Quote:
Originally Posted by deuce_roadster
I don't remember what the restrictor hole diameter was but it is less then .060. If the car is driven relatively few mile/year just change the oil each spring before you fire it up for the season. As Kube said, before 1946 they were optional.
If there is no inlet restrictor, I believe it would be difficult to seal the top with the volume entering the filter. If your car is going to be judged, remember any optional equipment can only lose you points.
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You and I are on the same proverbial page. With today's oils and fuels, contamination is not as much of a concern as it was in '46. Keep it clean and the engine will remain "happy".
The restrictor specification was .058" - .063".
I'm not certain what the primary reason was for that restrictor fitting. However, without it in place, the oil pressure will drop significantly.