I had the same issues, although not as severe. I drilled two small holes in the cap, just inside the rubber seal. Seemed to take care of the issue.


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.