http://4ac-powered.forumotion.com/cylinder-head-valve-train-f9/-t1.htm Read only, if you want to add something or have input on existing information PM the Admin Sun, 26 Apr 2009 03:36:09 GMT 10 http://i87.servimg.com/u/f87/13/77/65/79/4ac_po12.jpg http://4ac-powered.forumotion.com/cylinder-head-valve-train-f9/-t1.htm http://4ac-powered.forumotion.com/cylinder-head-valve-train-f9/camshaft-summary-t24.htm NP75 The 4AC engine has a single over head camshaft that operates on lift amplifying rocker arms that translate the cam motion to the valves. The stock cam specs for most 4AC and 3AC engine: Cam Lift - 5.4mm (0.213”) Cam Base Circle – 34mm (1.339”) Duration at 0.05” (1.27mm) - 204° There is a lesser camshaft for the early model manual trans Tercels, but it sucks so bad I don’t want to think about it. Now the listed lift spec is for the camshaft but the rocker arm ... Cylinder Head & Valve Train Sun, 26 Apr 2009 03:36:09 GMT http://4ac-powered.forumotion.com/cylinder-head-valve-train-f9/camshaft-summary-t24.htm#96 http://4ac-powered.forumotion.com/cylinder-head-valve-train-f9/camshaft-summary-t24.htm