Major Engine Power Upgrades
Component Packages for a 350 Cubic Inch Engine
Upgrade '90-'92 HP '93-'95 HP
Stock engine power 375 405
Low back pressure exhaust system and performance
engine calibration (chip). +25 +15
Sub Total 400 420
Long Tube Headers +20 +20
Sub Total 420 440
Top End Porting +30 +25
Sub Total 450 465
Cylinder Head Porting +35 +20
Sub Total 485 485
Aluminum Flywheel +15 +15
Total HP 500 500
Click on a link below for additional details about the upgrade component
Long Tube Headers Top End Porting Cylinder Head Porting Aluminum Flywheel
Complete Engine Packages
The 500 HP 350
- Full porting, sized for a 350 cubic inch engine
- Long tube headers
- Fidanza aluminum flywheel
- Stock camshafts, smooth idle
- The most performance for your LT5 upgrade dollar $9,799.
368 Cubic Inches, 530 HP
- Four inch liners with JE pistons and Oliver rods
- Full porting, sized for a 368 cubic inch engine
- Long tube headers
- Fidanza aluminum flywheel
- Stock camshafts, smooth idle $15,995.
368 Cubic Inches, 550 HP
- Four inch liners with JE pistons and Oliver rods
- Full porting, sized for a camed 368 cubic inch engine.
- Long tube headers
- Fidanza aluminum flywheel
- Extended duration camshafts, choppy idle. $21,000.
385 Cubic Inches, 565 HP
- Four inch liners with JE pistons and Oliver rods
- Full porting, sized for a 385 cubic inch engine.
- Conservative 3.820” stroke crankshaft maximizes durability
- Long tube headers
- Fidanza aluminum flywheel
- Stock camshafts, smooth idle. $22,120.
415 Cubic Inches, 600 HP
- Four inch liners with JE pistons and Oliver rods
- Forged 4.125” stroke crankshaft. 4340 steel material.
- Maximum porting
- Long tube headers
- Fidanza aluminum flywheel
- Stock camshafts, smooth idle. $22,510.
415 Cubic Inches, 650 HP
- Four inch liners with JE pistons and Oliver rods
- 4.125” stroke crankshaft
- Maximum porting. The plenum port septum is removed.
- Long tube headers
- Fidanza aluminum flywheel
- Extended duration camshafts, choppy idle. $28,250.
All Crankshaft HP Specifications Are Calculated From Measured Dynojet Rear Wheel Power.
The calculation assumes a 15% power loss through the drive-train.
WHP/.85 = CHP
For example: 550 WHP/.85 = 647 CHP