54901 - RHS GM LS Race Block

This part should fit your vehicle. It is a universal part.

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Part #: 54901
Notes: LS Block
Tall Deck 9.75 in.
4.125 in. Bore
MSRP: $6,073.57
Your Price: $5,970.45
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This Item Also Available In

Part Number Price Notes & Specs
54907U $6,110.94 Notes LS Race Block
GM
Standard Deck 9.250
No Water Jackets
54900 $5,970.45 Notes LS Block
Tall Deck 9.75 in.
4.165 in. Bore
54900U $4,849.01 Notes LS Block
Tall Deck 9.75 in.
Hone To 4.165 in.
54906 $5,970.45 Notes LS Block
Standard Deck 9.24 in.
3.900 in. Bore
54906U $5,904.83 Notes LS Block
Standard Deck 9.24 in.
Hone To 3.895 in.
54902 $6,029.41 Notes LS Block
Standard Deck 9.24 in.
4.165 in. Bore
54903U $5,847.08 Notes LS Block
Standard Deck 9.24 in.
Hone To 4.120 in.
54904 $5,904.83 Notes LS Block
Tall Deck 9.760 in.
4.100 in. Bore
5.87 Cylinder Sleeve Length
Unfinished
54905 $5,847.08 Notes LS Block
Standard Deck 9.250 in.
4.100 in. Bore
6.38 in. Cylinder Sleeve Length
Unfinished
54902U $5,847.08 Notes LS Block
Standard Deck 9.24 in.
Hone To 4.160 in.
54901U $5,847.08 Notes LS Block
Tall Deck 9.75 in.
Hone To 4.120 in.
54903 $5,970.45 Notes LS Block
Standard Deck 9.24 in.
4.125 in. Bore
549102 $123.29 Notes Cam Thrust Bearing
LS Block Only
Brass
549401-SET $261.12 Notes LS Race Block Head Gasket Set
For 4.125 in. Bore
Incl. PN[549401-L/549401-R]
Engine Make/Size Chevy LS Series
549204-1 $2.94 Notes LS Block Thrust Plate O-Ring
Replacement O-Ring For Thrust Plate
549306-1 $0.81 Notes Cam Retainer Plate Bolt
549402-SET $285.36 Notes LS Race Block Head Gasket Set
For 4.2in. Bore
Incl. PN[549402-L/549402-R]
Engine Make/Size Chevy LS Series
549201-1 $3.04 Notes Main Cap Dowel Pin
For LS Aluminum Race Block Main Caps
549101 $56.91 Notes Rear Seal Cover
For RHS LS Block
549120 $705.28 Notes Piston Oiler Kit
LS Race Block
Billet Alloy Steel
54908U $6,677.53 Notes LS Race Block
GM
Tall Deck 9.750
No Water Jackets
549150 $1,319.53 Notes LS Block Torque Plate
For Use w/Fire Ring On 4.125 in. Or 4.165 in. Gasket
549200-1 $12.26 Notes Aluminum -12AN Port Plug
For LS Aluminum Race Block
Fitting Size -12AN
Material Aluminum
549400-SET $261.12 Notes LS Race Block Head Gasket Set
For 4 in. Bore
Incl. Right And Left Gaskets
Engine Make/Size Chevy LS Series

All Fitments

UNIVERSAL
Year Model SubModel Cylinders Liter Aspiration Eng Desg. Fuel Notes
0 - 0 NON APPLICATION SPECIFIC ALL ALL ALL ALL ALL ALL

Product Description

This new block is built specifically for the drag race market and is an ideal fit within rules that do not allow billet blocks by specifying they must be cast. A solid water jacket design featuring A357-T6 aluminum material provides the superior crankcase strength and improved rigidity perfect for crank-mounted superchargers and blowers. The block utilizes the LSX 6-head-bolt design as in the original LS Race Block, but the head stud fasteners’ diameter has been increased to 1/2” for the inboard head studs and 3/8” for the 5th and 6th head bolts. The larger fasteners provide additional clamping force for increased head gasket retention. This is required for the higher cylinder pressures common in boosted applications.

  • 4.100” Bore, solid water jacket design
  • Larger head stud fasteners
  • Standard & tall deck options
  • Strict quality control measures

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