Shimming Hydraulic Head Rb25

[Franko07]

hi everyone, long story short the timing belt on my 25 shot off whilst running and it destroyed no:6 piston and valves. I've since repaired the block so that's all good for now. My question is the replacement head I had was pretty filthy. I've managed to clean the head up quite well but the hydraulic lifters look like its never had an oil change where as the ones in the destroyed head look beautiful.

How do I go about using the good ones as the process for cleaning the crappy ones is quite long and frustrating.

I found this equation in the service manual

T=T1+(C1-C2)

T= shim thickness

T1 = removed shim thickness

C1 = measured valve clearance

C2 = standard valve oem

but I don't know how to apply it.

In my sr20 you shimmed the rockers so they sat dead flat cause the valves where joined by the rocker, but in this head there individual, so are you accounting for valve height difference or cam lobe difference? or both?

[Franko07]

thinking about it is this even applicable in this situation as when I took the cams out the buckets where all touching them? do you only need to shim the head in rb26 and neos for the solid lifters? thanks!

[Ben C34]

The point of hydraulic lifters is no shims.

[Franko07]

that's exactly what I want to hear, so basically as long as I put the intake side buckets on the intake and the exhaust side ones on the exhaust the lifters themselves should take up the slack?

I was wondering why I could only find write ups on neos and 26's

[Ben C34]

Yep.