Ok... let me tell you this, I dont recomend the ranger head. You dont need the head to convert to roller follower set up. (I hope you know that) I use the '86 XR4TI head (my SVO is an 84 and the original head wasnt a good performer), I think it gives you the better performace than the stock head ( and is basicly the same as the ford motorsport head) Hope this helps
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