163 lbs.
  • Great price and value
  • The foundation for 8.2" deck projects

Proven performance - used in Ford Performance sealed 347cid race engines and Ford Performance high performance crate engines, a proven winner out of the crate and thousands of laps before rebuild.

 Ford Performance BOSS Blocks   

WARNING: This part is designed and intended for competition use only. It should not be installed on a vehicle that is driven on public roads and highways. Installation of this part on a vehicle driven on public roads and highways is likely to violate U.S. and Canadian laws and regulations relating to motor vehicle emissions.

Read More

Technical Specifications

Country of origin : United States
Emission type : Competition Only
UPC : 756122104392
Warranty : Not Available
Instruction sheet : Click Here
Read More

Return Policy

    Ford or the dealer (where applicable) will accept returns or exchanges of applicable Motorcraft, Ford Parts, Omnicraft, Ford Accessories, Lincoln Accessories and Ford Performance Parts within 30 days of your receipt. Once you have initiated a return, you must return the part(s) within 14 calendar days. Electronics, wheels and custom-painted parts cannot be returned at any time for any reason. All returns and exchanges must be returned to Ford (for orders shipped directly to you) or the dealer (for orders picked up from the dealer) solely at your expense, except in the case of Ford or dealer error. Returned items must be in the original box, in new, non-installed, resalable condition, with all instructions and hardware, and in the condition it was received. If all of these conditions are not met, it is at discretion of Ford or the dealer (where applicable) to accept the return. Shipping charges are non-refundable. If you opt not to provide a VIN(s), you are solely responsible for making sure the accessories you have ordered are compatible with your vehicle. Attempting to return any parts or assemblies that have been tampered with in a manner that affects the re-salability and/or safety of the part(s) is prosecutable under the law, and these parts and assemblies are not eligible for return credit, refund and/or exchange. If you believe a product sold by Ford has a condition or defect that might make it unsafe, please report this safety concern immediately by using the chat feature on the Site or by calling 1-844-589-0060.

Read More

Shopping Cart

{{ cartItemCountWithoutLabour }} item

Your cart is currently empty.

Return To Home
Subtotal
{{ cart.total_price | money }}
Shipping
Calculated at checkout
View Cart