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Greg Reimer 7376 · 09-07-2018, 05:26 PM

Well, curiosity being what it is, I got back out there and checked. No coolant temperature switch hole,no provision for one. I checked the other two pair of cores I have, none there either. I then went into the trailer, opened the hood on my race car, no temperature switch holes or boss for one on them either. Now, heads made in 1968 had them, as the 3917290 and the 3917293 castings, which are '68 only, do have a plug or a water temperature switch opening. Seems that '68 was the year stuff like that started changing.

09-07-2018, 05:26 PM	#26
Greg Reimer 7376 VIP Member Join Date: Nov 2008 Location: Glendora,Calif. Posts: 1,111 Likes: 164 Liked 649 Times in 208 Posts	Re: 302 Chevrolet Engine Build Well, curiosity being what it is, I got back out there and checked. No coolant temperature switch hole,no provision for one. I checked the other two pair of cores I have, none there either. I then went into the trailer, opened the hood on my race car, no temperature switch holes or boss for one on them either. Now, heads made in 1968 had them, as the 3917290 and the 3917293 castings, which are '68 only, do have a plug or a water temperature switch opening. Seems that '68 was the year stuff like that started changing.