73 454 heads
#1
73 454 heads
I have a 73 big block mostly orginal, the engine and trans were rebuilt in 1994 by previous owner. The block is orginial. The drivers side head has the proper one wire temp sensor, but the passenger side has a temp sensor that is two wire, not hooked up to anything. Any ideas where this may have been previously used. Have not had valve covers off.
Mitch
Mitch
#4
Just a thought,.....
The double wire sensor may be for actuating an electric fan system, replacing the belt driven engine fan. A lot of newer systems use the electric fans. You may have later modle heads.
The double wire sensor may be for actuating an electric fan system, replacing the belt driven engine fan. A lot of newer systems use the electric fans. You may have later modle heads.
#6
Transmission Controled Spark System
If it's disconnected then don't worry about it, if your curious about how GM designed it then look here:
http://www.73spot.com/index_stats_fi...ission/tcs.htm
http://www.73spot.com/index_stats_fi...ission/tcs.htm
#8
I bought mine new from the factory and it doesn't have the thermal switch on psgr side head.
When I installed factory A/C, I had the idle stop solenoid activate when the compressor was on to maintain the idle speed w/ the additional load. Also have vacuum advance connected to manifold vacuum. I think that was originally allowed only in 4th gear but it's been a long time ago. This is on a 4-spd L-82 coupe.
When I installed factory A/C, I had the idle stop solenoid activate when the compressor was on to maintain the idle speed w/ the additional load. Also have vacuum advance connected to manifold vacuum. I think that was originally allowed only in 4th gear but it's been a long time ago. This is on a 4-spd L-82 coupe.
#9
Transmission Controlled Spark System
That's interesting. I just looked in the 74SM (Section 6-T) and it shows the switch in the right head. What do you have in there?
Regards,
Pete.
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