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I think your car takes a non-vented cap.
Yup...should be non-vented. Why are you looking for a vented cap? Eliminating all of the emissions crap?
Joel Adams
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You can get them from most Corvette Suppliers. When I installed my EFI Tank on my 75 I replaced the stock tank with an EFI Tank from Holley. I needed to purchase a filler neck, gasket, rubber seal, and a vented cap and I got mine from Zip Corvette as it looks like the opriginal. Not all of them do. I also purchased a locking vented cap for the just in case you don't trust the area at night.
You can get them from most Corvette Suppliers. When I installed my EFI Tank on my 75 I replaced the stock tank with an EFI Tank from Holley. I needed to purchase a filler neck, gasket, rubber seal, and a vented cap and I got mine from Zip Corvette as it looks like the opriginal. Not all of them do. I also purchased a locking vented cap for the just in case you don't trust the area at night.
Do you have a part# or link to the 75 EFI tank? My search did not turn up any.
https://www.zip-corvette.com/63-74-gas-tank-cap-vented.html?gclid=CjwKCAjwsKqoBhBPEiwALrrqiJIRSOOuPJvsJLygL3AIv_WPB2qSYpf8he_hU34K1tlCEaA4jh6E-xoCzk4QAvD_BwE