My 440 source heads have held up great and run 5.90's in the 1/8ths and 9.60's on my little 383.

They have about 10 years on them with slight cleanup by hand.


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