67 Head Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

hobsiscool · 01-13-2010, 10:06 PM

In this picture, what is this little plug on the head that the arrow is pointing to? I just got me a 67 head to go on my 81 and I don't know what it's for...I got the plug that came off of it but don't know what it goes to lol...any help?

hobsiscool · 01-13-2010, 10:24 PM

Anyone?

463 · 01-13-2010, 10:33 PM

it should be the electric water temp sender to a electric temp gauge

hobsiscool · 01-13-2010, 10:37 PM

Got ya...I was wondering why some folks had it hooked up and some didn't...guess I could replace that plug with a different probe...mechanical temp gauge perhaps?

**edit...guess I could just get another electrical water gauge huh...I see Autometer has a whole range of gauges...

463 · 01-13-2010, 10:47 PM

the hole should be 1/2 in.-14 Thd or 3/8 in.-18 Thd. most parts stores have the brass thread adaptors or there in the manual temp gauge packages.

70c/10barebone · 01-14-2010, 12:04 AM

I don't believe that's for your temp gauge. It is a temp sender for the trans control spark system. It was an early emission control setup that affected spark advance. I'm no expert on it but I think it would kill vac advance unless the engine was in high gear or on cold starts (hence this sender)

hobsiscool · 01-14-2010, 09:16 AM

So would I need to use it for a 3 speed manual from an 81? I've seen it hooked up and not hooked up on different setups.

70c/10barebone · 01-14-2010, 09:53 AM

I'd just leave it plugged with the sending unit in the picture, or if it is missing find a plug to use. No need to use it on your 81 unless you want another gauge. There should be a gauge temp sender on the water neck under the thermostat.

463 · 01-14-2010, 03:10 PM

Quote:

Originally Posted by 70c/10barebone

I don't believe that's for your temp gauge. It is a temp sender for the trans control spark system. It was an early emission control setup that affected spark advance. I'm no expert on it but I think it would kill vac advance unless the engine was in high gear or on cold starts (hence this sender)

i can't find that sender your speaking of in my part search in the 1981. gm for a while did use a electronic nock detection to retard the timing on the early 80's v8 small block for emissions control. http://www.rockauto.com/catalog/moreinfo.php?pk=40252 but it was not used on the inline 6 cyd. i am still puting my money in the temp sender.

01-13-2010, 10:06 PM	#1
hobsiscool Registered User Join Date: Oct 2008 Location: Birmingham, AL Posts: 123	67 Head Question In this picture, what is this little plug on the head that the arrow is pointing to? I just got me a 67 head to go on my 81 and I don't know what it's for...I got the plug that came off of it but don't know what it goes to lol...any help? Last edited by hobsiscool; 01-13-2010 at 10:07 PM.

01-13-2010, 10:24 PM	#2
hobsiscool Registered User Join Date: Oct 2008 Location: Birmingham, AL Posts: 123	Re: 67 Head Question Anyone?

01-13-2010, 10:33 PM	#3
463 Registered User Join Date: Nov 2007 Location: Sask Canada Posts: 1,666	Re: 67 Head Question it should be the electric water temp sender to a electric temp gauge __________________ Trueman

01-13-2010, 10:37 PM	#4
hobsiscool Registered User Join Date: Oct 2008 Location: Birmingham, AL Posts: 123	Re: 67 Head Question Got ya...I was wondering why some folks had it hooked up and some didn't...guess I could replace that plug with a different probe...mechanical temp gauge perhaps? *edit...guess I could just get another electrical water gauge huh...I see Autometer has a whole range of gauges... Last edited by hobsiscool; 01-13-2010 at 10:41 PM.*

01-13-2010, 10:47 PM	#5
463 Registered User Join Date: Nov 2007 Location: Sask Canada Posts: 1,666	Re: 67 Head Question the hole should be 1/2 in.-14 Thd or 3/8 in.-18 Thd. most parts stores have the brass thread adaptors or there in the manual temp gauge packages. __________________ Trueman

01-14-2010, 12:04 AM	#6
70c/10barebone Junior Member Join Date: Oct 2006 Location: Lawrence, KS Posts: 79	Re: 67 Head Question I don't believe that's for your temp gauge. It is a temp sender for the trans control spark system. It was an early emission control setup that affected spark advance. I'm no expert on it but I think it would kill vac advance unless the engine was in high gear or on cold starts (hence this sender) __________________ 70 C/10 LWB 250

01-14-2010, 09:16 AM	#7
hobsiscool Registered User Join Date: Oct 2008 Location: Birmingham, AL Posts: 123	Re: 67 Head Question So would I need to use it for a 3 speed manual from an 81? I've seen it hooked up and not hooked up on different setups.

01-14-2010, 09:53 AM	#8
70c/10barebone Junior Member Join Date: Oct 2006 Location: Lawrence, KS Posts: 79	Re: 67 Head Question I'd just leave it plugged with the sending unit in the picture, or if it is missing find a plug to use. No need to use it on your 81 unless you want another gauge. There should be a gauge temp sender on the water neck under the thermostat. __________________ 70 C/10 LWB 250



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