Gold Lifetime Member
Join Date: Jan 2005
Location: 2 Dog Town in West Texas
Re: Oil in intake port - need ideas
Pull head and I bet you will find worn guides also,, valve seals will seal the valve stem but oil can still get past the guides under vacumn. Don't knurl also ,, its just a bandaid. All Chevrolet guides will wear out within 30K miles , but will continue to run for another 100k . Its only until the problem gets worse or the motor has a miss that we look at this stuff. Much of this valve guide were is partially caused by the rocker arm tip pushing over the stem during its life,,, side thrust... Good news is that roller tip rockers help stop this . I could go on but thats all you need to know for now... Valve job time and I bet the machine shop will tell you that all the stems are worn.. need new valves.
TC # 349
Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968
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