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 computeraided design and extra surface material to allow custom machining, you get the new benchmark for LS horsepower, torque and durability.
| BLOCK SPECIFICATIONS |
4.125”-4.165” siamese cast bore walls w/ press-in spun cast iron liner
Available in standard (9.240”) & tall (9.750”) deck heights w/ beefy .750” deck thickness
Both standard deck (5.67”/5.87”- same as LS7) & tall deck (5.94”/6.38”) cylinder liner lengths available
“Long arm friendly” – Accommodations for up to 4.6” stroke w/ standard rod pin diameters (2.100”) & oversized 60mm camshaft
Raised cam centerline (.388”/9.86mm) to allow larger stroke; 2 extra links in the timing chain – Timing sets available from COMP®
Main cap surface area maximized at mating surface & large fillets from cap to cross bolts for added strength
Designed for clearance – side oil galley moved outboard & engineered rod clearance come standard
Significantly increased windage passage area under bores & around caps over LS7/LSX engines
6 head bolt design w/ full water jacket around the cylinders (based on LS7 design)
Bay-to-bay breathing improved w/ increased side window area versus LSX & LS7
Extra large windows in valley for access to inboard “6th” head bolt
Extra long liners for standard (5.87”) & tall (6.38”) decks
| VALVE TRAIN CAPABILITIES |
Provisions for Gen III & Gen IV cam & knock sensors & valley covers
Cam tunnel will accommodate stock through oversized 60mm roller bearing cams (includes cast-in lock screw pads)
.842” lifters standard with material available for oversized lifter access (accepts 1.060” bushing for keyed lifters)
In the standard deck, maximum pushrod angularity = Less than 2 degrees
Includes Ampco 45 cam thrust plate and aluminum rear cover
Lifter bosses designed to clear tie bar lifter
| SUPERIOR OILING |
Priority main oiling, galley moved outboard for long stroke clearance
Oil filter feed galley GM “dog bone” replaced with proprietary no restriction threaded plugs
Dry sump friendly with provisions for more serious dry sump setups; includes big front & rear AN-12 side feeds
Includes provision for piston oil squirters, cast-in & machined
| ADDITIONAL 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
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If you are not 100% satisfied with your purchase, you can either return your order for a refund or exchange it for something else, for up to 60 days from the delivery/pickup date. Following are the specific time periods of our return and exchange policy:
Drop Ship Items and Garage Sale Items are not eligible for return.
*Open-box electrical & special-order/custom-order components are not eligible for returns along with drop ship and garage sale items as stated above.*
Order Cancellations: Special order items are subject to order cancellation fees (2-5%). This includes engines, short blocks, and any items that require machine work.
Refunds (if applicable)
Once your return arrives at our warehouse, please allow 3-5 business days for proper inspection, processing, and refunds to be issued. Please note; we will release your funds as soon as the return process is completed, but your financial institution can hold funds for 1-5 business days after we release them.
Late or missing refunds (if applicable)
If you haven’t received a refund yet, first check your bank account again.
Then contact your credit card company, it may take some time before your refund is officially posted.
Next contact your bank. There is often some processing time before a refund is posted.
If you’ve done all of this and you still have not received your refund yet, please contact us at amsracing@gmail.com.
Sale items (if applicable)
Only regular priced items may be refunded, unfortunately sale items cannot be refunded.
Exchanges (if applicable)
We only replace items if they are defective or damaged. If you need to exchange it for the same item, call us at 318-222-7889 and send your item to: AMS Racing, 1020 Barksdale Blvd., Bossier City LA 71111, United States.
Warranty
AMS Racing is not responsible for any labor charges associated with a defect, a failure or improperly installed component. The installer will be liable to inspect and review all components before the installation process. If a defect is found, we will work with the manufacturer directly to have it replaced.
Gifts
If the item was marked as a gift when purchased and shipped directly to you, you’ll receive a gift credit for the value of your return. Once the returned item is received, a gift certificate will be mailed to you.
If the item wasn’t marked as a gift when purchased, or the gift giver had the order shipped to themselves to give to you later, we will send a refund to the gift giver and he will find out about your return.
Shipping
To return your product, you should mail your product to: AMS Racing, 1020 Barksdale Blvd., Bossier City LA 71111, United States
You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.
Depending on where you live, the time it may take for your exchanged product to reach you, may vary.
If you are shipping an item over $75, you should consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.
Free Shipping on Qualified Orders
Within the Continental US
Excludes Freight Shipments ie. Engines
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