Butler Performance Custom Short Block Kit, 400 Block, 406-412 ci, 3.750" Str (Unassembled)

SKU: BP-SB-Kit-400-3750

Customized Butler Performance Short Block Kit
Choose Bore Size
3.750" Stroke
Great budget friendly package tailored to you
All short blocks undergo the "Butler Process"

Availability: 14-16 Week Lead Time. Ships to business address. Residential or liftgate are available for additional charges

Pricing: $4,799.00

Customize Your Item

Piston type may change depending on compression ratio desired with your particular head cc. Our techs will verify all compression numbers before proceeding with piston selection on our end.

Choose Your Piston Option

- Choose Your Piston Option -

* required

Recommended CR for pump gas is +/- 9.5:1 for cast iron heads and +/- 10.5:1 for Aluminum heads. Dish or dome pistons can be designed and selected to achieve your desired CR for an additional charge.

Option for Billet Center, Front, or Rear Main Caps with Line Hone and machining necessary for the upgrades

Choose Main Cap Upgrade

- Choose Main Cap Upgrade -

* required

Qty:

Description

406-412 CI short block kit
Complete Internally Balanced rotating assembly prepped block

3.750" stroke Cast or forged crank
Internally Balanced
Available Bores- 4.150" (.030" over), 4.160" (.040" over), and 4.18" (.060" over)
Icon Flat Top Pistons
Total Seal Rings- File Fit
6.625" I-Beam Rods on 3.750" Stroke
6.635" H-Beam Rods on 4.000" Stroke
Performance Rod Bearings
Performance Main bearings
400 (Not the 557 Model) 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
- ready to assemble

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

SKU: BP-SB-Kit-400-3750
Stock #: BP-SB-Kit-400-3750
Brand: Butler Performance
Availability Remarks: 14-16 Week Lead Time. Ships to business address. Residential or liftgate are available for additional charges
Condition: New