Pretty hard to tell without the engine running in a car. Even with a light port, you most likely wouldn't be able to tell.
Go ahead and crack it open, get a soft seal kit. If it isn't ported, now's the time!
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1976 Mazda Cosmo RX-5
1976 Mazda Cosmo RX-5
2003 Toyota Tundra TRD
2015 Toyota 4Runner SR5
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