04-29-2002, 06:24 PM
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CC Member
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Join Date: Jun 2001
Location: Washington DC Metro (Virginia),
VA
Cobra Make, Engine: Classic Roadsters, Tweaked 351W, T-5Z, CRII Tech Support Team.
Posts: 1,895
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Valve stem oil seal for TFS street heads
Previous engine builds (lotsa Pontiacs, coupla Olds's, few 289's & 302's), used teflon or teflon insert valve stem oil seals. This was SOP. The rubber seals with the gasket set were trashed. The rubber ones harden after awhile, then the engine starts drawing oil down the valve stem. Not a good idea for a warm street motor.
TFS recomends using the stock type neoprene rubber valve stem seals stating the valves need more oil. Machinist doing heads dutifully removed the teflon seals and put the rubber ones on. Has iron, not bronze guides.
Some of you have more miles on your TFS's than I do. Teflon, or rubber valve stem seals? |
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