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Joe, the cores I had in the shop measured from 3
3/8" to 3 5/8" in thickness otherwise the dimensions were the same.
Dave, the tanks of the core I cut open has a center
hole running down from top to bottom through the cross tube/plates and two
smaller holes on each side of the center hole. There was no tube just the
hole.
Center hole diam 0.865", side holes diam were
.435".
Total width of tank from front of core to back
was 3.25" slightly smaller than the core thickness at the outer edges of
the tank.
From core side to outside tank was a max of 1.25"
and a min (where the tank squeezes in) to 1"
The thickness of the bottom plate (where the tubes
were) was 0.125" but it was brazed to a cross plate giving it a total
thickness of .175"
I recommend using a mill or hole saw being
carefully not to descend too far and nick one of the plates where it curves
in. You can use a regular 1" drill but the changes of nicking the side of
the tank increase. It may be so small that you don't notice it until you
have the core underpressure - then it leaks.
Clearly this may not be representative of all GM
cores.
Ed
Ed Anderson
RV-6A N494BW Rotary
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Matthews, NC
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