Quote:
Originally Posted by Ronnieroadster
The important part of this conversion is to not reduce the flow by using fittings that are much smaller diameter that the diameter of the main oil passage in the block. The Ford flathead block oil system cross passage is .421 in diameter in every block I have measured. When doing the conversion using 3/8 pipe thread size fittings they can be opened up to the .421 diameter. That's what I always do to any fittings I use when doing this conversion. The way I see it is the safest way to modify the oil system. Good luck.
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I will do what you say, I had a look at my block and I think the horizontal hole below the oil sender will drill out and take a 3/8 thread ok, I will try to get steel fittings