70 LT-1 visuals

[Dennis D.]

Probably in the archives , but to old and lazy to check. So, if anyone feels the same about answering I understand.
The short story is plan to buy a 70 LT-1. Want to be able to takes pics of areas where things are "LT1-ish". Such as half shafts, there or not ti setup, and the like. Thanks in advance

[Mike F.]

Re: 70 LT-1 visuals

Single fuel line from tank to fuel pump, T.I. distibutor/coil/amplifier, 6500rpm tach, block-type caps vs. U-shaped clamps on half shafts, exhaust manifolds with A.I.R. fittings.

Now you'll know just enough to be dangerous.

[Dennis D.]

Re: 70 LT-1 visuals

Thanks for the replies. Guess I should have mentioned I'm painfully familiar with the 70. Mainly my L46 I've had since 73. Just looking for the differences I can photo while looking and check out when I get home

[Mike F.]

Re: 70 LT-1 visuals

What's the VIN on your 70? My 70 L-46 is 9516.

[Dennis D.]

Re: 70 LT-1 visuals

2981 for me

[Ralph S.]

Re: 70 LT-1 visuals

I have 6242 C10 3/10/70 LT-1 conv. Green/Green I have had this since 1974

[Kenneth H.]

Re: 70 LT-1 visuals

Dennis, below is a list of most of the "tells" that I put together some time ago (from other members comments):

2. All LT-1's are 4 speeds (M20 was standard, M21 was optional).

3. Tach has 6,500 RPM red line and the console tag will show 370hp.

4. All 70 LT-1's came with the A.I.R. system. If A.I.R was removed manifolds shouldstill have holes for the tubes.

5. LT-1's had copper radiator without an overflow canister on the passengerside fender well. There should also be no holes where one had been mounted.

6. All 70 LT-1's had Transistor Ignition. It may have been removed, but if itwas removed look for the 3 holes on the front face of the driver side innerfender well where the Amplifier box was mounted.

7. The aluminum intake manifold should have a Winters snowflake with casting #3959594.

8. LT-1's had a Holley carb so there is only 1 fuel line, and no return linelike a Quadra-jet carb. Also the fueltank is different. There should be no nipple on the passenger side, side wallfor a return line.

9. LT-1's had solid lifters/flat tappets and make a distinct sound when theengine is running.

10. LT-1's use 2.5" exhaust pipes like the big block cars. But themanifolds were still 2" set up. So the pipes flair from 2 to 2.5"about 6 inches from the manifold. The exhaust hangar at the transmission isalso different.

11. LT-1's have the same heavy duty half shaft retainers as big block cars. Lookat the rear end side yokes, there should be caps with bolts. Base cars used Ubolts with nuts.


Some timeduring the production year the 5 quart pan was introduced and the smaller sizeallowed for accommodation of power steering.

Hope it helps.

[Dennis D.]

Re: 70 LT-1 visuals

Perfect Ken. Thats a great bunch of info. Car is supposed to have NA9. Is the carb different in that case? Also not an original California car, but I seem to remember that all NA 9 cars didn't necessarily originate the order from there

[Mike E.]

Re: 70 LT-1 visuals

My L46 convertible is 6243. It followed Ralph's car on the line. Maroon/black with vinyl hardtop. Bought from original owner.

[Roy V.]

Re: 70 LT-1 visuals

Mr. Hoffman,in regards to your point #2, all LT-1's are 4 speeds, I agree with that, however, I thought the M21 transmission was the standard transmission that came with LT-1's. Please forgive me if I'm wrong about this.
Regards
Roy

[Michael F.]

Re: 70 LT-1 visuals

M21 std but you could order M20 with certain rear axles like 3.55. I have 88xx (don't remember last numbers) mulsanne blue coupe

[Patrick B.]

Re: 70 LT-1 visuals

I have #14297 a Bridgehampton Blue 70 Lt-1 coupe. It and all other real 70 Lt-1s I have seen have the holes in the trailing arms for rear stabalizer bar brackets even though they do not have the bars.

[Kenneth H.]

Re: 70 LT-1 visuals

Roy, yes, as Michael stated the M21 was standard equipment on the 1970 LT1s. The M20 was optional. I've corrected my information.

Dennis, I'm not sure about the NA9 cars. Terry M. is the expert and hopefully he'll chime in at some point to answer your question.

[Terry L.]

Re: 70 LT-1 visuals

NA9 option LT1 has a different carb, Holley part no. 3972123 list 4489 along with an aluminum heat shield between carb and intake and associated vapor canister and hoses. Non NA9 option is 3972121 list 4555

The LT1 could be ordered with either M20 wide ratio or M21 close ratio.
Standard axle ratio for the M20 wide ratio transmission was 3.55
Optional economy ratio 3.36, performance ratio 3.70.
Standard axle ratio for the M21 close ratio transmission was 3.70
Optional economy ratio 3.55, performance ratio 4.11

Perfect Ken. Thats a great bunch of info. Car is supposed to have NA9. Is the carb different in that case? Also not an original California car, but I seem to remember that all NA 9 cars didn't necessarily originate the order from there

[Timothy B.]

Re: 70 LT-1 visuals

Dennis, below is a list of most of the "tells" that I put together some time ago (from other members comments):

2. All LT-1's are 4 speeds (M20 was standard, M21 was optional).

3. Tach has 6,500 RPM red line and the console tag will show 370hp.

4. All 70 LT-1's came with the A.I.R. system. If A.I.R was removed manifolds shouldstill have holes for the tubes.

5. LT-1's had copper radiator without an overflow canister on the passengerside fender well. There should also be no holes where one had been mounted.

6. All 70 LT-1's had Transistor Ignition. It may have been removed, but if itwas removed look for the 3 holes on the front face of the driver side innerfender well where the Amplifier box was mounted.

7. The aluminum intake manifold should have a Winters snowflake with casting #3959594.

8. LT-1's had a Holley carb so there is only 1 fuel line, and no return linelike a Quadra-jet carb. Also the fueltank is different. There should be no nipple on the passenger side, side wallfor a return line.

9. LT-1's had solid lifters/flat tappets and make a distinct sound when theengine is running.

10. LT-1's use 2.5" exhaust pipes like the big block cars. But themanifolds were still 2" set up. So the pipes flair from 2 to 2.5"about 6 inches from the manifold. The exhaust hangar at the transmission isalso different.

11. LT-1's have the same heavy duty half shaft retainers as big block cars. Lookat the rear end side yokes, there should be caps with bolts. Base cars used Ubolts with nuts.


12. Early 70 LT1s couldn’t be ordered with power steeringdue to the 6 quart oil pan.Some timeduring the production year the 5 quart pan was introduced and the smaller sizeallowed for accommodation of power steering.

Hope it helps.

Ken,

I thought the intake manifold part # was different than what you posted. Were there two different intake's in the 1970 M/Y?