Chevy heads and Edelbrock manifold are pipe threads, if you find a factory installed plug in the head I doubt you will be able to remove it. My original '57 sbc heads have no threaded ports, my sender is in the original cast iron 2 bbl. manifold.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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