Check out this engine compression test, leakdown, and bubble tests. Read more only at www.highperformancepontiac.com, the official website for High Performance Pontiac Magazine!

Is your engine underperforming? Our expert shares how a diesel engine compression test could provide the diagnosis.

With the 5.7-liter LS engine test complete, we removed the LS and replaced it with our iron-headed 355ci small-block Chevy.