Excessieve clearance on #5 exh


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By yehaabill - 18 Years Ago
Y-Guys:  I installed an Isky bumpstick 3000 mi ago and  on my way from B'ham to

Knoxville for the F100 deal, The exh valve on # 5 started to "grow". I've bottomed

out the adjustment and it kept getting larger.... My son said I've probably started

loosing a "lobe".  Any ideas before I tear into it ???  ('60 292engine)

                                              Thx Bill

By pcmenten - 18 Years Ago
Your son's probably right; cam lobe wiping out. Have you been using oil or oil additives with ZDDP?
By Town Vicky - 18 Years Ago
Don't get ahead of yourself be sure to check rocker adjuster before pulling anything apart
By PF Arcand - 18 Years Ago
Bill; Lets hope "vicky" is on the right track. If your rocker adjusters are the one piece interference fit type, not the "jamb nut" style, you may well have one that is no longer holding it's set. After multiple adjustments this problem can come up. If it's the problem, you will have to replace the adjuster. Check with Rocker Arm specialties, John Mummert Y-Block or Schumann Sales for new adjusters or a Rocker Arm. Also at one time adjusters were available with oversize threads.