dapiper Posted May 11, 2005 Share Posted May 11, 2005 Valves sunk 0.030 to 0.060" so it's R/R seat time. Have some reservations, tho. Don't want to reinvest all that time to unshroud a replacement head, especially since probably can't find a decent one, so thought I wud reincarnate my N42. There are some fine cracks between the valve seats and we are worried that they may be a problem once we try to replace them, since machinist calls for 0.008" intereference fit, which sounds kind of high to me, even for an aluminum head. This much cud cause cracks to open up more. Apparently they got burned with dropped seats. Already using one set of shims on cam towers and 0.140 lash pad on several exh. This head has only had 4 valve jobs, but even tho I told the machinist to tread lightly, he had to remove about 0.020 to chean up pits. And then to add insult to injury proceeded to grind stem tips to equalize, after I told him not to, since lash pads become recessed into retainers and rockers will bounce around and hog out retainer couterbore collar or worse bottom out in retainer. Hard to find machinist who understands OHC geometry. Also MS doesn't have seats in stock. Anyone have a supply for these seats or experience with replacement? Quote Link to comment Share on other sites More sharing options...
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