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Blazer1970 · 02-11-2003, 02:37 PM

I am not sure about BB heads, but on small blocks the old heads had 1/2 NPT taps for the senders, and on the new stuff (Vortec heads for sure), it is 3/8 NPT. I think they changed to 3/8 long before the Vortec engines, but I am not sure what year.

02-11-2003, 02:37 PM	#3
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,507	I am not sure about BB heads, but on small blocks the old heads had 1/2 NPT taps for the senders, and on the new stuff (Vortec heads for sure), it is 3/8 NPT. I think they changed to 3/8 long before the Vortec engines, but I am not sure what year. __________________ Tim