I believe its 1987 thru 1995. The 1986 and earlier are the same. Actually the intakes will fit but the bolt holes are different (I think they changed the center 2 on each side to a different angle but not 100% sure). So if you can find a 1987 thru 1995 intake you will be good. Actually you could use the earlier intake but the bolt holes will need a little "massaging". From '96 on, all the bolts are straight up and down and there are less of them. I think summit sells a retrofit kit to mount an earlier intake on a 87-95 head. It uses some angled shims and longer bolts. I remember reading this in car-craft.