
GM LS7 engine
LSX Racing Engine Development
624HP/598T Road Race Package
See Dyno Sheet

See CNC Flow Data

Small Bore and Standard Bore
GM CNC LS3

Custom Camshaft Development |
RLD Performance is an automotive engineering business providing engineering services and parts to the motorsports industry. RLD Performance collaborates with other automotive engineers and industry professionals to promote select product lines and other contract engineering services. The RLD Performance customer base includes professional engine builders, motorsports teams and the hobbyist. RLD Performance specializes in high performance street, off-road and track components. Motorsports racing venues include but are not limited to off road class 1 sand car, trophy truck, SCCA World Challenge, late model circle track and the drag strip.
RLD Performance specializes in the Late Model Hemi and the GM LSX niche Markets. The Late Model Hemi program includes the most highly developed cylinder heads on the market to date with stage 1, 2 and 3 intake manifolds, a custom camshaft line, custom pushrods, a new shaft rocker arm system, custom racing spring kits and custom titanium valves. We build parts that fit and stand up to the abuse of racing demands. Please review the product line description pages for details.
The RLD Performance GEN III and IV LS7, LS3, L92, LS2, LS6, and LS1 racing cylinder heads and components are some of the most highly developed parts in the industry. We offer the finest racing dual spring kits, custom camshaft and titanium replacement valves. With CNC modifications to the factory LS7 head, our full race cylinder head flows 49 CFM more than factory and the exhaust flows 60 CFM more than factory with a very much improved E/I ratio. With CNC modifications the race LS2 and LS6 intake runners flow 57 CFM more than factory and the exhaust runners flow 42 CFM more than the factory part. With full machine shop services, fully adjustable stainless steel roller rocker arm shaft systems are available and can be modified in-house properly for fitment. Refer to our technical data pages in the parts section of the web site for flow comparisons.
RLD Performance is also a supplier for GMPP Performance Parts, AFR, RHS, Manley, Ferrea, Pioneer, Competition Cams, Crower, Callies, Diamond Pistons, Wiseco Pistons, Mahle Motorsports, Fluidamper, PRW, FAST, ZEX, cold air kits, headers Powerhouse Tools and others.
Customers are directed to distributors and sources on our contact us page. If these distributors are out of product, please email or call us for purchase or inventory status. |

Late Model 6.1 and 426 Hemi Development
Street Sledge Hammer or Road Course
Racing & Off-Road Only - Not Smog Legal
565HP/562T - Stock Exhaust
600HP/560T - Large Tube Headers
http://www.youtube.com/watch?v=d2nt08Tbw_Y
426 Hemi Dyno Sheet with stock exhaust

CNC 6.1 Late Model Hemi Cylinder Head
Flow data-Technical Data

Emphasis is on Total System Development
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