Zip Corvette sales and customer service representatives are here to serve you during the following hours:
Mon-Thur. 8:30am-6pm
Friday: 8:30am-5:30pm
Saturday: 9:00am-1:00pm
(Eastern Standard Time)
Our showroom is open to the public Monday-Friday from 8:30am-5:30pm (EST). We take orders in our showroom or you may call your order in over the phone and we will prepare your items in advance so you do not have to wait.
Our performance and installation facility is open Monday-Friday from 8:30am-5:30pm (EST). Visit our showroom to setup an appointment to have your Corvette tuned, accessorized, enhanced or more. Read more about our performance and installation facility here. *All work requires an appointment.
Other questions? Contact us here 24 hours a day 7 days a week.
New replacement 1975-1978 Corvette intake manifold EFE vacuum fitting - thermal vacuum valve or ported vacuum switch. Temperature sensitive switch threads into intake manifold or thermostat housing and controls vacuum to the EFE valve on the exhaust manifold. Often found broken or cracked due to the plastic housing, loss of vacuum control could cause surging, rough idle or engine knocking. 1/2" - 14 thread - 2 port vacuum valve w/vent. Operating range 175 to 185 degrees.