The 2005 and 2006 models packed a 6.0L LS2 V8 engine with tons of grunt. In the horsepower department, the Pontiac GTO 6.0 engine doesn't disappoint: it clocks in at 400 horsepower, with 400 lb-ft ...

In the late 1960s, few GM divisions were as daring as Pontiac ... this engine was not only for cruising. It also found its way into high-performance models such as the Firebird and GTO.

Debuting in 2004, the GTO by Pontiac was an all-new performance automobile that had gained popularity in Australia prior to being released in the U.S. In 2005, a faster 6.0-liter LS2 V8 engine was ...

However, that didn’t stop the Pontiac GTO from seeing the ... 1970 would bring peak horsepower to the GTO, with the 400 cubic-inch Ram Air IV engine producing 370 horsepower.