1962 Other Jaguar Models misfire, afterfire

Tiny
EDRIVER
  • MEMBER
  • 1962 JAGUAR
  • 6 CYL
  • 2WD
  • MANUAL
  • 100,000 MILES
Is it possible that not enough valve clearance can cause a misfire and afterfire (out exhaust) when engine is run steady at higher rpms? It idles fine and revs easily. A valve job was just done and the valves must have seated some. The cold spec for the 4.2 liter is.004 intake and.006 exhaust and when I just checked them they were about.002 -.0025 on the intake and.003 -.005 on the exhaust. I'm restoring the car and it wasn't running when I got it. Almost everything on the motor has been rebuilt or is new. I've checked and rechecked everything I can think of but it won't run right. What do you think?
Bill
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Saturday, May 17th, 2008 AT 2:24 PM

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Tiny
DAVE H
  • EXPERT
Valve clearence has to be exact
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Sunday, January 17th, 2010 AT 8:23 AM

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