Update: The roadster has gone 5.98 @ 114 in the 1/8 and 9.63 @ 134 since replacing the heads.

I have to admin I'm pretty happy getting a 5.98 from a TRW piston 383 with a torker intake and 750 E85 carb. The car is just plain nasty with this combination. I couldnt be happier with these heads.

33 Plymouth Roadster - 383 - 5.90 1/8th 9.58 1/4
68 Dart - 340
66 Belvedere - 400

Windy Hollow Garage - https://www.youtube.com/@windyhollowgarage