Yeah it seems to seal up well. Car runs great. Had a couple runs this summer at it 95.75 in the 1/8 and 118.6 in the 1/4 full steel 72 Duster with 727/Hughes 3500/4.10/28. 408 800cfm DP, Strip Dom, Trickflow, Howard 254/260 600/615 Solid 11.2Cr. I would like some more carb but it was a 650...