Yes it is. 84 GMC one ton truck. It was stock when I got it. I only started the rebuild before I got orders to hawaii. I pooled it apart and it had been horribly over heated until the rocker studs were blue. Both heads were cracked and the cam had 5 lobes gone. It now has a crane truck cam, performer intake and 750 carb runs much better, but it still needs more work when I get back to the states.