VM: Say youve got two Corvettes--one with an LSX 454, and the other with an LS9--at the starting line of the quarter-mile. Everything else being equal, which one wins?
JM: Oh, man, how do I answer this one? Its an interesting comparison, and both engines have their advantages. Did I mention that the LS9 has just been released as a crate engine from GM Performance Parts? Back to your question, I think theyll both cross the finish line in under 10 seconds--assuming slicks and all the supporting equipment--and both drivers will have really big grins on their faces.
VM: Are there any more details youd like Vette readers to know about the LSX 454?
JM: Again, I appreciate the time to hang out with the readers of Vette magazine. Were very excited about the launch of the new LSX 454 crate engine. This product will offer the high-performance-Vette fan something truly representative of the best Chevy has to offer. Not only does the LSX 454 offer 620 hp on pump gas and severe-duty LSX components, but it does so with a factory warranty and the peace of mind that only GM testing can offer. This engine not only cranks out big power, but weve seen more than 25 mpg in our engineering test mules that have been running around for the last 12 months. We think weve got something here everyone will want to take a look at.
| LSX 454 Specifications |
| Engine Type | LSX Series Gen-IV small-block V-8 |
| Displacement (cu in/L) | 454/7.4 |
| Bore x Stroke (in/mm) | 4.185 x 4.125/164 x 162 |
| Block | LSX cast iron with six-bolt, cross-bolted main caps |
| Crankshaft | 4340 forged steel |
| Connecting Rods | 4340 forged steel |
| Pistons | Forged aluminum |
| Camshaft Type | Hydraulic roller |
| Valve Lift (in) | 0.635/0.635 |
| Duration (deg @ 0.050 in) | 236/240 |
| Cylinder Heads | LSX 454 rectangular port |
| Chamber Size | 70 cc |
| Valve Size (in) | 2.20/1.61 |
| Compression Ratio | 11:1 |
| Rocker Arms | Investment cast, roller trunnion |
| Rocker Arm Ratio | 1.8:1 |
| Recommended Fuel | 92 octane |
| Reluctor Wheel | 58X |
| Balanced | Internal |