Reviews for ProMaxx Performance Products CHR640N ProMaxx Performance Cylinder Head with Valvetrain for 91-06 Jeep Wrangler YJ, TJ, TJ Unlimited, Cherokee XJ, Grand Cherokee ZJ & WJ with 4.0L

I had my mechanic use new head bolts as he recommended. HE HAD TO RETAP ALL THE BOLT HOLES $42.50. He said he could not use a chaser they were so bad. A PREMIUM HEAD?

Installed this head and have about 750 miles on it, I noticed no increase in power and it seems to be much noisier than the stock head