GM's 320-horsepower LC9 engine had its fair share of issues related to oil consumption, but owners are generally positive ...

So that tradeoff is never beneficial. We did a dyno test of a set of iron Vortec heads without pocket porting compared to an aftermarket set of aluminum heads that had been intentionally ported ...

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