These engines all came equipped with roller camshafts & lifters. L. They all use a 27-degree DOHC valvetrain with directly actuated hydraulic bucket lifters. The valvetrain was upgraded to include hydraulic roller lifters, however cam specs remained essentially unchanged. It had a longer-duration camshaft, still with hydraulic lifters. Roller camshaft/lifters were introduced in this engine in 1994. The engine was also updated with a slightly revised camshaft and roller lifters. Finally, these engines were equipped with self-adjusting hydraulic valve lifters. All V8 engines received hydraulic roller lifters and new valve cover/head design. The hydraulic valve lifters made for easy maintenance. To adjust the valve clearance, adjust the shims above the valve lifters. Like the 327, it uses hydraulic valve lifters. It used hydraulic valve lifters, a first for Toyota. Powerglide cars got a version which had hydraulic lifters and full pressure lubrication. Engine design has changed and most engines use roller lifters not flat lifters. It also featured hydraulic valve lifters, a first for a European Ford engine.