Editing Valve train points to check (section)
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==Valve train geometry== There needs to be a correct relationship between the components of the valve train to allow the efficient transfer of the cam lobe profile info into linear valve motion. This relationship is often referred to as the valve train geometry. On many OHV engines (like the Chevy V8) the geometry is adjusted by changing the length of the pushrod. A large number of variables are involved in determining the correct length pushrod for your application. Pushrod length is affected by any of the following: *Block deck height *Head deck height *Head stud boss height *Rocker arm brand/design *Cam base circle size *Lifter design/brand/pushrod seat height *Valve stem length *Head gasket thickness {{Note1}} More at '''[[Valve train geometry]]'''. ;Hotrodders forum threads<nowiki>:</nowiki> *[http://www.hotrodders.com/forum/rocker-arm-199353.html Valvetrain geometry] *[http://www.hotrodders.com/forum/mid-lift-rockers-206836.html?highlight=MID+LIFT+MILLER Miller mid lift rocker arm theory] ;Also see<nowiki>:</nowiki> *[http://www.lunatipower.com/Tech/Valvetrain/HowToVerifyValvetrainGeometry.aspx How To Verify Valvetrain Geometry] from Lunati {{Note1}} While opinions vary, many agree a '''narrow''' pattern is more important in many cases than a ''centered'' swept area, as long as the rocker tip is in no danger of riding off the edge of the valve tip. It is strongly suggested the subject of valve train geometry be researched until the builder is satisfied with their decisions. To check for the correct length pushrod for the application, often an adjustable pushrod is used. They can be easily made or purchased from cam manufacturers like Comp. A brief run-down on making your own is [http://www.homemadetools.net/forum/adjustable-push-rod-length-checker-5 '''here'''].
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