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Cobra FIA type:
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One of the problems the 289/302 encounters is the comparatively small crankcase has difficulty venting when the engine is in a stroker configuration. A small piece of fuel cell foam stuffed into the vent tube on the valve covers will prevent the
oil spray & vapor from escaping under high rpm. THis works well.
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The GT 350 Type came after the ones with 2 vents on each cover. I'm not sure why they only used 1 vent per cover????
Flash!!! Information was forwarded to me from Cal Metal who was able to have this clarified by Phil Remington. His response was that the ring sealing technology and materials had improved to the point that there was considerably less blowby and consequently only one vent tube per bank was required.