Bill this sucks and its the kind of luck I usually have, 15k on my Race car motor and I got 5 passes out of it . I knew it was a grenade when I built it though. Go see Dave W, he is a good ole boy and stands behind his work. He tells you what you need and thats it, he does the whole job and thats why he stands behind it. If I where going with Blowers or some trick combo he would be the one I chose. But these stock 4.3 liters i don't need anyone special.