The shim kit which came with the rockers would only be used if I milled the heads, did an aggressive valve job, or decked the block. More than 18-20 lb ft will only stretch the bolt beyond its' tensile strength. Using this criterea, there is minimum, i.e.020 preload when I reach the max allowable torque figure. Because of this, we recommend you check the Note: You may find that the lifer preload is different between a cylinder's intake and exhaust or between one side of the engineĪnd the other. Or different thickness head gaskets, and factory tolerances canĪlso affect the lifter preload on stock engines. Modifications that may have been made to the engine which willĬhange the lifter preload, such as a valve job, different camshaft, Pushrods are available inĭifferent lengths, specifically for this purpose. To obtain proper hydraulic lifter preload. The roller and valve stem, you will have to install longer pushrods If you cannot turn the bolt at least 1/4 turn after first contact with Two different thickness shims are provided for each If you can turn the bolt more than one turn to achieve the proper torque, you will have to shim the Should be able to turn the bolt between 1/4 & 1 turn before you Take a minute or two for you to get the correct setting. Plunger in the hydraulic lifter as you torque the bolt, it will probably There is no clearance between the front roller and the valve stemĪnd the pushrod is seated in the rocker arm pushrod seat. To check and adjust the lifter preload, turn the bolt by hand until

Manual transmission recommended.I have used the Crane instruction, 453E, which came with the rockers, Item 6 - the Ford instruction says about the same thing :Ħ. (11) Good torque and power up to 6500 RPM. (10) Good torque and power up to 6200 RPM. (8) Emissions legal with 5-speed manual trans. (7) Hi-Stall torque converter recommended for automatic trans. (4) May require piston modification for piston-to-valve clearance. (2) Also fits 1994-97 351W with factory roller cam when used with mass air EFI. (1) On EFI engines, performance camshafts work only with mass air induction systems. For comparison purposes, add intake and exhaust lobe centers and divide by 2 to calculate 'camshaft centerline' specification for Ford Racing camshafts. This is useful to check the cam with a degree wheel during installation. The duration figures in the shaded area are taken at 0.050' tappet lift.

NOTE: Camshaft intake and exhaust valve events are measured at 0.050' tappet lift.

E303 cam specs with 1.7 rockers