[hugger6933]

Now on the positive side of the spectrum, the heads could have guides bad causing oil to leak past them and enter the combustion chamber that way. A lot less likely but still possible. Now to to the swap you will need of course a set of heads, intake and head gaskets, the valve covers are different as well so you will need a pair of those and a vortec intake as it has a bolt pattern all to itself. You will also need some vortec intake manifold bolts as they are pretty special with a semi ball made under the bolt head, and be very very careful torquing them down it does not take too much to reach the torque spec. The vortec heads flow better than any small block head that had beed built prior to them and will gain you aprox 40 hp on a healthy engine, meaning one that is not in need of being propped up to live a little longer. I have done this on a S-10 I had and it ran really well but the motor was quite stout to begin with. Good luck hope that helped. Jim