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Crate Engine Builder Kit by Butler, 450-550hp, 487-501 cu. in. Ready to Assemble


  • Butler Performance Crate Engine in Builder Kit form- EFI or carb, Ready to assemble
  • Includes Butler Balanced Rotating Assembly
  • 4.500" Stroke Forged Crank/H-Beam Rods
  • Custom machined and ready to assemble
  • All engine blocks undergo the "Butler Process"
  • Edelbrock Heads and Intake
  • Comp Cam and Roller Lifters
  • EFI or Carb
  • Fully machined and ready to assemble
  • Builder Kits are shipped unassembled. Must be assembled by you or your shop

Availability: Due to Popular Demand current lead time runs about 12-14 weeks Fully insured shipping will be quoted. (Usually $500-700 on average). Additional fees for residential and liftgate.
Pricing: $15,495.00

Customize Your Item

- Choose Your Block -
 * required
- Choose Your Block Color -
 * required
- Choose Your Rods -
 * required
- Choose Main Cap Upgrade -
 * required
- Choose Your Oil Pump -
 * required
- Choose Your Oil Pan -
 * required
- Choose Your Cam Idle Quality -
 * required
- Choose Your HP Level -
 * required
- Choose Your Heads -
 * required
- Choose Your Cylinder Head Stealt -
 * required
- Choose Your Ignition -
 * required
- Choose Your Induction -
 * required
- Choose Your Valve Covers -
 * required
- Choose Your Flexplate/Flywheel -
 * required


Butler Crate Engine in Builder Kit form- Ready to Assemble

487-501cu. in.


Ready to Build Engine Kits

All our ready to assemble crate engine kits leave our shop having been custom designed, put through the "Butler Process", and ready to build. We never simply sell kits with no assistance. You have Butler Performance backing you in every step of the way. From knowledge to tech help, we are here for you or your engine builder of choice. We have worked with many engine shops around the country and are always glad to lend a hand in helping them take the "Butler Kit" to a performance engine specially designed for your project.

Our Butler Crate Engine Builder Kits have the following parts and more

  • 400, 428, or 455 Pontiac Block with Option for 4-Bolt Main With Main Studs upgrade, Dip Stick tube installed
  • Butler Rotating Assembly- With Crank, H-Beam Rods, Forged Pistons and bearings
  • Cast or Forged Crank 4.500 Stroke
  • H-Beam Rods 6.800"
  • BP Forged Pistons and Pins
  • Total Seal Rings
  • C77 Race Bearings
  • BP Billet Gears and Chains
  • High Volume Oil Pump
  • BP/COMP Hyd Roller Cam
  • Hyd Roller Lifters
  • BP Custom Pushrods 5/16 .116" Wall
  • SFI Damper
  • Roller Rockers
  • Edelbrock Out of Box Heads
  • Carb or EFI of your choice
  • Stock Type or Canton Oil Pan & Pickup
  • Port Matched Intake
  • TPP Valley Pan
  • Flowkooler Water Pump
  • New 11 Bolt Timing Cover, Plates, and Sleeves
  • Ignition Kit
  • IMI Starter
  • Engine Paint and Valve Cover Options
  • All gaskets and stainless steel accessory and ARP fasteners

The Block

We start with the exact same blocks you would build on your own. It's what we do to take these old dirty blocks that you see here to a beautiful custom built Butler engine. It takes many critical steps in order to become the proper foundation to be a custom Butler Performance engine.

Step 1- 3 Step Cleaning Process

-Baked, Blasted, and Cleaned

Step 2- Visually Inspected

Step 3- Magnafluxed/Sonic Tested

Step 4- Replace Dowel Pins

Step 5- Align Bored (if required)/ Align Honed

Step 6- Bored and Honed with a Torque Plate

Step 7- Square Decked

Step 8- Deburred/ Final Multi Prep Process

 (It takes over a full days work for the final prepping process. Including tapping all bolt holes and cleaning all oil galleys)

Step 9- Final Jet Wash/Cleaning/Wipe Down

Step 10- Ready for Assembly

All rotating assemblies sold by Butler Performance, regardless of brand, are neutrally balanced in our shop by our experienced machinists.

Images show assembled with optional parts. Contact us for detailed quote for your application and specifications.

Drive, accessory pulleys, and March Serpentine systems sold separately

Air cleaner or drop base sold separately



  • BP-ENGINE-KIT-487-501
  • BP-ENGINE-KIT-487-501
  • Butler Performance
  • Due to Popular Demand current lead time runs about 12-14 weeks Fully insured shipping will be quoted. (Usually $500-700 on average). Additional fees for residential and liftgate.
  • New

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