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310 engine blocks and relief valves

A

Adam Suess

Member
I have a 1855 with some what odd block. It is a cooler block but has none of the relief valves in it. It's not even drilled for them. It
has a small 1/8" pipe plug with nothing behind it where the main galley relief would be and the block is not even drilled for the filter
or oil cooler bypass relief valves. engine serial # 384243. Casting #'s A221520H The A and H are stamped the numbers are cast. Below that
is 166101A and below that 422. This block came from a 1855 with a oil cooler and appears to have been green from new. Nothing special
about the filter or cooler housing. It runs 70-85 psi oil pressure cold at idle. What do I have? What do I need to do to make this engine
good to use? Thanks
11155123_820810858004678_5390629277618891664_o.jpg
 
None in the pan rail. My other 3 have the 2 by pass valves there one for the oil cooler one for the filter. I have a service bulletin
that talks about locking up the filter bypass valve in the pan rail with a rod. Looks like I may have to buy and plumb in a remote relief
valve.
 
If that engine ran before like that,... 80 psi of oil pressure won't hurt nothing me thinks.
It's bound to drop when hot.
I have a 3-54 detroit in one of my 1955's.
That one reads at start up 75 PSi but at idle it drops quickly to 15 as it warms up.
Running hot full bore it stays steady at 40.
 
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