I do not think they are Vortec heads. All the vortec truck heads I've had started with a 125. The 141 numbers are usually 1980's heads. Count the bolt holes where the intake manifolds bolt to the head. Vortec heads only have 4 holes. Earlier heads have 6. I also checked mortec and did not see that number listed.
yes you guys are right 6 bolts to the intake it has GM 17 on the inside and two straight up lines on the one end of the head they are new style valve covers
