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

Market Price $1,088.99 You Save 12% ($127.00)
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$961.99 (kit)

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  • Item 100531
  • MPN# 1-94055

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    Features, Video & 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

    Review & Installation Video

    Review & Install Video

    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
    Tech Specs
    Will it fit my Mustang?

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    Questions & Answers (11)

    5 Top Rated Questions

    can this be used with stock heads

    • The Scat Stroker Series 9000 331 ci Street-Strip Rotating Assembly can be used with stock heads, however the stock heads would be a major bottleneck, severely limiting the performance potential.

    Helpful (1)

    With this kit. I use a 28oz flywheel and balancer. Does that mean it does not have to go to a machine shop to get balanced.

    • It is required to have this kit professionally balanced before installation, and will also require the use of a 28oz balancer and flywheel.

    Helpful (0)

    Valve relief on pistons, I am planning on using trick flow 11R twisted wedge heads will these pistons clear if not will I be able to purchase this kit with a set with proper valve relief

    • The Scat Stroker Series 9000 331 ci Street-Strip Rotating Assembly will use inline valve reliefs.

    Helpful (0)

    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.

    • 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.

    Helpful (0)

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

    • 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.

    Helpful (0)
    Post Your Question
    6 More Questions
    are the connecting rods forged 4340 ? 1 answer
    Whats the hp rating on this stroket kit 1 answer
    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. 1 answer
    Can you please provide details of piston; maker, CC, Compression Height, etc. Thans 1 answer
    Will this clear the oil pan Will this clear the factory oil pan on 89 5.0 ho 2 answers
    What do i need in terms of a balancer/flywheel I understand that this kit is set up for 28oz balance. I am assuming i need a 28oz balancer but what do i do for a flywheel? 1 answer

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    Customer Reviews (1) Write a Review

    Overall Rating 5

    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 (5)

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