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This shows all the passages that
were opened up to either gain access for the rearming of passages or installing
threaded pipe plugs to reduce the chance of oil leaks on the front of this
case half.
The reamers sticking out show most of the passages that I opened up the diameter on for improved oil flow from the pump, through the oil filter housing to the oil pressure relief and then to the oil cooler. You will have to study your case for the best understanding of this. |
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This is a bit closer view.
If you were to study a case and track the oil passages from the pump to
the oil cooler, you will find a most convoluted path especially to the
oil cooler bypass valve. Plus the passages run about .380/.400" in diameter.
I used 3 reamers ranging from a .405" to .480" to get up to my final size
of .480". While it doesn't sound like a large size improvement, it is a
bit over 25% gain in cross sectional area! This can add up to quite bit
more flow due to less restriction.
note: in the background on top of #4 spigot hole, you can see the 5th studding addition to the block. Solid weld with a LOT of hand finishing. |
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This is a close up of the size
difference between the modified filter housing and the stock case. When
reaming the case, you have to drill from both ends of the passage between
the oil pump and the housing. this is due to a slight turn in the passage
to align the case passage with the housing passage. There was just a bit
more reaming left to do on the filter housing to remove the slight step
seen at the end of the bottom passage.
Pay some detail attention on matching the pump outlet to case and the oil filter housing to case. If you are using a T1 oil pump, you will have to enlarge and move the passage in the case to align with the pump. Plus you will need to make this a gentle taper in size from the larger pump outlet to the still smaller case passage. |