I've put them on my 85 Phazer ... You have to do alot of playing around to get them to work , like I had to go down 3 jet sizes from stock , should go down 1 more . About the HP ... ? I don't know , but it did wake up the mid range and I'm getting about 2 more miles per gal . As for is it worth it , I would'nt use them again .... to much playing around ! and now they are both leaking fuel . I hope this helps ya out .
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