Engine Kits

SB Ford 331 Scat Rotating Assembly Kit
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Scat Crankshafts

SB Ford 331 Scat Rotating Assembly Kit

Part #: 1-94055
List Price: $1,980.00
Our Price: $990.00
You Save: $990.00

SB Ford 331 Scat Rotating Assembly Kit 3.250 Stroke 5.400 Rods 9.7:1 Forged Flat Top Pistons

SCAT rotating assembly using a 3.250 inch stroke to make a FORD 331 engine ( for use on small block Ford 302 engines). This kit uses 5.400-inch connecting rods with a 3.250 stroke. The kit includes the crankshaft, connecting rods, pistons, rings, rod and main bearings. The kit is SCAT # 1-94055 and includes the following parts:


  • SCAT Part # 9-302-3250-5400-2123 Series 9000 Pro Comp lightweight cast crank.
  • External balance. Crankshaft is an external balance design and would use 28oz style damper and flex plate/flywheel (not included).
  • Crank is new and journals are standard size of 2.123 inch. 
  • Micro polished journals with chamfered oil holes.


  • SCAT Part # 2-ICR5400-927 Pro Stock connecting rod.
  • Rods made from 4340 forgings using ARP 8740 3/8 cap screw bolts. 
  • The rods are a floating pin design with a .927 pin hole.


  • Keith Black FORGED piston part # KB9921.
  • Piston is a flat top 4 valve relief design (11cc).
  • Made from VMS-75 forged aluminum.
  • Approximate compression ratio of:
    • 9.8:1 with 58cc,
    • 9.1:1 with 64cc, 
    • 8.7:1 with 69cc heads.
    • (compression ratios based on .030 over).
  • Piston weight of 425-grams/ pin weight 132-grams. (Based on .030 over).
  • Spacer ring and TRU-ARC style lockrings included.
  • Pistons/rings available in: standard, .030, .040, and .060.


  • Total Seal Plasma Moly rings part # CR-9090.
  • Standard tension oil ring.
  • Rings are 5/64, 5/64, and 3/16.


  • Clevite 77 rod and main bearings (note may be substituted with Federal Mogul bearings)
Actual Engine CID 332
Assembly Lubricant Included No
Balance Style 28 oz. imbalance
Balanced No
Bore (in) 4.030 in.
Bore (mm) 102.362mm
Brand SCAT Engine Components
Cam Bearings Included No
Camshaft Included No
Connecting Rod Beam Style I-beam
Connecting Rod Material Forged 4340 steel
Connecting Rods Included Yes
Crankshaft Included Yes
Crankshaft Material Cast iron
Engine Balance External
Engine Stroke (in) 3.250 in.
Gaskets Included No
Lifters Included No
Main Bearing Undersize (in) Stock
Main Bearing Undersize (mm) Stock
Main Bearings Included Yes
Notes Kit features standard style forged pistons. I-Beam rods include 3/8 inch ARP 8740 cap screw bolts.
Oil Pump Included No
Part Type Engine Rotating Kits
Piston and Ring Oversize (in) 0.030 in.
Piston Head Volume (cc) +11.00cc
Piston Material Forged aluminum
Piston Ring Facing Material Plasmamoly
Piston Rings Included Yes
Piston Style Flat top, with two valve reliefs
Pistons Included Yes
Plastigage Included No
Product Line Scat Engine Rotating Assemblies
Quantity Sold as a kit.
Rear Main Seal Style 1-piece, 2-piece
Rod Bearing Undersize (in) Stock
Rod Bearing Undersize (mm) Stock
Rod Bearings Included Yes
Timing Chain and Gears Included No
Wrist Pin Style Floating