Lt 1 ??
Melting Slicks
Joined: Mar 2007
Posts: 2,100
Likes: 12
From: Frederick Maryland
The LT-1 was the highest performing small block Chevrolet produced for production until the '90s. It was only produced for the '70, '71 and '72 model years.
It was a solid lifter, high rpm engine. For '70 it was rated at 370 hp, though a bit less the last two years due to the change to unleaded gas and emissions control and the use of net, not gross horsepower ratings.
There weren't all that many made, though they were also available in Camaros. I don't know if you could get them in a Chevelle.
It was a solid lifter, high rpm engine. For '70 it was rated at 370 hp, though a bit less the last two years due to the change to unleaded gas and emissions control and the use of net, not gross horsepower ratings.
There weren't all that many made, though they were also available in Camaros. I don't know if you could get them in a Chevelle.
Melting Slicks
Joined: Nov 2004
Posts: 2,672
Likes: 6
From: Nevada City California
Not available in Chevelles. Camaros used a similar engine, but was never referred to as an LT-1. The camaros version used different exhaust manifolds, different air cleaner assembly and different ignition set up.
Melting Slicks
Joined: Oct 2001
Posts: 2,065
Likes: 1,395
From: Halifax, Nova Scotia, Canada
The technical part of an LT-1 (350cu in / 370hp)
- Open element/ dropped base air cleaner.
- Holley 800 CFM Carb.
- Dual plane Aluminum high rise intake.
- Solid lifter cam.
- Forged TRW domed pistons ('70 only, flat tops for '71-'72)
- Large valve 64cc heads, Intake 2.02", 1.6" exhaust
- Screw in rocker studs with guide plates.
- Performance rocker arms "0"
- Hardened push rods.
- Aluminum valve covers.
- Maga fluxed - Shot peened connecting rods (Pink Rods)
- Forged Steel crank, tufftrided journal surfaces.
- 4 bolt main bearing block
- High pressure oil pump.
- Electronic high voltage ignition (Transistor Ignition)
All this provided for an excellent performing/reliable engine.
Barry
- Open element/ dropped base air cleaner.
- Holley 800 CFM Carb.
- Dual plane Aluminum high rise intake.
- Solid lifter cam.
- Forged TRW domed pistons ('70 only, flat tops for '71-'72)
- Large valve 64cc heads, Intake 2.02", 1.6" exhaust
- Screw in rocker studs with guide plates.
- Performance rocker arms "0"
- Hardened push rods.
- Aluminum valve covers.
- Maga fluxed - Shot peened connecting rods (Pink Rods)
- Forged Steel crank, tufftrided journal surfaces.
- 4 bolt main bearing block
- High pressure oil pump.
- Electronic high voltage ignition (Transistor Ignition)
All this provided for an excellent performing/reliable engine.
Barry
Racer
Joined: Feb 2007
Posts: 331
Likes: 1
Barry: Do you know the part number that is on top of the pistons in the LT1's? Are they labled "TRW" on the inside of the piston? Do the rods have a specific part number?? I believe I have a 69 350 350HP disassembled in my garage but when I saw TRW on the inside of the piston I figured they were aftermarket? Looking for some pictures of the pistons or ways to ID them?
Le Mans Master
Joined: Jan 2007
Posts: 5,485
Likes: 7
From: Peekskill NY
The LT-1 was available in 69 but only as a dealer installed option. Wasn't promoted. Didn't make the sales brochures untill 70. A friend of mine has a 69 with the LT-1 options on it, and it has the small block hood. As far as he can tell all the date codes are correct for the carb, intake and heads for 1970, and even the data plate on the console has the 370 hp. Yes I know anyone can put one of these on their cars but this looks legit. My guess is that the owner had the option added the year after they bought the car.
I read that article that a guy named Jeff Butler provided a 69 LT-1 for performance comparisons, though the story didn't say if this was the only one ever produced. Interesting.
Glenn
I read that article that a guy named Jeff Butler provided a 69 LT-1 for performance comparisons, though the story didn't say if this was the only one ever produced. Interesting.
Glenn
Melting Slicks
Joined: Oct 2001
Posts: 2,065
Likes: 1,395
From: Halifax, Nova Scotia, Canada
Barry: Do you know the part number that is on top of the pistons in the LT1's? Are they labled "TRW" on the inside of the piston? Do the rods have a specific part number?? I believe I have a 69 350 350HP disassembled in my garage but when I saw TRW on the inside of the piston I figured they were aftermarket? Looking for some pictures of the pistons or ways to ID them?
I didn't clean the carbon off the top if it to see if there was a part number.
If you think there's one there, I can clean the carbon and let you know.
I attached a couple of pictures showing the "TRW" logo on the inside of the original pistons.
You asked if the rods have a specific part number..... I'm not sure what you mean, I don't believe there is a part number on the rod itself, however the 350/350 and LT-1 rods have a specific part number in the parts manual, as they are the "pink" rods. Magafluxed and shot peened.
Regular 350 rods did not get this process.
Barry
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Drifting
Joined: Aug 2004
Posts: 1,354
Likes: 0
The LT-1 was available in 69 but only as a dealer installed option. Wasn't promoted. Didn't make the sales brochures untill 70. A friend of mine has a 69 with the LT-1 options on it, and it has the small block hood. As far as he can tell all the date codes are correct for the carb, intake and heads for 1970, and even the data plate on the console has the 370 hp. Yes I know anyone can put one of these on their cars but this looks legit. My guess is that the owner had the option added the year after they bought the car.
I read that article that a guy named Jeff Butler provided a 69 LT-1 for performance comparisons, though the story didn't say if this was the only one ever produced. Interesting.
Glenn
I read that article that a guy named Jeff Butler provided a 69 LT-1 for performance comparisons, though the story didn't say if this was the only one ever produced. Interesting.
Glenn
