Fitment-based search is in development — powered by Convermax and SEMA Data
Edelbrock Engine Block 54903U-904 product image 1
Edelbrock Engine Block 54903U-904 product image 2
Edelbrock Engine Block 54903U-904 product image 3
Edelbrock Engine Block 54903U-904 product image 4
Edelbrock Engine Block 54903U-904 product image 5
Edelbrock Engine Block 54903U-904 product image 6
Edelbrock Engine Block 54903U-904 product image 7

Edelbrock

Edelbrock RHS LS Block 54903U-904

SKU: 54903U-904
Barcode: 36584051510

$6,904.95

Edelbrock RHS LS Block 54903U-904

Aluminum construction reduces engine block weight
Edelbrock RHS LS Block 54903U-904

Raised cam centerline allows larger stroke combinations
Edelbrock RHS LS Block 54903U-904

Six-bolt main cap layout strengthens the foundation
Edelbrock RHS LS Block 54903U-904

Performance grade block suits serious LS builds

Verified U.S. Supplier

Fitment Data Included

30-Day Returns
In stock

Warranty

Products sold by Modridge may be covered by the original manufacturer’s warranty, when applicable. Warranty terms, coverage, exclusions, and claim requirements vary by brand and product line.

If you believe your item has a manufacturer defect, contact us with your order number, product photos, and a description of the issue. We’ll help review the case and guide you through the next steps based on the manufacturer’s policy.

This warranty does not cover normal wear, improper installation, misuse, modification, racing damage, accident damage, or installation-related issues unless the manufacturer’s policy states otherwise.

Shipping & Returns

Shipping

This item ships from an authorized U.S. distributor. Processing and transit times may vary depending on stock availability and destination. Most orders ship within 1–3 business days.

Returns

Returns are accepted within 30 days of delivery. Items must be uninstalled, unused, and in original packaging. Programmers and calibration devices that have been paired to a vehicle are not eligible for return. See our Returns & Refunds page for full details.

Emissions & Compliance

Emissions Compliance Exempt
  • Visa
  • Mastercard
  • Diners Club
  • PayPal
  • American Express
Edelbrock RHS LS Block 54903U-904

$6,904.95

$6,904.95

Aluminum

Material

9.240 in

Deck

4.125 in

Bore

Product Description

Edelbrock RHS LS Block 54903U-904 is a high-performance aluminum LS engine block built for serious engine builds that need more strength and capability than a standard production block. It is a foundation component for performance assembly work, not a routine service replacement.

Aluminum construction, performance grade type, 9.240 inch deck height, 4.125 inch cylinder bore diameter, .904 inch lifter bore diameter, and a raised cam centerline intended to allow larger stroke. Those details make this block relevant for builders planning higher-output LS combinations where machining, rotating assembly clearance, and block architecture matter from the start. The block is best approached as a precision engine-building component, with machining and assembly decisions planned around the final combination.

Specifications

Brand
Edelbrock
Part Number
54903U-904
Product Type
Engine Block
Grade Type
Performance
Material
Aluminum
Deck Height
9.240 IN
Cylinder Bore Diameter
4.125 IN
Lifter Bore Diameter
0.904 IN
Warranty
12 Months
Country of Origin
US
Quantity per Application
Maximum Used in any Vehicle
GTIN
36584051510
Package Length (in)
26
Package Width (in)
20.5
Package Height (in)
17.5
Package Weight (lbs)
140

Fitment / Application

1998 | Chevrolet | Camaro
1999 | Chevrolet | Camaro
2000 | Chevrolet | Camaro
2001 | Chevrolet | Camaro
2002 | Chevrolet | Camaro
2003 | Chevrolet | Corvette
1997 | Chevrolet | Corvette
1998 | Chevrolet | Corvette
1999 | Chevrolet | Corvette
2000 | Chevrolet | Corvette
2001 | Chevrolet | Corvette
2002 | Chevrolet | Corvette
1998 | Pontiac | Firebird
1999 | Pontiac | Firebird
2000 | Pontiac | Firebird
2001 | Pontiac | Firebird
2002 | Pontiac | Firebird
2001 | Avanti | II
2002 | Avanti | II
2003 | Avanti | II
2004 | Chevrolet | Corvette
2004 | Pontiac | GTO
2005 | Chevrolet | Corvette
2005 | Chevrolet | SSR
2005 | Pontiac | GTO
2006 | Cadillac | CTS
2006 | Chevrolet | Corvette
2006 | Chevrolet | Corvette
2006 | Chevrolet | SSR
2006 | Chevrolet | Trailblazer
2006 | Pontiac | GTO
2007 | Chevrolet | Trailblazer
2007 | Cadillac | CTS
2007 | Chevrolet | Corvette
2007 | Chevrolet | Corvette
2008 | Chevrolet | Corvette
2008 | Chevrolet | Corvette
2008 | Chevrolet | Trailblazer
2008 | Saab | 9-7x
2004 | Avanti | II
2009 | Chevrolet | Corvette
2009 | Chevrolet | Corvette
2009 | Pontiac | G8
2009 | Chevrolet | Trailblazer
2009 | Saab | 9-7x
2010 | Chevrolet | Camaro
2010 | Chevrolet | Corvette
2010 | Chevrolet | Corvette
2011 | Chevrolet | Camaro
2011 | Chevrolet | Corvette
2011 | Chevrolet | Corvette
2012 | Chevrolet | Camaro
2012 | Chevrolet | Corvette
2012 | Chevrolet | Corvette
2013 | Chevrolet | Corvette
2013 | Chevrolet | Corvette
2013 | Chevrolet | Camaro
2014 | Chevrolet | SS
2014 | Chevrolet | Camaro
2014 | Chevrolet | Camaro
2015 | Chevrolet | Camaro
2015 | Chevrolet | Camaro
2015 | Chevrolet | SS
2016 | Chevrolet | SS
2017 | Chevrolet | SS

What's in the Box

• Engine block × 1

Installation & Documents

Review the installation guide before machining or assembly. Final clearances, bore finish, and rotating assembly fit should be confirmed by a qualified engine builder. Clean all oil passages thoroughly before final assembly.

Product Document