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Butler Crate Engine 505-541 cu.in. w/ IAII Block Turn Key


505-541 cu.in. Crate Engine with IA II block

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505-541 cu.in. Crate Engine with IA II block

Aftermarket Block-sonic tested, completely deburred, bored and honed with torque plate - line honed, deck squared, cam bearings

  • Forged or Billet Crank 4.250 - 4.500 Stroke 2.200 Rod
  • Eagle Rods 6.800", ARP 2000 Bolts
  • Ross Pistons by BP 4.350 - 4.375" bore (Any Compression Ratio Avail.)
  • Ferrea Pins .990 x 2.930"
  • Rings Total Seal/Classic Race
  • Race Bearings Rods, Mains CL or FM
  • BP Billet Timing Gears & Chain
  • Main Studs
  • Comp Flat Tappet, Hyd. Roller, or Solid Roller Cam
  • Roller Rockers
  • Canton Oil Pan
  • Butler Pro Oil Pump
  • HD Oil Pump Drive Shaft
  • Performance Damper
  • Timing Cover
  • Edel. Heads, Ported, Ferrea Valves, BP Valve Job, Springs, 10deg Retainers/Locks, 7/16 Studs
  • Intake
  • Choice of FAST or Holley EFI
  • Choice to add EFI Tank Solution. Click here to see EFI Solution Kits
  • Water Pump
  • BP Push Rods
  • BP Aluminum Valley Pan
  • Internally Balanced
  • Assembled With Blueprint Sheet


BP 505-541 c.i. Crate Engine w/aftermarket block

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Standard with every IA II block**
  • Siamese Cylinders: 4.170 to 4.400" bores with min. of .200 wall thickness @ 4.400 bore. This provides outstanding cylinder wall rigidity. No other block has this
  • All steel registered main caps: With splayed four bolt pattern on the three center mains which adds rigidity
  • Block cast: Allows clearance for 4.750 stroke crank.
  • Main webs: Strengthened to maximum width possible.
  • Cam tunnels: Reinforced.
  • Wider pan rails: Provides better oil pan gasket sealing and gasket retention.
  • Thicker deck surfaces: Provides added strength and aids in cylinder head sealing
  • Solid lifter galley: With drilled oil returns that prevents lifter bore breakage and adds strength
  • Improved oiling: Front main oil feed, which adds longevity and helps prevent front main bearing "starvation".
  • Bottom of the block: Is solid to the bend, above the pan rail, for added strength
  • IA II Blocks have Redesigned Block Cooling Passages: Improves cooling to all cylinders.
  • Provisions for external cooling: 1/2" NPT holes provided at rear of block. Gives you the option to dry deck the block.
  • Dual bell housing bolt patterns: For both Pontiac and "corporate" housings.
  • Lifter bores: Are deeper to allow the use of standard type "corporate" lifters.
  • Bottoms of cylinders: Are notched to clear strokes up to 4.75". A 5.0" stroke is possible with some grinding.
  • Head bolt bosses: Are tied to cylinder walls and the exterior block walls are thicker for added strength.
  • Oil filter passages: Are threaded for easy remote filter mounting. Oil pump passages have corner plugs at 90 degree turns to reduce flow restriction. (Plugs are included with kit.)
  • Threaded front external oil passage: for lubricating superchargers or turbo's. The IA II Block uses standard Pontiac 5 bolt Motor mount pattern.
  • Standard deck height: IA II Blocks are available with 3" or 3 1/4' ' mains .
  • Threaded freeze plug holes: For safety and wall rigidity. (Freeze plugs are provided with block.) This lessens the chance of the engine blowing out a freeze plug. 

  • * Drilling is required to match your heads water holes. Estimated drilling time; 10 minutes.
  • There is no longer a material alloy surcharge!
  • Our IA II blocks are machined buy one of the best aftermarket engine machine shops in the country. All blocks are check out on a CNC coordinate measuring machine with-in process probing during manufacturing. We pressure test and sonic check every block. IA II Blocks come with a full warranty for material and workmanship.
  • ALL Blocks are shipped DRY DECK*

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


  • BP-Crate-505-541-EFI
  • BP-Crate-505-541-EFI
  • Butler Performance
  • New

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