Additional Articles
Top End Noise - Valve Ticking

Ticking or valve train noises are generally caused by loose or improperly adjusted valve clearances. Louder ticking noises isolated to one or more valves can indicate beginning or advanced camshaft and rocker arm failure. Read More...
Top End Noise - Rattling

A rattling or grinding noise coming from the mid-center and/or top of the engine most often indicates loose cam chains. The noise is more audible at lower engine RPM, or during deceleration. Read More...
Transmission - Pops out in 2 and /or 5th

Over time the engagement dogs will wear or round-off, so the total engagement contact surface is reduced. Speed shifting and/or not getting it all the way into 2nd accelerates the wear. Read More...
Clutch Slipping

Clutch slippage can be caused by any number of problems. First would be plate wear, where the friction material wears and the total pack thickness of the combined plates does not produce adequate pressure to fully grab under acceleration. Read More...
Knowledge base > Engine > DD-207
Top-End Noise Oiling - Oil Mod
Article # DD-207
 

Adding a properly designed and engineered top-end oil mod system provides many benefits to increase the life of the engine.

The two most common types are the bolt-on filter adapter style and the main galley drill and tap style.

A properly designed system feeds filtered oil to the heads at twice the pressure and with three times the oil volume vs. stock. These systems use the back flow rubber in the filter to prevent feed line drainage
when the engine is not running. Feeding filtered oil to the heads prevents debris from entering the heads and passing through the cam journal areas.

Increased oil flow passing over the components in the heads dissipates heat so the engine runs cooler. Increased oil pressure reduces wear throughout the heads and lengthens maintenance intervals. The transmission is fed by a dedicated oil supply which is known to reduce transmission wear. And most importantly, the cams and rocker arms get the proper amount of oil to help prevent premature wear, pitting, or flaking on the contact surfaces.