Considering new heads.

[OrangeCrush1970]

I think my heads have seen their day and I am considering a swap. My engine is original to the truck and my question is whether or not different heads would de-value the block? I know if I threw on some HO’s it would be a different story, but Im thinking VORTEC. Also, would I be able to burn 87 w/ a set of updated heads, or would this require further mod’s to the fuel system?

If some of you are wandering why I think my heads are worn out, it is b/c they were re-worked in 2000, at the same time the engine was rebuilt, and since had about 45k miles put on them over the last 8 yrs. I am burning oil as well as a bit of coolant. I know these symptoms point to a possible head gasket leak, but I have been using the ol’ Marvelous Miracle oil and what little amount of smoke I had from the pipes as diminished. I have also been replacing my spark plugs about every 6k due to excessive carbon / oil deposit on my # 7 & 6 cylinders. What do you guys think? Take me to school!