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Ford Performance Boss Short Bock
Ford Performance Boss Short Bock

Pick up at your selected dealer is free

Make the most of your vehicle – and your lifestyle

Engineered to fit your vehicle

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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

The Ford Performance 427 short block lets you build it your way by adding your choice of heads, cam, intake and oil pan.  It's the perfect foundation to build a powerful 9.5" deck engine for your vintage muscle car, street rod, Fox Body or Late Model Mustang.  This is the same short block used in the 575 HP Z427 crate engine. Nothing but the best parts are used inside including: forged crankshaft, forged I-beam connecting rods with floating piston pins and the BOSS 351 block. This short block is hand assembled with performance clearances in the US.  The 427 short block fits many of the vehicles originally built with Windsor and Cleveland small blocks. 

  • Engine type:  351 based small block Ford
  • Displacement (cu in):  427
  • Bore x stroke (in):  4.125" bore x 4.00" stroke
  • Block: Boss 4-bolt main block M-6010-BOSS35195 9.5" deck height
  • Piston to Deck Height: .005" below piston to deck height (nominal)
  • Crankshaft: SCAT Forged Steel: 4.000" stroke
  • Connecting rods:  SCAT forged steel H beam connecting rods with floating pin and ARP bolts
  • Pistons:  Mahle forged aluminum, with reliefs for Z304D, Z304P, N351, and other inline valve Windsor cylinder heads.  17 cc piston dish.  Check piston to valve clearance.
  • Hydraulic roller camshaft compatible
  • Internally balanced
  • Recommended cylinder head fasteners M-6065-BOSS head bolts or M-6014-BOSS studs depending on application
  • Most aftermarket performance cylinder heads are compatible with this short block.  Ford Performance short blocks are built with pistons designed for 20 valve angle heads and will fit stock or spread valve guide centerlines. 
  • Works well with Ford Performance cylinder heads M-6049-Z2 and M-6049-X2
  • Designed for M-6049-X306//X307/Z304DA cylinder heads. Not designed for production 302/351W or M-6049-Y302/Y303/X302/X303/X304/X305 cylinder heads
  • Assembled and ready for your heads, cam and timing chain set
  • Requires head gaskets M-6051-R351
  • 351W bolt pattern, oil pan and timing cover
  • High-performance harmonic balancer M-6316-D302 is recommended
  • Built with all NEW PARTS
  • Photo and specs may vary

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 : 756122117231
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

The Ford Performance 427 short block lets you build it your way by adding your choice of heads, cam, intake and oil pan.  It's the perfect foundation to build a powerful 9.5" deck engine for your vintage muscle car, street rod, Fox Body or Late Model Mustang.  This is the same short block used in the 575 HP Z427 crate engine. Nothing but the best parts are used inside including: forged crankshaft, forged I-beam connecting rods with floating piston pins and the BOSS 351 block. This short block is hand assembled with performance clearances in the US.  The 427 short block fits many of the vehicles originally built with Windsor and Cleveland small blocks. 

  • Engine type:  351 based small block Ford
  • Displacement (cu in):  427
  • Bore x stroke (in):  4.125" bore x 4.00" stroke
  • Block: Boss 4-bolt main block M-6010-BOSS35195 9.5" deck height
  • Piston to Deck Height: .005" below piston to deck height (nominal)
  • Crankshaft: SCAT Forged Steel: 4.000" stroke
  • Connecting rods:  SCAT forged steel H beam connecting rods with floating pin and ARP bolts
  • Pistons:  Mahle forged aluminum, with reliefs for Z304D, Z304P, N351, and other inline valve Windsor cylinder heads.  17 cc piston dish.  Check piston to valve clearance.
  • Hydraulic roller camshaft compatible
  • Internally balanced
  • Recommended cylinder head fasteners M-6065-BOSS head bolts or M-6014-BOSS studs depending on application
  • Most aftermarket performance cylinder heads are compatible with this short block.  Ford Performance short blocks are built with pistons designed for 20 valve angle heads and will fit stock or spread valve guide centerlines. 
  • Works well with Ford Performance cylinder heads M-6049-Z2 and M-6049-X2
  • Designed for M-6049-X306//X307/Z304DA cylinder heads. Not designed for production 302/351W or M-6049-Y302/Y303/X302/X303/X304/X305 cylinder heads
  • Assembled and ready for your heads, cam and timing chain set
  • Requires head gaskets M-6051-R351
  • 351W bolt pattern, oil pan and timing cover
  • High-performance harmonic balancer M-6316-D302 is recommended
  • Built with all NEW PARTS
  • Photo and specs may vary

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 : 756122117231
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

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