[chevymank15]

i agree with jeddi the only difference in vortec and normal is just the head design thats it and the valve cover might say vortec to make it pretty thats the only difference that i know of so all the parts off your 4.3 will go onto a vortec cuz the all 4.3 blocks are the same to my knowledge so all heads have to have the same bolt pattern to bolt to the block so a normal 4.3 head and a vortec head will bolt to a 4.3

-Red