I’ve had three sets of Stealth heads on my flowbench and they max out around 267 cfm@.700 lift. With very little effort they can easily go 300 plus.

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