71 LT-1 carb stud

[Robert S.]

Basic question: What are the correct finishes on the carb stud, nut, and washer? This is not specifically addressed in the TIMJG. No luck searching the archives either, but I did see a discussion suggesting that perhaps a separate nut and washer may have not been used for this year. Any further comments on this?

[Edward C.]

Re: 71 LT-1 carb stud

My very origional 71 LT-1 has nut and washer and all including the stud appear to be natural finish. the nut could have been blackened but I don't think so. Ed

[Robert S.]

Re: 71 LT-1 carb stud

Ed, thanks for your reply. I have seen black phosphate and natural finish studs from the usual suppliers. Sounds like your setup is the way to go.

[Terry M.]

Re: 71 LT-1 carb stud

The nut is somewhat unusual in configuration. I lost your post yesterday afternoon when I went to the desktop to post the picture of the stud and nut on my 1970. I hope I can fnd yoru post tonight.

[Dave S.]

Re: 71 LT-1 carb stud

Basic question: What are the correct finishes on the carb stud, nut, and washer? This is not specifically addressed in the TIMJG. No luck searching the archives either, but I did see a discussion suggesting that perhaps a separate nut and washer may have not been used for this year. Any further comments on this?

Robert,
I've attached a couple of carb. photos of my 71 LT-1 5 star car. Of the 4 nuts one has the throttle cable bracket under it and another has the fuel line bracket. The other 2 go directly to the carb. base. None of the 4 have lock washers. Nuts look to be plated with zinc or cad.

[Robert S.]

Re: 71 LT-1 carb stud

Dave, good pics. Looks like a standard nut. The studs seem longer than the ones I was looking to get. Can you estimate the height about the intake manifold?

So, one car with washers, one without.

[Terry M.]

Re: 71 LT-1 carb stud

You all don't want to see my 1970 now. It will just confuse the issue.

[Robert S.]

Re: 71 LT-1 carb stud

Terry, I realize that for 70 that the nut had an integral washer. But do the length of the studs on your car appear to be the same as Dave's?

[Terry M.]

Re: 71 LT-1 carb stud

I'll make some measurements tonight.

[Dave S.]

Re: 71 LT-1 carb stud

Dave, good pics. Looks like a standard nut. The studs seem longer than the ones I was looking to get. Can you estimate the height about the intake manifold?

So, one car with washers, one without.

Robert,
It's a little hard toi get an accurate measure but the nut is about 5/16" high.

[Robert S.]

Re: 71 LT-1 carb stud

Thanks, Dave. It the nut is 5/16" thick, then from your pics it looks like the stud rises about 5/8" above the nut for the right rear with the fuel line bracket. So, I would guess the total stud height projecting above the top of the carb base to be approximately 1 inch.

[Edward C.]

Re: 71 LT-1 carb stud

Just checked the AIM and it shows a stock nut and no washer.Gotta take my washer off. Ed

[Dave S.]

Re: 71 LT-1 carb stud

Thanks, Dave. It the nut is 5/16" thick, then from your pics it looks like the stud rises about 5/8" above the nut for the right rear with the fuel line bracket. So, I would guess the total stud height projecting above the top of the carb base to be approximately 1 inch.

Robert,
That looks right. I don't think any judges will be measuring but if you have around 1" to 1 1/8" you should be fine.

[Robert S.]

Re: 71 LT-1 carb stud

Just checked the AIM and it shows a stock nut and no washer.Gotta take my washer off. Ed

I also saw that in the AIM. But there must be a reason for the judging manual to specify a washer for 71.

[Robert S.]

Re: 71 LT-1 carb stud

Robert,
That looks right. I don't think any judges will be measuring but if you have around 1" to 1 1/8" you should be fine.

If I add in 1/2" for the carb base and 1/4" for the insulator/gasket, it looks like the total stud height above the intake manifold should be around 1 3/4".