[DeTomaso] Rebuilding BOSS heads to hydraulic lifters

[JDeRyke at aol.com]

On original hydraulic lifter heads, the rocker pedestals are 'forked' on top 
and the steel non-adjustable rockers fit a half-moon shaped pivot that indexes 
to the shallow fork in the pedesal. Things are calculated so when a hex-bolt 
thru the rocker pivot is torqued down, the lifter piston is centered....   as 
long as nothing has been changed or not too many valve grinds have been done.

Mechanical lifter heads are built exactly the same except 0.300" is machined 
off each rocker pedestal, which removes the fork. The std rocker pivot no 
longer fits so a stud is installed and a locking adjusting nut is used to set 
valve adjustment. Boss heads were built like this, along with two small 
squish-areas in each combustion chamber that made more power and compression- the 
so-called 'closed-chamber' heads. There were factory open chamber heads (combustion 
area looked like a shallow bowl with no squish areas) built for adjustable 
rockers, too. These were called 'HO' heads. Cheers- J Deryke


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