'55-60 Block Dowel Locations
A PY member asked for help with dimensions of dowel pin locations on the rear of '55-60 blocks, so I took measurements off one of my Harvey Aluminum blocks, which are very accurate copies of a '60 Pontiac block. In fact, it's possible that PMD machined them, after Harvey cast them, using Pontiac mold patterns. I'll attach a sketch of my results.
Note the potential for tolerance-buildup, which could detract from the precision of the results. After sketching the layout, I searched my notes and found that I had instructed the machine shop to do a "skim cut" on the pan rails, so .005" is probably a good guess. I also found that my rear main clearance is a hair over .004", so the "+/- .0015" shown on the sketch for crank location should actually be +/- .002".
Rather than just sending this info to one person, I decided to make it available here, in case someone else might find it useful. Also- if anybody has actual block blueprints, it would be nice to post the blueprint, and delete this empirical stuff.
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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons?
... or has built a record breaking DOHC hemi four cylinder Pontiac?
... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967)
... or has a Pontiac born the same year as Jim Wangers? (1926} 
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