70 LT1 Questions
Thread Starter
Tech Contributor
Joined: Aug 1999
Posts: 15,130
Likes: 3,938
From: Connecticut, USA
70 LT1 Questions
My buddy stopped over with his 62 tonight. It has a 70 LT1 in it. The fuel pump is leaking but it was too dark to see if it's rebuildable or just replaceable? Did these have a fuel return line on them? I don't know if the gas tanks on the 62 are like the C3's? It's feeding a Holley 780 dual feed carb. Also what are the lifter spec's for setting hot? I have one book that says .030"/.030" someone else said .024"/.030" which is correct?
Thanks this car is a blast to drive with a 4 speed and 3.55's :D
Gary
Thanks this car is a blast to drive with a 4 speed and 3.55's :D
Gary
Melting Slicks
Joined: Mar 1999
Posts: 2,845
Likes: 2
From: Apex NC
Re: 70 LT1 Questions (gtr1999)
Gary, LT-1's used a Holley carb originally and didn't have a fuel return line. As for the lifter specs, search the NCRS board archives for posts by Duke Williams. He's got the prescribed method and clearances.
Shannon
Shannon
Safety Car
Joined: Dec 1999
Posts: 3,589
Likes: 830
From: PA
Re: 70 LT1 Questions
My buddy stopped over with his 62 tonight. It has a 70 LT1 in it. The fuel pump is leaking but it was too dark to see if it's rebuildable or just replaceable? Did these have a fuel return line on them? I don't know if the gas tanks on the 62 are like the C3's? It's feeding a Holley 780 dual feed carb.
While I don't know what is installed on the engine now, the original fuel pump for 1970-1972 LT-1 was not intended to be rebuilt. There ARE people doing this, but I would be reluctant to have one on any of my cars. The original carburetor for all three years was a dual feed, 780 cfm Holley without a return line... Just as you observed.
Also what are the lifter spec's for setting hot? I have one book that says .030"/.030" someone else said .024"/.030" which is correct?
Thanks this car is a blast to drive with a 4 speed and 3.55's
Thanks this car is a blast to drive with a 4 speed and 3.55's
Sounds like a really neat car!
Regards,
Thread Starter
Tech Contributor
Joined: Aug 1999
Posts: 15,130
Likes: 3,938
From: Connecticut, USA
Re: 70 LT1 Questions (Rowdy Rat)
Thanks guys,
I pass the info along to my friend. He did tell me he set them at 30/30 hope that's not a problem. I found the info for him in one of my old vette manuals. I would just install a new ac pump on the car.
This car is a blast and good looking too-maroon/black. He had th eoriginal motor in the car when he got it about 30 years ago but a vette shop left it outside while working on it. The problem was it only had water in it and it was Winter! My friend even told the shop about it before he dropped it off. Well they went around a bit because the block was cracked after sitting outside for a while and the shop gave him a crate motor they had. It was still in the crate and turned out to be a 70 LT1! Not a bad trade for a 327-250 motor- but not original :rolleyes:
He said he smells gas fumes from around the rear of the car, but I wonder if part of what he smells is the pump leaking?
Thanks,
:cheers: Gary
I pass the info along to my friend. He did tell me he set them at 30/30 hope that's not a problem. I found the info for him in one of my old vette manuals. I would just install a new ac pump on the car.
This car is a blast and good looking too-maroon/black. He had th eoriginal motor in the car when he got it about 30 years ago but a vette shop left it outside while working on it. The problem was it only had water in it and it was Winter! My friend even told the shop about it before he dropped it off. Well they went around a bit because the block was cracked after sitting outside for a while and the shop gave him a crate motor they had. It was still in the crate and turned out to be a 70 LT1! Not a bad trade for a 327-250 motor- but not original :rolleyes:
He said he smells gas fumes from around the rear of the car, but I wonder if part of what he smells is the pump leaking?
Thanks,
:cheers: Gary
