Quote:
Originally Posted by patrickt
Maybe it's right on the money and your gauge is off a little bit. I wouldn't waste any worries on it though. But just in case anybody ever asks you can tell them that Ford's NASCAR engine blueprinting specs for 1967 called for the relief valve to start opening at 50 to 65 PSI.
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I
don't waste any worries on it because this is the 3rd OP gauge tried in the car and #'s 2 and 3 matched. #1 was very high. Also the idle PSI would not be a near perfect 22. The hot numbers on 5W-30 Mobil 1 (no longer used) were 17 (1000 RPM) and 65 @ 6800.
Forty-two years ago Ford NASCAR motors (which made 510 or 20HP in race trim) ran on straight 50 weight (and most with additives like STP syrup) so it was prudent to bleed pressure before the filter blew off. Now 'Cup motors qualify on something like 0W-5 - quite the reversal.
In the 18 years I've got on this Sideoiler,
no one has ever asked me the pressure relief spring blueprint spec on a '67 NASCAR Sideoiler. I am fortunate to have gleaned this gem of antiquity from so esteemed a source.
