I’ve raced 440 blocks for over 30 years and never had one sonic checked and I have a sonic checker. I don’t want to know what I already know.

1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time