When I added egt’s last year I’m pretty sure it said app 1 inch from the header flange at 12oclock. O2 sensors are in the collector in the 3 or 9 o’clock position for moisture reasons.

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