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Speedy Bill
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Rotating Assemblies

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Rotating Assemblies
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Shop Rotating Assemblies At Speedway Motors

When you're ready to get serious about your engine, check out our massive selection of custom rotating assemblies. Our engine rotating kits provide the perfect combination of pistons, connecting rods, and crankshafts to optimize power and durability, without maxing out your budget. We've got the rotating kits for a wide variety of applications from small block Chevys to flathead Fords and everything in between. Take the guesswork out of picking engine components - we'll help you pick out the perfect rotating kit for your ride.

Rotating Assemblies

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Featured Products
  • Product Rating: 5.00 Stars
    $1,699.99
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    These 1939-53 flathead stroker kit rotating assemblies feature new Scat crankshafts, new Scat H-beam connecting rods with 2" journals, Ross forged three-ring pistons, rod bearings, and piston rings. The components are balanced and ready for you to assemble.

    Main bearings sold separately. If you have a '39-'48 engine you will need a set of 9101535-STD main bearings. A '49-'53 engine will require a set of 9101536-STD main bearings.

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  • New
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    $2,203.99 $2,099.99
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    This cylinder block complete rotating assembly is just what you need to get your Small Block 305 Chevy performing at its best.  Designed for use with Sprint and Oval Track racing applications, this kit comes with crankshaft, connecting rods, pistons, rings, and all bearings necessary.

    Kit Includes:

    • Callies SAF113-CM S/B Chevy 350 Crankshaft, Compstar 4340, 5.7 Rod
      • Material is precisely located to yield the greatest advantage in terms of both strength to weight, and balance ability.
      • Properly placed counterweights to improve balance and reduce bearing loads
      • Rough machined forgings in a process that includes double stress relief operations that make these crankshafts very dimensionally stable.
      • Hardened with a deep nitride, Compstar cranks are ideal for all types of abusive racing environments
      • All rod journals are drilled and counterweights are profiled for piston clearance.
      • With a consistent grind and polish, along with precise stroke and index, you will see why we say these crankshafts are Compstar Correct!
    • MAHLE Small Block Chevy 305 PowerPak Pistons
      • Race proven lightweight forged design that are complete with rings, wrist pins, and locks
      • Made from 4032 aluminum alloy to allow for tighter cylinder to wall clearances, and improved temperature stability
      • Forged piston for performance applications Fully-machined crown
      • Grafal anti-Friction coating on skirts
      • Phosphate-coated to reduce micro-welding and pin galling
      • Pin bores finished on CNC boring equipment
      • Deburred
      • High strength, light weight steel pins
      • Race proven round wire locks
      • Low drag ring pak
      • Lightweight slipper kirt forgings
      • 1.5, 1.5, 3.0mm file fit performance ring set included. For 305 c.i. S/B Chevy (3.736" bore x 3.48" stroke)
        • C/R 58cc:  10.0
        • C/R 64cc:  9.3
        • C/R 70cc:  8.7

    Notes:

    1) Mahle’s Grafal skirt coating reduces drag, scuffing, friction and cylinder bore wear; reduces piston noise.

    2) Phosphate coating provides the grey appearance to the Mahle piston. This dry lubricant coating (not to be confused with a thermal film coating) provides a lubricant film in the pin bores and ring grooves until the oiling system of the engine reaches operating pressure; particularly useful during the initial start-up or break-in of engines to protect against galling and microwelding. The piston crown is still machineable.

    3) The location to measure piston-to-wall clearance for each application. This point is calculated from the bottom of the piston skirt and indicates the widest part of the piston and thus where to measure.

    • Comp Height:  1.550" 
    • Pin Diameter:  .927"
    • Clearance Guide:
      • *Meas. = 0.894
      • Min = 0.0025
      • Max = 0.0033
    • King HP Series 1969-Up Small Block Chevy Rod Bearings
      • S/B Chevy Large Journal 350/400 - 2.100" Rods
      • Bi-metal aluminum silicon alloy featuring fine micro-bore finish
      • Mains and rods are narrowed for large radius crankshafts
      • Greater rod bearing height improves bearing-to-bore contact/heat transfer and reduces spin potential at high RPM
      • 0.015" thick top layer for superior macro particle embedability and conformability
      • 40 Vickers hardness to resist overlay migration and extrusion
      • 450°F heat threshold for superior protection against friction and overheating
    • King HP Series Chevy 350 Main Bearings
      • Bi-metal aluminum silicon alloy featuring fine micro-bore finish
      • Mains and rods are narrowed for large radius crankshafts
      • Mains are 3/4 grooved for improved oiling to the rod journals
      • Greater rod bearing height improves bearing-to-bore contact/heat transfer and reduces spin potential at high RPM
      • 0.015" thick top layer for superior macro particle embedability and conformability
      • 40 Vickers hardness to resist overlay migration and extrusion
      • 450°F heat threshold for superior protection against friction and overheating

    Application:

    • High-load, short-duration racing such as drag racing, tractor pulls, monster trucks, etc. 
    • Medium-load, long-duration racing such as circle track engines using nodular cast iron crankshafts
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  • No Reviews
    $1,699.99
    Quick View Details
    x
                

    These 1939-53 flathead stroker kit rotating assemblies feature new Scat crankshafts, new Scat H-beam connecting rods with 2" journals, Ross forged three-ring pistons, rod bearings, and piston rings. The components are balanced and ready for you to assemble.

    Main bearings sold separately. If you have a '39-'48 engine you will need a set of 9101535-STD main bearings. A '49-'53 engine will require a set of 9101536-STD main bearings.

    Go to Product Page
  • On Sale
    No Reviews
    $599.99 $589.99
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                Speedway introduces rotating assembly engine rebuild kits, with an optional balance job. Includes 2-pc rear main seal cast steel crank, rods and pistons. Cranks are new so they use standard size bearings. 

    All balancing is done with our state-of-the-art Hines balancer by race mechanics with over 30 years of experience! A kit purchased with the optional balance job will ship in 24-48 hours.

    NOTE: Piston rings are not included and must be purchased separately.

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  • On Sale
    No Reviews
    $624.99 $609.99
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    x
                Speedway introduces rotating assembly engine rebuild kits, with an optional balance job. Includes 2-pc rear main seal cast steel crank, rods and pistons. Cranks are new so they use standard size bearings. 

    All balancing is done with our state-of-the-art Hines balancer by race mechanics with over 30 years of experience! A kit purchased with the optional balance job will ship in 24-48 hours.

    NOTE: Piston rings are not included and must be purchased separately.

    Go to Product Page
  • On Sale
    No Reviews
    $624.99 $599.99
    Quick View Details
    x
                Speedway introduces rotating assembly engine rebuild kits, with an optional balance job. Includes 2-pc rear main seal cast steel crank, rods and pistons. Cranks are new so they use standard size bearings. 

    All balancing is done with our state-of-the-art Hines balancer by race mechanics with over 30 years of experience! A kit purchased with the optional balance job will ship in 24-48 hours.

    NOTE: Piston rings are not included and must be purchased separately.

    NOTE: These rotating assemblies may require additional charges for heavy metal.

    Go to Product Page
  • No Reviews
    $1,699.99
    Quick View Details
    x
                

    These 1939-53 flathead stroker kit rotating assemblies feature new Scat crankshafts, new Scat H-beam connecting rods with 2" journals, Ross forged three-ring pistons, rod bearings, and piston rings. The components are balanced and ready for you to assemble.

    Main bearings sold separately. If you have a '39-'48 engine you will need a set of 9101535-STD main bearings. A '49-'53 engine will require a set of 9101536-STD main bearings.

    Go to Product Page
  • New
    No Reviews
    $2,099.99
    Quick View Details
    x
                

    These forged 4340 steel Scat 305 Small Block Chevy rotating assemblies feature I-beam connecting rods, an internally balanced forged crankshaft, and are ready for your next circle track racing engine.

    • Scat Forged crankshaft has been internally balanced
    • Scat Pro series rods
    • Mahle flat top pistons
    • Mahle rings
    • Clevite rod and main bearings
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$659.99
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$2,227.99
Made to Order
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$899.99 $869.99
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$624.99 $609.99
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$579.99 $569.99
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$634.99
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Product Rating: 5.00 Stars
$1,549.99 $1,439.99
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$824.99 $819.99
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Product Rating: 5.00 Stars
$1,699.99
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From: $1,430.99
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$1,699.99
In Stock | Same Day Shipping
No Reviews
$1,430.99
In Stock | Same Day Shipping
On Sale
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$1,549.99 $1,439.99
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$624.99 $599.99
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$999.99 $799.99
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$879.99
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$849.99
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From: $1,399.99
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$949.99
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On Sale
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$874.99 $869.99
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On Sale
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$924.99 $899.99
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On Sale
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$624.99 $609.99
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$649.99
In Stock | Same Day Shipping
On Sale
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$874.99 $859.99
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No Reviews
$899.99
In Stock | Same Day Shipping
No Reviews
$899.99
In Stock | Same Day Shipping
On Sale
No Reviews
$599.99 $589.99
In Stock | Same Day Shipping
No Reviews
$949.99
In Stock | Same Day Shipping
New
No Reviews
$2,099.99
In Stock | Same Day Shipping
On Sale
Product Rating: 5.00 Stars
$1,549.99 $1,439.99
In Stock | Same Day Shipping
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