Table of Contents
How much HP does a L31 have?
well, a factory stock L31 is rated at 255hp, the spider injection will fuel a little bit more without too much difficulty….but a marine isn’t factory, the benefit of a marine is the ability to fuel more power correctly.
How much horsepower does a stock 5.7 Vortec have?
5.7 Vortec Transmissions It is rated at 255 horsepower at 4600 rpm and 330 foot-pounds (lb-ft) of torque at 2800 rpm.
What engine is a L31?
1996-2002 GM Truck, SUV, Van applications. L31 LD Vortec 350 ci / 5.7L V8….Important Notes.
| Weight | 438 lbs |
|---|---|
| Brand | GM OE Engine |
| Emissions | Please share VIN and current mileage in order notes for warranty documentation (if applicable) |
| Manufacturer Part Number | 12691673 |
How much horsepower does a stock 350 Vortec have?
Chevy 350 Crate Engines The base version of this engine makes 195 horsepower and features an 8.5 compression ratio.
What is L31?
The Vortec 5700 L31 (VIN code 8th digit “R”) is a 5.7L V8 truck engine. It is Chevrolet’s last production Generation I small-block. The cylinder heads feature combustion chambers and intake ports very similar to those of the LT1 V8, but lacking the LT1’s reverse-flow cooling and higher compression.
What vehicles came with L31 Vortec heads?
Re: Which vehicles came with Vortec heads? ( 96 thru 99 Chevy and GMC pickups, Suburbans, Tahoe, and Blazers. There were two types of Vortec heads, small heads were used on the small V-8 truck engine, the larger L31 heads were used on all 5.7 V-8s.
What are L31 Vortec heads?
The Debut. From 1996 to 2000, GM truck and van 350 engines came equipped with L-31 Vortec cylinder heads. Built of cast iron, these powerhouse heads upped the horsepower of these engines by magnitudes. This is primarily attributed to the high port flow in the .
How do I know if my L31 Vortec heads?
The Vortec heads are a little bit lighter than the older heads and have a “kidney” or “heart” shaped combustion chamber that is more efficient than the double hump chamber. L31 Vortecs comes in two different casting numbers, 10239906 (#906) or 12558062 (#062).
Is the Vortec L-31 a good engine?
Some circles believe the Vortec L-31’s small exhaust port is easier to work than intake, making it an excellent choice for split-duration camshafts. The biggest design shift from prior iron GM heads is the combustion chamber, built in a ‘double-quench’ style.
What was the last year for the Chevy L31 engine?
The 2002 model year was the final year for the L31 5.7 L small block V-8 whose origins date back to 1955. The Vortec 5700 produces 255 hp at 4600 rpm and 330 lb·ft of torque at 2800 rpm. This was the final incarnation of the 1955-vintage small block Chevrolet engine.
What is the Vortec casting number for a L31 head?
Vortec L31 5.7L head ID. The L31 5.7L Vortec casting numbers are 12558062 and 10239906. Casting number 12558062 Vortec head has 3 small humps, aka “sawtooth”, on the end of the head. Casting number 10239906 Vortec head has one large single hump on the end of the head.
What kind of engine does a 5700 L31 have?
The Vortec 5700 L31 (Vin code 8th digit “R”) is a V8 truck engine. Displacement is 5.7 L. It is the last production Generation I small-block. The cylinder heads feature combustion chambers and intake ports very similar to those of the LT1 V8, but without the reverse-flow cooling.