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Scat Stroker Series 9000 331 ci Street-Strip Rotating Assembly (79-95 5.0L)

Market Price $1,059.99 You Save 9% ($98.00)
Our Price

$961.99 (kit)

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  • Item 100531
  • MPN# 1-94055

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Features & Details

  • Scat Series 9000 Street-Strip Rotating Assembly
  • Punch Out Your 302ci to a 331ci for More Power
  • Includes Cast Crankshaft, I-Beam Connecting Rods, and Forged Flat Top Pistons
  • 4.030" Bore
  • 3.250" Crank Stroke
  • 5.400" Rod Length
  • Compression Ratio 10.4:1 W/58cc; 9.7:1 W/64cc; 8.9:1 W/70cc
  • Unbalanced Kit - Use 28oz Balancer & 28oz Flywheel/Flexplate
  • Fits 1979 to 1995 5.0L Mustangs
Stroker Kit. There is no replacement for displacement, so punch out your 302 V8 to a more respectable 331 for more asphalt-chewing horsepower with a Scat Stroker Series 9000 Street-Strip Rotating Assembly.

Kit Includes. Maximize the displacement of your engine with a cubic inch-enhancing stroker kit that includes a 9000 Series cast crankshaft, Pro Stock I-beam connecting rods with ARP 8740 3/8" cap screw bolts, forged flat top pistons as well as rings and main & rod bearings.

Compression Ratio. The Scat Stroker Kit will allow for different compression ratios depending on the heads installed. Examples: 10.4:1 with 58cc heads; 9.7:1 with 64cc heads; 8.9:1 with 70cc heads.

Unbalanced Kit. This Rotating Assembly comes unbalanced and will need to be professionally balanced before installation. It requires the use of a 28 oz harmonic balancer as well as a matching 28 oz flywheel or flexplate.

Application. This Scat Stroker Series 9000 331ci Street-Strip Rotating Assembly Kit is designed to fit 1979 to 1995 Mustangs equipped with the iconic pushrod 5.0L engine including the 5.0 LX, GT and SVT Cobra models.

Fitment: 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 Details

What's in the Box
  • (1) Crankshaft
  • (8) Connecting Rods
  • (8) Pistons
  • Rings
  • Bearings
Installation Info
Will it fit my Mustang?
  • Foxbody - 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93
  • Cobra - 93, 94, 95
  • GT - 94, 95

Customer Photos

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8 Questions / 6 Answers

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Hey there. I'm building up an 1988 302 and was wondering a couple of things. The rough bore came out to 20 over. "4.020" and was wondering if i could order the kit through you guys at 20 over instead of 30 over. Also, is the kit capable of being internally balanced? or will I have to go with an external balance.


Helpful (0)
  • Hello! We only offer the Scat Stroker Series 9000 331 ci Street-Strip Rotating Assembly with a bore of 4.030. It will require the use of a 28oz Harmonic Balancer.


Does it have to be balance or can u put 28oz Hermonicbalancer


Helpful (0)
  • The Scat Stroker Series 9000 331 ci Street-Strip Rotating Assembly does not come balanced, and would require you to use a 28oz harmonic balancer and a 28oz flywheel or flexplate.


are the connecting rods forged 4340 ?


Helpful (0)
  • The connecting rods are forged 4340 steel.


Whats the hp rating on this stroket kit


Helpful (0)
  • There really is no HP rating on this kit. The rating of HP will depend on the modifications on your car. For example, if you have replaced the heads with aftermarket ones and same goes for other items such as the camshafts, intake, etc. The minimum and maximum HP will vary.


will this kit fit my 1966 Ford Mustang? (289 ci block). I noticed in the description its listed that it fits a 302 ci block. Just wanted to be sure before I purchased it.


Helpful (0)
  • With the Scat Stroker Series 9000 331 ci Street-Strip Rotating Assembly (79-95 5.0L), we are only able to confirm fitment on the 1979 through 1995 Ford 5.0L motor. I would recommend contacting Scat directly to confirm fitment for your application.


Can you please provide details of piston; maker, CC, Compression Height, etc. Thans


Helpful (0)
  • The Scat Stroker Series 9000 331 ci Street-Strip Rotating Assembly has the follow dimensions: Stroke of 3.250" Length of 5.400" Manufacture is Icon Class: Forged Bore: 4.03 Type: Flat CC: -11cc Crank: Scat Series 9000 Cast Pro Comp Stroker Lightweight Crankshafts Item # 9-302-3250-5400-2123 Crankshaft Material: Cast steel Engine Balance: External, 28 oz. imbalance Lightened: No Requires Narrow Bearings: No Rod Bearings Included: No Main Bearings Included: No Rod Journal Diameter (in): 2.123 in. Rod: Scat Pro Stock I-Beam Connecting Rods Item # 2-ICR5400-927 Connecting Rod Material: Forged 4340 steel Connecting Rod Finish: Polished and shot-peened Wrist Pin Style: Floating Clearanced for Stroker: Yes Cap Retention Style: Cap screw Connecting Rod Bolt Brand: ARP Connecting Rod Bolt Diameter: 3/8 in. Connecting Rod Bolt Material: 8740 chromoly steel Fastener Yield Strength (psi): 200,000 psi Connecting Rod Bolt Head Style: 12-point Big End Bore Diameter (in): 2.1230 in. Pin End Bore Diameter: 0.927 in. Big End Width (in): 0.830 in.


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Customer Reviews (1) Write a Review

Overall Rating 5.0

out of 5 stars

  • Performance Gain 5 5
  • Fit 5 5

  • 5/5

    February 22, 2017


    Not installed yet but I'm a huge fan of the quality of this product. Can't wait to install


    Year: 1995 Submodel: GT

    Helpful (0)

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