07-13-2006, 04:48 AM
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CC Member
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Join Date: Feb 2006
Location: Gore. New Zealand.,
SI
Cobra Make, Engine: DIY Coupe, F/T ,MkIV.
Posts: 808
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Not Ranked
We had problems years ago in NZ when the fuel companys were using 'toulene' to help boost fuel quality. Side effect that did not become obvious for some time was a carbon type residue that seemed to get into the port end of the bronze guide [literally into the pore's of the bronze ] and cause it to shrink on the valve stem.
Other than that , perhaps your valve stem seals are to efficient or perhaps you need a bit more oil up top, if you are using restrictors etc. I use stand pipes to raise the oil level up to the first coil of the valve spring when running if PC type seals are fitted to Intake & Exhaust.
Jac Mac
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