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Auto HomeShopATK EnginesATK High Performance GM 350 Vortec 315 HP Stage 1 Long Block Crate Engine – HP74
ATK High Performance GM 350 Vortec 315 HP Stage 1 Long Block Crate Engine – HP74

ATK High Performance GM 350 Vortec 315 HP Stage 1 Long Block Crate Engine – HP74

$1,342.00

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Description

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.

ATK High Performance GM 350 Vortec 315 HP Stage 1 Long Block Crate Engine – HP74

Key Highlights:

  • Dyno-Tested Output: 315 HP / 350 lb-ft Torque

  • Vortec Cylinder Heads: Factory-style heads with improved flow

  • Hydraulic Flat Tappet Camshaft: Mild performance upgrade for street use

  • 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 & Flex plate Not included

What’s Included:

  • Fully assembled long block

  • Vortec cylinder heads (assembled)

  • Installed camshaft, crankshaft, pistons, and connecting rods

  • Oil pan

  • Timing cover

  • Valve covers

Note: Intake manifold, carburetor, distributor, and accessories not included—sold separately.

Why Choose the ATK HP74 Vortec Crate Engine?

  • Perfect for GM Truck Rebuilds – Drop-in ready for 1996–2000 Chevy/GMC trucks with Vortec 5.7L

  • Mild Performance Upgrade – Great power boost while retaining drivability

  • Assembled in the USA – Built to exacting standards with top-tier parts

  • 2-Year Warranty – Confidence in every mile

Ideal Applications:

  • Chevy Silverado & GMC Sierra (1996–2000 5.7L Vortec)

  • Tahoe, Suburban, Yukon, and Express Van

  • Classic restomods using Vortec heads

  • 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.