The best thing about the street manners of the LS7 conversion package is that, with the modifications made to the driveline and chassis, this particular GTO puts 505 hp to the ground better than a stock '04 GTO could put down 350 and did so without any of the handling ills that can plague a vehicle tuned for strip use. It still cornered as well as a stocker and didn't nosedive during braking. This chassis was beautifully scienced out.
Once back at GMPP headquarters, I reluctantly handed the keys back to Dr. Meyer. I was really impressed with the GTO project, not only from a performance standpoint, but also from a systems integration perspective. This car acted exactly like a stock GTO in terms of responsiveness, handling and ease of operation; it just had 155 horsepower more. Unlike many one-off project cars I have driven over the last 20 years, the calibrations on this LS7 GTO were spot-on-no stalling hesitation or other unrefined behavior was observed. It felt just like a GTO-only more so.
All of the components to build your own LS7 GTO will be available from GMPP and BMR in the very near future, perhaps even by the time you read this. We were very impressed with GMPP's LS7 GTO and hope that more good packages like it will be coming up very soon.
 No factory VIN tag here; this...  No factory VIN tag here; this one was never meant for retail sale and has no title. |  |  The GMPP LS7 GTO has drawn...  The GMPP LS7 GTO has drawn a crowd wherever it has gone, as evidenced by this interested group of Pontiac hobbyists at the 2006 GTOAA Nats. |
| 7.0 Liter LS7 Specs(Courtesy GM Performance Parts) |
| Horsepower | 505 at 6,300 rpm |
| Torque | 470 at 4,800 rpm |
| (Rating of GMPP crate engine slightly different than Z06 Corvette application) |
| Engine Type | Cam-in-block 90-degree V-8 |
| Displacement (cu in) | 427 (7.0L) |
| Bore x Stroke (in) | 4.125 x 4.00 (104.8 mm x 101.6 mm) |
| Maximum rpm | 7,000 |
| Block Part Number | 17802854 |
| Block Type | Cast aluminum with 6-bolt steel main bearing caps |
| Crankshaft Part Number | 12568819 |
| Crankshaft Type | Forged steel |
| Reluctor wheel | 58X |
| Connecting Rod Part Number | 12586258 |
| Connecting Rods Type | Forged titanium |
| Piston Part Number | 89017774 |
| Pistons Type | Hypereutectic aluminum |
| Camshaft Part Number | 12571251 |
| Camshaft Type | Hydraulic roller |
| Camshaft Duration | 211/230 degrees at 0.050 |
| Camshaft Lift (in) | 0.591/0.591-in |
| Compression Ratio | 11.0:1 |
| Recommended fuel | 91-octane |
| Cylinder Head Part Number | 12578450 |
| Cylinder Head Type | CNC-ported LS7 specific pattern, 70 cc CNC |
| | combustion chambers |
| Rocker Arm Ratio | 1.8:1 (offset intake only) |
| Rocker Arm Type | Investment cast, roller trunnion |
| Valve size (in) | 2.20-inch titanium intake, 1.61-inch sodium filled exhaust |
| Intake Manifold | Composite upper, aluminum base |
| MAF/Throttlebody Size | 90mm |
| Injectors | Bosch 40 lb/hr |
| Headers | Hydroform tube steel, oval quad outlet collectors |
| Ignition | Individual coil pack |
| Oiling System | Dry sump, dual rotor pump (0.95ci pressure, 1.41ci scavenging) |