There was a 3 part set of articles beginning in
Sept of 1998 in Hot Rod magazine called
'Magnum Manifesto'
that has a lot of tech info on the 360 Magnum.
Jim Szilagyi's 2004 book
"How to Build Big-Inch Mopar Small Blocks"
is perhaps the best of the books on this engine.
http://www.amazon.com/Build-Big-Inch-Mop...2151&sr=8-1and is certainly worth the $17
the piston drawings and weights listed in all years of the Ram FSM are incorrect,
and apply to the pre-Magnum piston,
but the iron V10 has the same piston and that section of the FSM has correct numbers.
Compression height is nominally 1.622
but I measured an average of 1.626 inches.
Dish volume is nominally 11.3 cc, but Larry Shepard refers to it as 10 cc
Szilagyi's book has the correct numbers for the stock piston, plus much more for aftermarket pistons.
Combustion chamber volume is nominally 60 cc, and Larry Shepard writes that officially it should not be below 57.2 cc,
but many Magnum chambers have been measured by owners as around 62 cc,
so the range might be a sloppy 57 to 63 cc
the rocker arms are listed as 1.60 ratio nominal,
but nearly always measure higher in the 1.65 to 1.68 range
there is a lot of conflicting info on stock camshaft lift and advertised duration specs for various years
the stock Magnum valve springs have limited ability to handle higher lifts
the stock stamped steel impeller in the 360/5.9 water pump has had problems with 'cavitation corrosion' if the right anti-freeze was not used... it can look like it was 'eaten by termites'
the stock thermostat is a standard grade Robertshaw-Siebe with a steel body and brass arms which are prone to cracking after a few years
The 'belly pan' gasket below the stock intake manifold is prone to blow out near the back, perhaps caused by bolt holes that were not tapped full depth, and made worse by the plate being steel and the rest of the manifold aluminum.
1992-1993 cast iron exhaust manifolds are slightly larger internally than later years
