| Component |
LT1 |
LT4 |
| Block |
Cast iron, short skirt |
Cast iron, short skirt |
| Bore x Stroke (in.) |
4.00 x 3.48 |
4.00 x 3.48 |
| Displacement |
350 cu in, 5733 cc |
350 cu in, 5733 cc |
| Crankshaft |
Cast iron |
Cast iron with undercut and rolled fillets |
| Torsional Damper |
Single mass |
Dual mass |
| Main Bearings |
Center Caps 4-bolt, End caps 2-bolt |
Center Caps 4-bolt, End caps 2-bolt |
| Connecting Rods |
Powdered metal |
Powdered metal |
| Pistons |
Eutectic aluminum/silicon alloy (Mahle 142) |
Eutectic aluminum/silicon alloy (Mahle 142) |
| Cylinder Heads |
Aluminum, 2 valves/cylinder |
Aluminum, 2 valves/cylinder |
| Valve Diameter Intake/Exhaust (in.) |
1.94/1.50 |
2.00/1.55 |
| Rocker Arms |
Conventional |
Roller pivot and tip |
| Valve Springs |
Round Section |
Oval section with higher closing forces |
| Cam Drive |
Link chain, powdered-metal sprockets |
Roller chain, steel sprockets |
| Valve-Open Duration, Intake/Exhaust (in.) |
279/276 |
282/277 |
| Valve Lift, Intake/Exhaust (degrees) |
0.447/0.459 |
0.476/0.479 |
| Valve Overlap (degrees) |
41 |
46 |
| Compression Ratio |
10.4:1 |
10.8:1 |
| Fuel Injection |
Electronic sequential port |
Electronic sequential port |
| Fuel Recommendation |
Premium Unleaded |
Premium Unleaded |
| Ignition |
Electronic, platinum tip spark plugs |
Electronic, platinum tip spark plugs |
| Horsepower (hp @ rpm) |
300 @ 5,000 |
330 @ 5,800 |
| Torque (lb-ft @ rpm) |
340 @ 4,000 |
340 @ 4,500 |
| Redline (rpm) |
5,700 |
6,300 |
| Mass * |
785.3 lbs (356.2 kg) |
1003.5 lbs (455.2 kg) |
