ATK High Performance GM 350 Vortec 315 HP Stage 1 Long Block Crate Engine – HP74
Bring classic small-block power back to life with the ATK HP74 GM 350 Vortec Stage 1 crate engine. Designed as a direct-fit long block replacement for 1996–2000 GM trucks, SUVs, and performance applications using Vortec heads, this engine delivers a solid 315 horsepower and 350 lb-ft of torque—perfect for stock upgrades, mild performance builds, and daily driving reliability.
Every engine is assembled with precision using quality name-brand components, backed by ATK’s 2-year/unlimited mileage warranty, and built in the USA.
Key Highlights:
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Dyno-Tested Output: 315 HP / 350 lb-ft Torque
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Vortec Cylinder Heads: Factory-style heads with improved flow
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Hydraulic Flat Tappet Camshaft: Mild performance upgrade for street use
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Drop-In Ready: Perfect match for 1996–2000 GM vehicles using Vortec-style intake and accessories
Technical Specifications:
| Specification | Details |
|---|---|
| Displacement | 5.7L / 350 C.I.D. |
| Engine Block | Seasoned GM Vortec block |
| Cylinder Heads | GM Vortec Iron Heads |
| Compression Ratio | 9.4:1 |
| Camshaft Type | Hydraulic Flat Tappet |
| Camshaft Specs | ~0.420”/0.443” Lift, 194°/202° @ .050 Duration |
| Horsepower | 315 HP |
| Torque | 350 lb-ft |
| Assembly Type | Long Block (no intake/carb/distributor) |
| Rear Main Seal | 1-piece |
| Balancer & Flexplate | Not included |
What’s Included:
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Fully assembled long block
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Vortec cylinder heads (assembled)
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Installed camshaft, crankshaft, pistons, and connecting rods
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Oil pan
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Timing cover
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Valve covers
Note: Intake manifold, carburetor, distributor, and accessories not included—sold separately.
Why Choose the ATK HP74 Vortec Crate Engine?
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Perfect for GM Truck Rebuilds – Drop-in ready for 1996–2000 Chevy/GMC trucks with Vortec 5.7L
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Mild Performance Upgrade – Great power boost while retaining drivability
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Assembled in the USA – Built to exacting standards with top-tier parts
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2-Year Warranty – Confidence in every mile
Ideal Applications:
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Chevy Silverado & GMC Sierra (1996–2000 5.7L Vortec)
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Tahoe, Suburban, Yukon, and Express Van
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Classic restomods using Vortec heads
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Custom swaps and light performance builds
Looking for a Turnkey Option?
Pair the HP74 long block with a carbureted or EFI intake, ignition system, and fuel delivery kit to build a complete powerplant. We also carry ATK’s full lineup of Stage 2 and Stage 3 performance crate engines for those seeking even more horsepower.
