For Immediate Release

For Technical Product Information Contact:
Smitty Smith
Technical Sales Coordinator
(310) 991-7744

For Editorial and Media Relations Contact:
Jason Snyder
VP, Marketing
(310) 781-2222 ext. 2915

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Edelbrock's New RPM Xtreme™ LS-Series Cylinder Head Offers
CNC Performance with As-cast Value

TORRANCE, CA - Edelbrock's new RPM Xtreme™ cylinder heads for GM Gen-3 and 4 LS-Series engines (Part #61949) offer the best combination of as-cast port design and custom CNC porting technology available. By blending the affordability of as-cast ports with custom CNC porting in the critical areas (combustion chambers, intake entry, exhaust exit and intake/exhaust bowls), Edelbrock engineers are able to improve air flow and overall performance. This proven combination yields a powerful cylinder head at a lower cost than typical fully CNC'd heads.

Dyno testing on a stock 385HP LS6 engine with Edelbrock LS Series heads and a Lingenfelter GT1-1 cam resulted in an impressive 488 hp @ 6500 rpm and 432 ft./lbs. of torque @ 5000 rpm - made with just a head and cam change.

All Edelbrock intake manifolds and cylinder heads are cast and machined in Edelbrock's own California facilities for absolute consistency and quality control.

    Features Include
  • Direct replacement for 1997 and later GM GEN-3 and GEN-4 engines, including 4.8L, 5.3L, 5.7L and 6.0L V8s
  • 5/8" thick deck for extreme durability
  • Heli-coil inserts in all high-torque bosses
  • 214cc intake ports flow 286 cfm @ .600" lift
  • 80cc exhaust ports flow 215 cfm @ .650" lift w/o pipe
  • Stainless steel 2.02" intake and 1.57" exhaust valves
  • Retail Price: $999.00 ea.

    Edelbrock RPM Xtreme LS Series Specifications
  • Combustion Chamber: 65cc, CNC ported
  • Intake Runner Volume: 214cc, CNC profiled
  • Exhaust Runner Volume: 78cc, CNC profiled
  • Intake Valve: 2.02-inch
  • Exhaust Valve: 1.57-inch
  • Deck Thickness: 5/8-inch
  • Valve Spring: Conical progressive rate; .600" lift
  • Valve train: Stock rocker

For more information visit, or call (800) 416-8628


Founded in 1938, Torrance-based Edelbrock, LLC is recognized as one of the nation's premier designers, manufacturers and distributors of performance replacement parts for the automotive and motorcycle after markets. For more information please visit us at

Edelbrock, LLC opened its first green sand foundry in 1990 in order to fully control the quality of the castings. A brand new robotically-controlled permanent mold facility was opened in 2007. The Edelbrock Foundries are ISO 9001 registered, delivering modern production solutions for aluminum casting and Made in the USA quality.

Edelbrock, LLC. .:. 2700 California St. Torrance CA. 90503