Product Details

LS Race Bare Engine Block by RHS®. 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. 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.

Fitment notes

Fits Following Engines: 376 CID GM (LS) Small Block Generation V
Fits Following Engines: 325 CID GM (LS) Small Block Generation V
Fits Following Engines: 262 CID GM (LS) Small Block Generation V

Specifications

Material: Aluminum

Features

Rolled threads on all threaded holes for added strength
Gen III/Gen IV compliant with race mounts for Gen I, Gen II, Gen III & Gen IV engines
ARP main stud kit standard with enough material in castings to accommodate up to a ½” fastener
Chilled main bearing bulkheads for added strength
Optimized billet main caps & improved windage

Brand:

RHS

Part Number:

54904 54905 54906 54906U

Warranty

Racing Head Service warrants that all of its products are free from defects in material and workmanship, for a period of one year. The warranty period begins from the date of purchase. RHS recommends that you keep your invoice or receipt because proof of purchase date is required. This limited warranty shall only cover the original purchaser.

The warranty does not include the following:

Any product that has been physically altered, improperly installed, or maintained
Any product used in an improper application, abused or not used in connection with the proper parts
Any product that is defective due to neglect, unauthorized repair, or as the result of an accident

There is no implied warranty of merchantability or fitness for a particular purpose. The RHS obligation under this warranty is limited to the repair or replacement of its products. There are no warranties that extend beyond the description on the face of this warranty. RHS will not be responsible for incidental, consequential, indirect, special or exemplary damages or any third-party claims or property damage or personal damages resulting from use of its products. If there is by law an implied warranty of merchantability and/or fi tness, it is limited to the warranty terms set forth above.

Magnuson-Moss Warranty Act:

Legally, a vehicle manufacturer cannot void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson Moss Warranty Act (15 U.S.C. 2302(C)) Learn More

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RHS® - LS Race Bare Engine Block (GM (LS) Small Block Gen V)