Working on the Valve cover, found a mystery wire - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Longhorn Man · 10-04-2005, 02:58 PM

None of these trucks ever came with 2 sending units. Not originally anyways. The only original location for the temp sending unit for a small block 67 - 72 truck is in the passenger side head between #1 and #3 cylinder exhaust ports.
This may be for the vacume advance delay crap that they had as primitive emissions... Not sure since I have very few details, I think that was mounted on the passenger side of the intake with a relay or something on the firewall.

bucket · 10-04-2005, 05:28 PM

[QUOTE=Longhorn Man]The only original location for the temp sending unit for a small block 67 - 72 truck is in the passenger side head between #1 and #3 cylinder exhaust ports.

Or in the intake manifold near the oil fill tube in the case of a 67 327.

70short/step · 10-04-2005, 05:42 PM

Quote:

Originally Posted by Longhorn Man

None of these trucks ever came with 2 sending units. Not originally anyways. The only original location for the temp sending unit for a small block 67 - 72 truck is in the passenger side head between #1 and #3 cylinder exhaust ports.
This may be for the vacume advance delay crap that they had as primitive emissions... Not sure since I have very few details, I think that was mounted on the passenger side of the intake with a relay or something on the firewall.

Isnt #1 and #3 cylinder exhaust ports located on the drivers side of the engine??

10-04-2005, 02:58 PM	#1
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	None of these trucks ever came with 2 sending units. Not originally anyways. The only original location for the temp sending unit for a small block 67 - 72 truck is in the passenger side head between #1 and #3 cylinder exhaust ports. This may be for the vacume advance delay crap that they had as primitive emissions... Not sure since I have very few details, I think that was mounted on the passenger side of the intake with a relay or something on the firewall.

10-04-2005, 05:28 PM	#2
bucket Registered User Join Date: Aug 2001 Location: Shawnee, KS Posts: 923	[QUOTE=Longhorn Man]The only original location for the temp sending unit for a small block 67 - 72 truck is in the passenger side head between #1 and #3 cylinder exhaust ports. Or in the intake manifold near the oil fill tube in the case of a 67 327.



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