Valve stem to guide clearance

Take the measurements in three places along the valve stem and three places inside the valve guide. The difference between the largest valve guide measurement and the smallest valve stem measurement should not exceed the service limit. Intake Valve Stem-to-Guide Clearance

Note: Manley Performance strongly recommends that customers check their valve guide size in order to achieve the proper valve stem to guide clearance. Guides may need to be honed when replacing stock factory valves. This is also the recommended valve stem clearance as written in the large Dykes manuals covering the period! A tip when fitting valves is once the valve is lapped in and all is cleaned up. The valve (dry stem)wshould be able to drop under its own weight through the valve guide easiy and hit with a metalic BINK!and possible bounce! their valve guide size in order to achieve the proper valve stem to guide clearance. Guides may need to be honed when replacing valves. Factory sizes may vary depending on the specific motor. Mitsubishi Race Flo Valves Head Stem O / A Tip Underhead Seat Top of All-new, spiral-bound manual features over 800 pages of cylinder head specifications, including: head thickness, installed stem height, valve protrusion or recession, valve head diameter and valve stem to guide clearance. Published in 2017. If a valve replacement is required, the clearance between valve stem and inner guide diameter must not exceed the specified values. If the clearance is too large or the valve guides are worn out-oftrue, conical or flared, they must be replaced. about .003" intake valve stem to guide clearance is about the upper limit i use before replacing a guide. about .0005 more on the exhaust. you can visually see .003 of movement even with oil in the guide arround the valve stem. they wear bellmouthed at the top and bottom. the middle area of the guide will normally be tighter. valve guide to valve stem clearance I am working on a water cooled, 12 HP I.H. Mogul Eng