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 in. 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.

Additional Information

Boss Short Block Engine; 427 cu. in.; Incl. Forged Crankshaft/Forged I-Beam Connecting Rods w/Floating Piston Pins/BOSS 351 Block; Internally Balanced;

Features and Benefits

• Boss 4-Bolt Main Block

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.

• Boss 4-Bolt Main Block

Ford Performance Parts 427 c.i.d. Boss short block assemblies provide you with the perfect foundation for building your high-horsepower Boss engine. They start out with an iron 4-bolt main Boss block with a 9.500 in. deck height, then add a 4.000 in. stroke steel crankshaft and a set of forged steel H-beam connecting rods with floating pins, and top that off with a set of 4.125 in. bore forged pistons. Ford Performance Parts 427 c.i.d. Boss short block assemblies require Boss cylinder head bolts or studs and Ford Performance Parts or aftermarket cylinder heads.

Additional technical information:
• Engine type: 351 based small block Ford
• Iron 4-bolt main block with 9.5 in. deck height (M-6010-Z351)
• .005 in. below piston to deck height (nominal)
• SCAT forged steel 4.000 in. stroke crankshaft
• SCAT forged steel H beam connecting rods with floating pins and ARP bolts
• Mahle 4.125 in. forged pistons, 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; requires aftermarket tie bar hydraulic lifters
• 0.060-inch oil galley restrictors included for solid roller cam applications
• Internally balanced
• Uses standard Windsor timing cover (M-6059-D351)
• Standard Windsor oil pan flange
• Recommended cylinder head fasteners M-6065-BOSS head bolts or M-6014-BOSS studs depending on application
• Compatible with most aftermarket performance cylinder heads; designed for 20 degree valve angle heads and will fit stock or spread valve guide centerlines
• Not designed for production 302/351W or M-6049-Y302/Y303/X302/X303/X304/X305 cylinder heads
• Requires M-6051-R351 head gaskets
• High-performance harmonic balancer M-6316-D302 recommended
• Built with all new parts
• Hand assembled in the USA with performance clearances
• Photo and specifications may vary

No specific fitment data available for this part. For clarification, please contact us.

Detailed Compatibility

This may not be an exhaustive list of compatible vehicles. Please reach out to one of our representatives if you are unsure or do not see your vehicle here.