The performance figures and specifications listed below were compiled by Forum Member, Stan Adelman of Auto Performance Test Lab located in Atlanta, Georgia. The Corvette Action Center would like to thank Stan for allowing us to post his Performance Review Data here.
Regarding the stock LT4 horsepower numbers, Stan explains:
The LT4 really can vary in Horsepower and torque. Like I said, the average one on the street comes in between 350hp to 360hp. We have tested over 125 LT4 units since 1996 and found that less than 25% of the units come in under 345hp. About 15% come in between 360hp and 375hp. About 10% range between 375hp and 385hp. 2% have been found to hit the very low 390hp range. This is all stock from Bowling Green. Keep in mind that the torque also increases too. One unit came in on the dyno at 392hp/426lbs-ft torque @5850rpm. Very rare but still present out there. This is why there have been reports of LT4s running with or past ZR1-LT5 cars over the years. Basically, the LT4 will out run the LS1 in 75% of all cases.
| Performance Review Data | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Year | Model | Specifications | 0 - 60 mph | 60 - 100 mph | 0 - 100 mph | |||||||
| 1996 | Coupe | LT1 - 300 hp - 6spd. - 3.45 rear | 5.1 sec. | 6.8 sec. | 11.6 sec. | |||||||
| 1996 | Coupe | LT4 - 330 hp - 6spd. - 3.45 | 4.8 sec. | 6.2 sec. | 10.7 sec. | |||||||
| 1996 | Coupe | LT4 - 365 hp - 6spd. - 3.45 rear | 4.6 sec. | 5.7 sec. | 10.0 sec. | |||||||
| 1996 | Coupe | LT4 - 385 hp - 6spd. - 3.45 | 4.5 sec. | 5.5 sec. | 9.8 sec. | |||||||
The above are the base numbers of the tested LT1/LT4. The following performance numbers were derived from modifications installed:
| Year | Model | Stock HP | Modifications | Modified HP | 0 - 60 mph | 60 - 100 mph | 0 - 100 mph |
|---|---|---|---|---|---|---|---|
| 1996 | LT4 Coupe | 330 hp | Stock with "Hot" cam | 362 hp | 4.5 sec. | 5.7 sec. | 10.1 sec. |
| 1996 | LT4 Coupe | 360 hp | Stock with "Hot" cam | 390 hp | 4.4 sec. | 5.5 sec. | 9.7 sec. |
| 1996 | LT4 Coupe | 384 hp | Stock with "Hot" cam | 412 hp | 4.3 sec. | 5.4 sec. | 9.5 sec. |
| 1996 | LT4 Coupe | 360 hp | Stock with "Hot" cam Free-Flow Exhaust |
405 hp | 4.4 sec. | 5.3 sec. | 9.5 sec. |
| 1996 | LT4 Coupe | 360 hp | Stock with "Hot" cam Free-Flow Exhaust Re-programmed ECM 3.91 axle ratio |
405 hp | 4.2 sec. | 5.1 sec. | 9.1 sec. |
| 1996 | LT4 Coupe | 384 hp | Stock with "Hot" cam Free-Flow Exhaust Re-programmed ECM Shorty Headers 52mm throttle body 315/35ZR-17 tires (rear) Ported Intake System Short Shifter 4.10 axle ratio |
455 hp | 4.1 sec. | 4.9 sec. | 8.9 sec. |
| 1996 Grand Sport Performance Review | |||
|---|---|---|---|
| Magazine | GM Spec. | CD | RT |
| Pub. Date | Jan. 1996 | Feb. 1996 | |
| 0-30 mph (sec) | NA | 2.1 | 2.2 |
| 0-40 mph (sec) | NA | 2.9 | 3.0 |
| 0-50 mph (sec) | NA | 4.0 | 4.0 |
| 0-60 mph (sec) | NA | 5.1 | 5.2 |
| 0-70 mph (sec) | NA | 6.5 | 6.6 |
| 0-80 mph (sec) | NA | 8.3 | 8.3 |
| 0-90 mph (sec) | NA | 10.3 | 10.2 |
| 0-100 mph (sec) | NA | 12.7 | 12.4 |
| 0-110 mph (sec) | NA | 15.7 | NA |
| 0-120 mph (sec) | NA | 19.2 | NA |
| 0-130 mph (sec) | NA | 23.7 | NA |
| 0-140 mph (sec) | NA | 32.3 | NA |
| 0-150 mph (sec) | NA | 46.0 | NA |
| 1/4 Mile (sec/mph) | NA | 13.7 @ 104 mph | 13.7 @ 105.1 mph |
| Top Speed | NA | 168 mph | 165 mph (est.) |
| Braking (ft.) | NA | 164 (70 - 0 mph) | 121 (60 - 0 mph) 218 (80 - 0 mph) |
| Lateral Accel. | NA | 0.89 G | 0.88 G |
| CD: Car and Driver RT: Road and Track | |||