Re-Torquing SCJ Aluminum Heads on the Ford Racing Crate engines

[blykins]

Ah, when you said lash, a solid cam popped into my head....

Same rules on what order you set them.

With a hydraulic cam, then just take up all the slack in the pushrod (doesn't necessarily mean that it will have drag on it or will barely turn, it just means that there is zero lash), then give her about a half turn and lock it down.

I don't use a torque wrench on the rockers, just adjust the preload, then put the smack down on the set screw with a T-handle.

If you wanted to get technical, your lifter manufacturer will have a "preload spec"...say .015-.020". If you measure each thread on your rocker stud, you will see how much a half turn, 3/4 turn, or full turn will preload the lifters. Then you can adjust accordingly.

However, unless it's a short travel lifter or I'm trying to set it at the very top of the travel, then I go about 1/2 turn past zero lash.

[kitcarbp]

Ok that helps me.

The adjustment method I see referenced by other builders is the one you mentioned (Adjust Intake when exhast begins to OPEN, Adjust Exhaust when intake is Almost closed, folks use EOIC a reminder).


But why not use the sequence of the firing order and adjust each cylinder when its firing @ TDC by starting at :

# 1, (adjust both I/E) then turn crank 90 deg,
#5, (adjust both I/E) then turn crank 90 deg
#4 etc. etc.

What are pros and cons ?

Does it depend on how much the cam is advanced in a given engine since 90 deg at crank may not put you exactly on cam lobe's base circle of a given cylinder ?

Does it comes down to being able to judge when the lifter is on the base circle of the cam ???
Thanks again