We've been getting a ton of mail with questions about how and when to modify the Vortec small-block iron heads—so much mail that we decided to condense all the Vortec information into one ...

GM's 706 Vortec heads are the cheapest and most effective heads you can use on your 4.8-liter and 5.3-liter, and even some 6.0-liter LS engine builds. Bold statement? Well, not really. You see ...

It was called the Vortec design and became the most efficient mass-produced small-block Chevy cylinder head ever created. When Chevy enthusiasts discovered the capabilities of the Vortec head ...

all of which were secured with a new 18-bolt head pattern. The engineers also decided to alter the firing order. Older GM big ...

Aluminum heads, stroker kits, camshafts, and intakes are among the bolt-on parts that will step up the Vortec 8100's game. With bolt-together kits available that send power as high as 685 ...

While the Vortec and LS engines have several differences ... which uses an aluminum engine block and cylinder heads. The L33 was known as the "HO" or "high output" variant.

The Vortec 8100 was used in heavy-duty trucks and SUVs, featuring a strong 18-bolt head pattern and upgraded seals for increased reliability. The engine has been known to last over 500,000 miles ...

At launch, the half-ton pickup was available with five powerplants, starting with a 4.3-liter Vortec V6 ... The fuel-injected engine with cast-iron heads is backed up by a column-shifting ...