Tim Ames 1970 Plymouth Duster 340 4-speed NHRA Drag Racing Dallas Nationals In-Car Camera

TT5.9mag said
Anyone else notice 2 PCV valves and sealed crankcase?

I know guys are doing that but I don’t get it.

At WOT there isn’t any (or very little) manifold vacuum to reduce crankcase pressure.

Edit: I don’t have time to watch it all today but did the interviewer ask him about the headers??