LS Classic Series Tri-Power Look Engine LS3 495 HP Unpainted with Cast Big Block Valve Covers

Engines are built to order.

Please allow 2-3 weeks for build time.



If you don't know what you need, call our technical sales staff at 931-646-4836


LS Classic Series Classic Crate Engines

LS Classic Series classic crate engines come with the complete line of LS Classic Series components pre-installed and ready to drop-in your classic ride. These crate engines start with a brand new, GM 495 6.2L horsepower “Hot Cam” LS3 right out of the box. Tri-Power look with twin EFI throttle bodies. Complete with chrome tri-power air cleaner, unpainted block and cast BB valve covers. Once completely assembled, the Holley ECU is loaded with a start-up tune, and the engines are run to check for leaks and oil pressure. 

Specifications include:

* Compression ratio of 10.7:1

* Recommended fuel is 92 octane
* Cast aluminum block with 6-bolt cross-bolted main caps
* Nodular iron crankshaft
* Powdered metal connecting rods
* Hypereutectic aluminum pistons
* Steel hydraulic roller tappet camshaft
* Valve lift of 0.525 in. for intake and exhaust
* Duration at 0.050 in. is 219 degrees intake and 228 degrees exhaust
* Lobe separation angle is 112 degrees
* Combustion chamber volume is 68cc
* Valve diameter is 2.165 in. for the intake and 1.590 in. for exhaust
* Cast roller trunnion rocker arms with a 1.7:1 ratio
* Internally balanced
* 58x Gen IV reluctor wheel
* Maximum recommended rpm is 6,600
* Recommended torque converter stall is 2,400-2,800

Engines include:

* Fully assembled long block
* Holley Terminator engine management system with O2 sensor and transmission control
* Tri-Power intake system with chrome air cleaner, GM throttle body and injectors
* Oil pump, pick-up and Camaro style oil pan
* Intake manifold, fuel injectors and throttle body
* Harmonic balancer
* Front timing cover
* Billet aluminum valley plate with oil fill tube and breather cap
* Oil filter and passenger side oil dipstick and tube
* High-performance rear dump exhaust manifolds
* 14.000 in. automatic transmission flexplate

American Powertrain can also set up your engine for a manual transmission. Just give us a call!


Weight: 600 lbs

Dimensions: W48" x H48" x L48"

If you don't know what you need, call our technical sales staff at 931-646-4836