Use this automotive relay wiring guide to power lights, fans, horns, and pumps safely, with fuse sizing, terminal maps, and no-nonsense testing tips today.

Learn how to set ignition timing with a timing light, find true TDC, set base advance, and avoid detonation for a stronger-running street or track build.

Cabin air filter replacement clears stale odors, restores HVAC airflow, and helps block dust and pollen. Learn the signs, intervals, and install basics.

The sold-out 37th Annual Nostalgia Day Car Show brings hundreds of classic cars, muscle cars, street rods and custom trucks to downtown Livermore on September 27.

GM's new 6.7-liter LS6 isn't simply a larger version of the old LS. We examine its Gen 6 aluminum block, forged rotating assembly, revised cooling, 13.0:1 compression and new port-plus-direct fuel injection system.

Nissan is preparing a new-generation Skyline for December 2026. The four-door performance sedan could use a roughly 400-hp version of the Nissan Z's twin-turbo V6, while AWD and a six-speed manual remain possibilities.

LED versus HID bulbs: compare brightness, warm-up time, heat, lifespan, fitment, and road legality to choose the right lighting upgrade for your ride easily today.

LS1 main caps are identified by location and direction. Learn what the numbers mean, which way the main-cap arrows point, and how the caps are positioned before seating them in the block.

Before installing the cylinder heads, check the LS1 block deck for warpage. Our LS engine reference specifies maximum flatness of 0.004 inch within 6 inches and 0.008 inch across the deck.

Our OBD2 scanner review explains code readers, live data, bidirectional controls, and fitment so you can buy the right diagnostic tool for your garage.