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Butler Performance Budget Short Block, 389 Block, 447-454 ci, 4.250" Stroke (Assembled)

BP-SB-389-4250

  • Customized Butler Performance Short Block
  • 4.250"Stroke
  • Great budget friendly package tailored to you
  • Rated for up to 500hp only
  • All short blocks undergo the "Butler Process"

Please Call for Availability
(866)762-7527
Availability: Contact us for lead time

Description

406-412 CI short block (Assembled)
Complete Internally Balanced rotating assembly prepped block

  • 4.250" stroke Cast or Forged crank
  • Internally Balanced
  • Choose Flat Top, Dish, or Dome Pistons- Add head casting or head cc info at checkout and we will confirm compression ratio
  • Total Seal Rings- File Fit
  • 6.88" H-Beam Rods
  • Performance Rod Bearings
  • Performance Main bearings
  • Includes Viton Rear Main Seal
  • 389 prepped block
    • cleaned
    • magnafluxed
    • sonic tested
    • completely deburred
    • bored and honed with torque plate
    • line honed with ARP main studs
    • deck squared
    • cam bearings and brass freeze plugs installed
    •  Assembled by a Butler Engine Specialist

Included reusable engine cradle

Images for display purposes only and could show optional parts. Contact us for a custom quote for your application and specifications

Compression Calculator

400 Block Head cc w/-8cc Flat top
Stroke Bore 72cc 87cc 96cc
3.750" 4.155" 10.38 9.02 8.38
  4.181" 10.48 9.11 8.46
4.000"

4.155"

11 9.55 8.87
  4.181" 11.12 9.65 8.96
4.210" 4.155" 11.53 10 9.28
  4.181" 11.65 10.1 9.38
4.250" 4.155" 11.63 10.09 9.36
  4.181" 11.75 10.19 9.46
4.500" 4.155" 12.25 10.62 9.85
  4.181" 12.38 10.73 9.96
Click here to use our compression calculator to calculate compression with thicker head gaskets, decked block, or other variables.

Details

  • BP-SB-389-4250
  • BP-SB-389-4250
  • Butler Performance
  • Contact us for lead time
  • New

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