Question on T3 Headlamps For C2 Vs. C3's

[Larry E.]

Getting my 66 Base Engine Coupe ready to get judged this Spring. Have all original T3 Headlamps
in place and working. Have no spares as of now. I do have spares for C3 Corvettes (1968). If I need
to R&R one would a C3-T3 Headlamp physically fit in a C2? I know the markings would be different and
points would be taking off; but want to know about fit only. Anybody?? Thanks>Larry P.S. Can not look at
mine now since it and parts are stored for the Winter.

[Jim L.]

Re: Question on T3 Headlamps For C2 Vs. C3's

In the era in which these cars were manufactured, headlamps were standardized. All round lamps from any 4-lamp system will fit any other car which takes four lamps. You could even install T3 lamps on a F*rd if you wanted to.

[Jerry C.]

Re: Question on T3 Headlamps For C2 Vs. C3's

Yes they will fit.

[Brandon T.]

Re: Question on T3 Headlamps For C2 Vs. C3's

If you want to sell the 68 headlamps let me know.

[Ronald L.]

Re: Question on T3 Headlamps For C2 Vs. C3's

A very long time ago someone posted a chart of what was what by year. That would be good to find and recirculate here.
'

Larry, I know mine are still there, they were actually really good parts for a long as they survived. And while I got spares just in case, both are burried away until the temperatures get about 70 degrees warmer than where they are this week.

[Larry E.]

Re: Question on T3 Headlamps For C2 Vs. C3's

Thanks to all for the info. I will keep my C3-T3's for spares for now until I can find ones
for C2's. >Thanks>>Larry

[Leif A.]

Re: Question on T3 Headlamps For C2 Vs. C3's

A very long time ago someone posted a chart of what was what by year. That would be good to find and recirculate here.
'

Larry, I know mine are still there, they were actually really good parts for a long as they survived. And while I got spares just in case, both are buried away until the temperatures get about 70 degrees warmer than where they are this week.

This...

[Owen L.]

Re: Question on T3 Headlamps For C2 Vs. C3's

Rabbit trail: we call them T-3, however the logo looks more like TT-3 or some such. Does anyone know what the T-3 (TT-3) refers to?

[Terry M.]

Re: Question on T3 Headlamps For C2 Vs. C3's

Rabbit trail: we call them T-3, however the logo looks more like TT-3 or some such. Does anyone know what the T-3 (TT-3) refers to?

T-3 refers to the three nubs on the front that are ground parallel in order for Guide headlight aiming machines to contact them. These headlight aiming machines had a suction cup to attach to the lamp and the ground posts set against a fixture int he machine to align the lamp. I'll see if I can find a picture on line of these machines. It is too cold for me to go to the garage to photograph mine. BTW: the machine has a Kent Moore number and comes in a AC Delco labeled box that looks like a suitcase. That alignment system was used up to 1996 on GM B-Bodies Caprice, Roadmaster and D-Body Cadillac. It may have also been used on C4s of that time, but I will have to defer to the C4 people for that knowledge.


Aiming tool for four lamp systems
T3 aiming tool.JPG

T3 Guide aiming tool.jpg
Alignment style for the single headlamp C1s and other 7-ingh headlamp vehicles

Both photos from eBay

[Dan D.]

Re: Question on T3 Headlamps For C2 Vs. C3's

I thought T3 referred to "Tilted 3 Degrees". Am I wrong?

Dann

[Owen L.]

Re: Question on T3 Headlamps For C2 Vs. C3's

Thank you, Terry. That also explains the inverted triangle of the logo.

[Dan D.]

Re: Question on T3 Headlamps For C2 Vs. C3's

I did not get any responses to my question on "T3" designation, so I did some research on my own.

I found that T3 means "Tilted 3 degrees down and to the right".
.

This info is from a U-Tube video from a Michigan Chapter presentation on April 12, 2014.

Very informative video on T3 lights for all the years.

Dannnnn

[Ronald L.]

[Dan D.]

Re: Question on T3 Headlamps For C2 Vs. C3's

Ron, I did not mean to anger you.

The video was made by David Price (#24263) in the Michigan Chapter. He said 3 down and 3 right.

If you Google on "T3 headlights", it is under YouTube Videos - "Understanding GM T3 Headlight History".

David Price is still an active member of NCRS in Michigan.

I have always understood that this was done to reduce road glare.

Don't forget this dates back to 1956, the rules may have been different then.

It would be good if there can be found some actual documentation to support the actual definition of the phrase, what ever it signifies, but I am not going to fight over it.

Over and Out,

Dannn

[Ronald L.]

Re: Question on T3 Headlamps For C2 Vs. C3's

Dan, Not angered at all, just know a lot about this and as you have said, would be good to get the documentation.