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| CYLINDER HEADS - Chevrolet - LS1 |
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RPM Xtreme LS Series Head
Our new RPM Xtreme cylinder heads give you the best combination of as-cast port design and custom CNC technology. Through dedicated engineering and rigorous testing, Edelbrock engineers have designed a new line of cylinder heads called RPM Xtreme. These heads blend the affordability of as-cast ports with custom CNC porting in the critical areas (combustion chambers, intake entry, exhaust exit and intake/exhaust bowls) for improved air flow and overall performance. This proven combination provides you with a powerful cylinder head at a lower cost than a typical fully CNC’d head.
- Direct replacement for 1997 and later GEN III and GEN IV engines, including 4.8L, 5.3L, 5.7L and 6.0L V8s
- Tested on a Z06 Corvette LS1 engine, these heads made 488 hp @ 6500 rpm and 432 ft./lbs. of torque @ 5000 rpm with just a head and cam change— no re-programming!
- 5/8" thick deck can be machined for additional compression if desired
- 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
- Performance gains comparable to competitors’ fully CNC’d heads, giving you performance at an affordable price!
- 50 State Street Legal: Executive Order number D-215-70 for #61949
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| PERFORMER RPM LS SEMI-CNC HEADS FOR GEN III/IV ENGINES |
| Chamber Size |
Intake Port Size |
Valve Sizes (in/ex) |
Bare (single) |
Complete (single) |
| 65cc |
214cc |
2.02"/1.57" |
N/A |
#61949* |
| Chevrolet Gen III ROCKER STUD BOLT KIT |
#8597 |
| Valley Cover, GM, LS-1/LS-6 |
#7788 |
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AMC
Small Block
