Hi Tracy (Crook) and fellow gearheads,
I noticed while at Shady bend that you (and Bruce T.) are using the upper left corner of the oil gallery on your 20b for the engine oil system intake port.  After our conversation Wednesday I have decided to use the same location for my 13b (you mentioned that this was the oil feed location for the turbo on the 20b).  The idea here is to eliminate as many 90º turns in the engine oil galleries as possible by eliminating the passages thru the front cover and the rear housing (3 turns on the front cover and 2/3 turns on the rear housing depending on how the oil filter is plumbed). This mod also makes the oil lines shorter and easier to route.  I plan to run the system as follows:  (all oil system hoses will be -10)
1.  oil pump thru the front housing (not thru the front cover but I will retain the front oil pressure regulator) as discussed on the list a few weeks ago; I will use the Racing Beat 16MM/-10AN adapter like Ian used to transition from the front housing to the -10 oil lines.  I think that 1/4" NPT to 3/8" NPT to -10 could also be used here but I haven't checked to see if the wall thickness of the front cover is large enough for the 1/4" NPT.
2.  Front housing to oil cooler
3.  oil cooler to filter adapter
4.  filter adapter to upper corner of the front housing and back into the engine
5.  flow thru the engine galleries

Note that the 16MM adapter can be used in the upper oil port in order to retain -10AN lines.  I was able to buy a 16MM/1.5 tap locally in Little Rock for $14.xx, so I would anticipate that this tap is available in most any medium size city (LR is about 250,000 population).  Another way to transition to -10AN is to use a 1/4" male NPT nipple / 1/4" female NPT to 3/8" NPT Reducer / 3/8" coupling / 3/8" NPT to -10AN adapter; this lets you get from 1/4" NPT to -10AN which isn't possible with only 1 fitting (or at least I have not been able to find such a fitting!).  I used a catalog from the Chassis Shop to identify these parts but any hydralics shop should have them.

I hope that you find the info on how to transition from 1/4"NPT to -10 helpful.

Ken Powell

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