Summary: can I use a '72 set of T120 rocker boxes on a '71 and using the '71 head bolts and rocker box bolts?
I have a 1971 OIF T120 with a non OIF head. (or if it has the right head it definitely has the wrong head bolts).
This is what is on it at the moment:
I am not interested in making a perfect 1971 bike - I just want a reasonably reliable rider. (Having the wrong rocker boxes and long head bolts will make it hard to remove the engine and at the moment the head is also currently leaking so I want to get in here to see what is going on)
I am not sure how they got the motor in there with the older head bolts - I am assuming they jacked and tilted the motor while it was in the frame to insert the long head bolts. I am guessing to get the head off I will need to do the same.
I have sourced a set of 1972 rocker boxes (the ones with the larger opening - I figure that will make adjusting valve clearances easier) and also 4 1971 hex headed head bolts (rather than the round headed 1972 ones) and '71 rocker box bolts.
the 72 boxes and a 71 head bolt and rocker bolt:
Once I get the old bolts out, I am hoping I can simply bolt on the 72 rocker boxes with the 71 head and rocker box bolts.
Is there anything special about the 72 rocker boxes that require 72 bolts? Once I get the old bolts out, should this be a straightforward?