Quote:

Bradd Penn



Cept Penn is a semisyn...

I called Total Seal and they told me no syn or semisyn for at least 800 miles..so

Plenty of race motors come out of the box with Penn.

I was talking to a local machinist the other day he uses Mobil full syn on the skirts, rings when putting motors together..

So, flip, IDK. Id still play it safe and go with a full dino oil...

72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72. Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.