The Ford Performance 347 shortblock 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 8.2" deck engine for your vintage muscle car, street rod, Fox Body or Late Model Mustang.  This is the same shortblock used in the 347 sealed racing crate engines, Part number M-6007-D347SR and M-6007-S347JR.  Nothing but the best parts are used inside including: forged crankshaft, forged I-beam connecting rods with floating piston pins and the BOSS 302 block.

  • Engine type: 302 based small block Ford
  • Displacement (cu in): 347
  • Bore x stroke (in): 4.030" bore x 3.400" stroke
  • Block: Boss 4-bolt main block M-6010-BOSS302  8.2" deck height
  • Piston to Deck Height: .010" below deck (nominal)
  • Crankshaft: SCAT® Forged Steel: 3.400" stroke
  • Connecting rods: SCAT® forged steel I-beam connecting rods with floating pin and ARP® bolts
  • Pistons: Mahle® forged aluminum, 1.5mm, 1.5mm, 3.00mm rings, valve reliefs for X306, X307, Z304DA, Z304P, N351, Z2, X2 and other inline valve Windsor cylinder heads. 6 cc valve pockets. Check piston to valve clearance.
  • Hydraulic roller camshaft compatible
  • Internally balanced. Requires “0” balance flywheel and damper
  • 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 degree valve angle heads and will fit stock or most 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/Z304P and N351 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-CP331 or M-6051-S331 
  • High-performance harmonic balancer M-6316-D302 is recommended
  • High volume oil pump M-6600-D2 recommended
  • 302 bolt pattern, oil pan and timing cover
  • Built with all NEW PARTS
  • Photo and specs may vary  

Part Type
Engine: Short Blocks
Instruction Sheet
Warranty Availability
Not Available
Package Dimensions
25" x 24" x 31"
Package Weight
311 lb(s)
UPC Code
Country of Origin
United States