RHS LS Block, Tall 9.750" Deck, .904 Lifter, 55 Roller Cam Bearing Machined Only (54901U-904)
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Compatibility
- Platform
- LS/LT
- Vehicle-specific fitment
- Review application details below
- Need help?
- Confirm fitment with us before ordering — (714) 202-7886
We list the engine platform a part is built for. That is not year-and-trim application data, so it does not confirm a fit on your specific vehicle.
- Install quoted on request. We fit parts in-house in Huntington Beach, but we do not publish a labor figure for this item — we would rather quote your car than guess. Call (714) 202-7886 or pick Install at HRC and add your vehicle details, and we will come back with the labor.
- Warranty & track disclaimer — read before you race it.
- Shipping & returns — rates and RMA terms.
- Installed in-house in Huntington Beach, CA — labor & service policy.
- Affirm and PayPal available at checkout.
More ways to pay at checkout
Engineers at RHS® have designed a high-performance aluminum engine block for GM LS applications to meet the needs of race and street performance engine builders alike. To go beyond the limitations of other existing LS blocks, the new RHS® LS Race Block is available in both standard deck and tall deck height configurations. Additionally, this innovative aluminum block features a raised cam centerline and outboard priority main oiling to allow rod clearance for a 4.600” stroke and to minimize windage in the crankcase. And for quality control assurance, RHS® conducts a CT scan (similar to a medical CAT scan) on each block to ensure maximum casting precision and consistency. When you combine unmatched finishing quality with added clearance for increased stroke applications, precision computer aided design and extra surface material to allow custom machining, you get the new benchmark for LS horsepower, torque and durability.
- RHS LS Block, Tall 9.750" Deck, .904 Lifter, 55 Roller Cam Bearing (Machined Only) - Hone to 4.120"
| Part Type | Engine Block |
|---|---|
| Prop 65 Y/N | Y |
| Prop 65 - Long Label | WARNING: This product can expose you to Lead, Nickel, Chromium and other chemicals known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, visit www.P65warnings.ca.gov. |
| 4098 | 4.125" |
| 6618 | 8 |
| 6621 | 9.76" |
| 10 | Aluminum |
| 4089 | 6 |
| 3390 | Performance |
| Lifter Bore Diameter | 0.904" |
| Cam Housing Bore Diameter | 55mm roller bearing or 60 mm babbit |
| Required Products | 549401-SET or 549402-SET or 549403-SET or 549404-SET and 5496 or 5497 |
| Related Products | 70361251-8 70362501-8 70363001-8 70364001-8 70340001LUN 70840001LUN |
| Manufacturer | RHS |
| Weight | 140 lb |
| UPC | 036584051732 |
| Country of Origin | USA |
Verified fitment · 59 applications
- Cadillac CTS (2006–2007)
- Chevrolet Camaro (1998–2015)
- Chevrolet Corvette (1997–2013)
- Chevrolet SS (2014–2017)
- Chevrolet SSR (2005–2006)
- Chevrolet Trailblazer (2006–2009)
- Pontiac Firebird (1998–2002)
- Pontiac G8 (2009)
- Pontiac GTO (2004–2006)
| Part No. | 54901U-904 |
|---|---|
| Brand | Edelbrock |
| Part Type | Engine Block |
| Weight | 140 lb |
| UPC | 036584051732 |
| Country of Origin | USA |
Platform-level fitment (Ford + GM, Phase 1). We publish the engine platform a part is built for — not year-and-trim application data — so nothing here confirms a fit on a specific vehicle. Confirm fitment with us before ordering: (714) 202-7886.