Is a L31 a roller cam?

In addition to the impressive head flow, the L31 also featured a hydraulic roller cam and a power rating of 255 hp and 330 lb-ft of torque.

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 HP does a 5.7 v8 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.

How much horsepower does a 350 Vortec make?

The 1996-2000 350ci Vortec 5700 engines enjoy lots of aftermarket support to help improve the 255 hp and 330 lb-ft of torque they’re rated for at the crank. An engine swap can be quite costly, so putting even a quarter of those funds into your Vortec 350 engine could get you where you want to be.

How much horsepower does a Thumpr cam add?

The Thumpr made the highest peak torque, the highest average torque, the highest overall average power, the best average numbers between 2,500 and 4,500 rpm, and the best numbers from 4,500 to 6,500 rpm. It made 396 hp at 5,900 and 418 lb-ft at 4,200 with the Vortec heads.

What engine family is the 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.

What Gen is the L31 engine?

first-generation
1996 The 5.7-liter L31 truck engine was the final first-generation small-block V-8 design. It lasted through the 2002 model year powering trucks, vans, SUVs, Isuzus, and the Oscar Mayer Wienermobile.

What engine is a l31?

This engine features precision machine work and final cylinder honing all on computer-controlled machinery. Other features include: 1996-2002 GM Truck, SUV, Van applications. L31 LD Vortec 350 ci / 5.7L V8….Important Notes.

Weight	438 lbs
Manufacturer Part Number	12691673

What is a Chevy L31 engine?

The Chevrolet L31 is a popular option for upgraded 7-liter engines. It features cylinder heads that are compatible with older Chevrolet models. In 1955, the L31 was available for seven years, up until 1969, when it became available again several years later under the 5 year old L31 variant.

What does putting a bigger cam do?

A bigger cam will open the intake valve wider, allowing more fuel and air into the cylinder. The larger the cam, the more fuel that is let in.

How does a Thumpr cam work?

The basic science behind the Thumpr Cams is not a new one. The Thumpr line delivers true high performance engine sound by “tightening” the lobe separation angle of the camshaft. This creates more overlap between exhaust and intake events and more “cool” performance sound.

What cars had the L31 engine?

L31

• 1996–1999 Chevrolet/GMC C/K full-size trucks.
• 1996–1999 Chevrolet Suburban/GMC Suburban full-size long-wheelbase SUVs.
• 1996–2000 Chevrolet Tahoe/GMC Yukon (and 2000 Tahoe Limited and 2000 Tahoe Z71 models) full-size short-wheelbase SUVs.
• 1999–2000 Cadillac Escalade.
• 1996–2002 Chevrolet Express/GMC Savana full-size vans.

What is L31?

Does the L31 have a forged crankshaft?

All the L31 engines feature a nodular iron crankshaft(better than cast iron, not as strong as forged), Powdered Metal(PM)forged connecting rods (stronger than the older Bowtie “pink” rods) hypereutectic aluminum pistons, better than cast, not as strong as forged pistons.

What did L31 heads come on?

Starting in 1996, on several GM Trucks and Vans, the L31 Vortec heads came on the scene. Not just a modification of existing heads, but complete redesign using the 1996 Caprice/Impala SS LT1 cast-iron head castings as a base.

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 .

What kind of engine does a Chevy L31 have?

Chevrolet L31 Engine Specs. Unlike other 5.7-liter V8s that GM manufactures, the L31 features cylinder heads that are compatible with older models, making it a popular upgrade. The L31 was available from 1955 until 1969, but was reintroduced years later and was available until 2002, when the 5.3-liter LM7 engine replaced it.

When did the GM L31 V8 come out?

by Anne Davis. Unlike other 5.7-liter V8s that GM manufactures, the L31 features cylinder heads that are compatible with older models, making it a popular upgrade. The L31 was available from 1955 until 1969, but was reintroduced years later and was available until 2002, when the 5.3-liter LM7 engine replaced it.

What kind of camshaft does Chevy use in LS engines?

Chevrolet Performance precision-engineered Hydraulic Roller Camshafts are extensively tested and available for popular GM small block, big block and LS-series engines. To avoid possible engine damage, a distributor with a melonized steel gear must be used with steel camshafts.

What is the stock compression on a 255 hp L31?

stock compression on the L31 255hp stock and is 9:1 I believe, maybe 9.5:1. THey do have factory roller cams, the cam you listed looks like a regular flat tappet. If you go vortec and do a cam swap stay with a roller.