Vortec 8100: Everything You Want to Know

Old truck guys are very familiar with the good ole Chevy big block. The Chevy C20 my father owns has a 454ci big block, and man can that thing pull. If towing is your main concern, then a diesel is probably your best option. But, what if you want a gas truck? That’s where the Vortec 8100 comes in.

Vortec 8100: Engine Basics

The Vortec 8100 is rather obviously an 8.1L V8. It was designed as a diesel alternative in the GM pickup truck line-up. The Vortec 8100 borrowed much of its design from the 454ci big block we all know and love. The main difference between the 8100 and big blocks of old is the increased stroke. This is what increased the displacement to an impressive 8.1 liters.

You might be wondering, why isn’t this massive engine used in a performance application? The Chevy LS is super popular so why isn’t this engine? Well, there are quite a few things holding the Vortec 8100 back from ever becoming popular:

  1. Iron block and heads, total engine weight is over 750 lbs.
  2. Older big block parts don’t fit on the Vortec 8100.
  3. Chevy LS parts don’t fit on the Vortec 8100.
  4. Limited production makes them harder to find than an LS.

Vortec 8100: Applications

Like I mentioned above, the Vortec 8100 was used in GM pickup trucks as a diesel alternative. But, it was also used in a few other applications:

  • Chevy Silverado/Sierra 2500HD & 3500HD
  • Chevy Suburban/Yukon XL 2500
  • Chevy Express 2500 & 3500
  • Chevy Avalanche 2500
  • Chevy Kodiak
  • Workhorse Class A motorhomes
  • T-98 Kombat armored vehicles
  • Malibu Boats
  • MasterCraft Boats

As you can see, the Vortec 8100 was used in a host of different vehicles. Chevrolet offered it in all of their heavy duty applications. The coolest application would have to be the T-98 Kombat armored vehicle.

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Vortec 8100: Performance Data

This part gets a little interesting. If the Vortec 8100 is supposed to be an alternative to the Duramax engine, then it must create lots of torque. Torque at low RPM is one of the single most important factors of a heavy duty engine. So, how does the Vortec 8100 do? For this we’ll look at the performance data for the GM truck applications.

Vortec 8100:
330 horsepower @ 4,200 RPM
450 lb-ft @ 3,200 RPM

LB7 Duramax:
300 horsepower @ 3,100 RPM
520 lb-ft @ 1,800 RPM

I know what you might be thinking. “Why does an 8.1L only make 330 horsepower?” If this was a performance application that would be abysmal, however this is a heavy duty application. It makes an impressive 450 lb-ft way down low in the RPM range. Other versions of the Vortec 8100 make as much as 550 horsepower and 690 lb-ft.

Vortec 8100: Tuning Potential

The Vortec 8100 isn’t super impressive in stock trim, but it’s designed for heavy duty work. Like I said earlier, standard big block parts won’t fit on the Vortec 8100, so the performance parts available for it are close to none. However, this is one company who offers some very interesting Vortec 8100 parts.

Raylar Engineering is pretty much the only company interested in the Vortec 8100. They have developed multiple stroker kits to take it from 496ci to 511ci or all the way to 540ci. They also offer everything from camshafts to blowers. Their stage 3 package 540ci engine will make an insane 685 horsepower and 680 lb-ft of torque. Unfortunately the stock Vortec internals are fairly weak so any heavy modifications will require a forged bottom end.

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So, Raylar Engineering makes a bunch of really cool parts to wake your Vortec 8100 up, but is it worth it? If you’re just towing their towing camshaft and the 511 stroker kit will be a killer combo for you. If you want to go fast their bigger camshaft and 540 stroker will make big power for you.

Summary

So, the Vortec is an excellent heavy duty engine. It nearly matches its diesel brother in torque and beats it in horsepower. But, due to its heavy weight it is rarely swapped into hot rods. It is slowly becoming more popular thanks to companies like Raylar Engineering who can turn it into an absolute monster. Let me know what you think of the Vortec 8100 in the comments below!