Also, non-Twisted-Wedge-style heads with 2.02-inch intake valves require pistons with deeper valve reliefs for clearance in their pursuit of more power.

You may have heard that a better flowing cylinder head will improve an engine’s power potential. And you may have heard of the terms porting, gas-flowing and a big-valve head, but do you know ...

Interchanging cylinder heads can be a worthwhile method of increasing performance. here's a complete listing of the best heads to use and the different engines ...

If the large-valve heads are used on a small-bore engine, such as the 265 or 283, it may be necessary to slightly notch the cylinder bores for valve clearance. Do not simply bolt up the head and ...

The 139QMB scooter engine is a popular small engine used in many scooters and mopeds. In this detailed video, we break down ...

While most Four-Valve modular owners are familiar with both B and C DOHC heads, few have even heard of the requisite A head that preceded them both. The first DOHC heads designed by Ford featured ...

Ferrari was so proud of its five-valve cylinder heads, it changed a naming convention that ran back over 25 years. For its previous mid-engine two-seaters, the three-digit name was derived from ...

Burning oil smell. Oil leaks can reach the fuel intake, cylinder head, or other hot engine parts, causing a burning oil smell inside the vehicle and excessive smoke from the exhaust when the vehicle ...

Running a cylinder head intended for a large bore size with an unfitting block can lead the valves to crash into the block. So, you can note that LS1 and LS6 engines can run only intake manifold ...

The automaker blamed a combination of rarely occurring factors for the excessive cylinder valve guide and seat wear on the left cylinder head, including fuel quality and the drive cycle.