Fantastic Four #158 (Pt 8) Black Bolt, Stoic

Black Bolt and Karnak in Fantastic Four Annual #5 . 

Fantastic Four Annual #5 (1967) Jack Kirby

And here's stoic, statue-like Black Bolt in Fantastic Four #158.

  Fantastic Four #153 (1975) Buckler

Bonus! Also from FF #158: a page later, complete with Karnak. 

Fantastic Four #158, Buckler

Fantastic Four #158 (Pt 7) Karnak the Not-So-Magnificent

1967: Fantastic Four Annual #5  Jack Kirby

1975: Fantastic Four #158  Rich Buckler

Fantastic Four #158 (Pt 6) Inhuman Explosions!

1967: Fantastic Four Annual #5- Kirby      Black Bolt

1975: Fantastic Four #158- Buckler
Gorgon

Fantastic Four #158 (Pt 5) Quicksilver and Crystal

1965: Fantastic Four #37  Jack Kirby

1975: Fantastic Four #158  Rich Buckler

Love it, Pietro has the same chin as Morrat 😄

Fantastic Four #158 (Pt 4) Quicksilver's Awkward Position

1965: Tales of Suspense #62  Jack Kirby

1975: Fantastic Four #158   Rich Buckler