Also, check figure 6 in the Engine section:
http://www.canadianmilitarypattern.com/1960%20235-261%20Engine%20Manual.htmThat is for a 1960 261 engine.
I checked a few more manuals:
1955-2nd 235 - same as the 1948-51 specs
1959 235 - same as the 1960 261 specs
http://chevy.oldcarmanualproject.com/shop/1955truck2/55ctsm0640.htmhttp://chevy.oldcarmanualproject.com/shop/1959trucksup/59ctsms0801.htmlIf I remember when I go to my garage, I'll check 57/58 specs (for those who are interested).
It would be interesting to see if this changed with the higher compression 1956 "848" head?
added after checking Shop Manuals:
- "old" specs up through 1957
- "new" specs 1958 and thereafter