Is removing head of 3L a DIY job?

[boatdude100]

1995 mercruiser 3L
Is there a difficult set-up afterwards to get it running?
Like valve adjustments or anything or is it just bolt on and torque
Thank you

 

[alldodge]

Not difficult, have to adjust valves to zero lash, then turn another 3/4 turn.
The hardest part for some is getting it to zero lash.

Valve is full closed
With 2 fingers on one hand, rotate the push rod slightly back n forth while also going up and down. The up and down is what your wanting to feel, the back n forth is to keep the rod from sticking. With the other hand tighten the rocker nut slowly until the up/down is gone, this is zero lash

The back n forth movement will still be felt