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Topic: Need 70 LT1 information

in Forum: C3 Engines

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Need 70 LT1 information

Posted: 11/30/08 12:43pm Message 1 of 21
VetteSpecialties
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Mounds View, MN - USA
Joined: 5/24/2007
Posts: 1031
Vette(s): 70 LT1 coupe, 69 350 HP coupe, 69 390HP 427 coupe, 71 LS5 convert, 85 coupe, 93 coupe
After letting it sit for 11 years, I am starting the restoration of my '70 LT1 coupe.  Does anyone know for sure the difference between the three suffix codes?  I know CTV is the ZR1, but there  CTR, CTU, and CTK.  All three are listed as 370 HP, manual trans, and transistor ignition.  Mine is CTU.

My car was fairly complete, but had the wrong intake and carb, and a replacement radiator with no fan shroud.  I am almost certain I should have the wide (27.5") radiator and a plastic shroud, but am not certain if the radiator should be aluminum.  And I have seen pictures of LT1s with metal shrouds.  Some LT1s had AIR pumps, but not all. 

Any LT1 experts?

Thanks
Larry



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Need 70 LT1 information

Posted: 11/30/08 4:03pm Message 2 of 21
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lukesvette
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HOWELL, NJ - USA
Joined: 5/18/2004
Posts: 6812
Vette(s): 1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.
Here ya go Larry. Hope this is what you're looking for:
 



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Need 70 LT1 information

Posted: 11/30/08 5:16pm Message 3 of 21
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corvette440hp
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Paul, that is one great site..........thanx for that infoThumbs%20Up


corvette440hp

Need 70 LT1 information

Posted: 11/30/08 5:28pm Message 4 of 21
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lukesvette
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HOWELL, NJ - USA
Joined: 5/18/2004
Posts: 6812
Vette(s): 1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.
Actually, I just realized that the above link lists all the engine codes but does not tell you the differences.
 
After a bit more investigation, it looks like an LT1 with both a M22 trans and transistor ignition could be either a CTR or a CTU block.  Looks like CTK is listed as a non-M22 type manual trans. Here's another site with similar info (but doesn't list CTR):
 
 
Wondering if the it could be whether the block came from Flint or Tonawanda.....?



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Need 70 LT1 information

Posted: 11/30/08 5:37pm Message 5 of 21
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lukesvette
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HOWELL, NJ - USA
Joined: 5/18/2004
Posts: 6812
Vette(s): 1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.
OK Larry, here's the answer according to Rowley Corvette.
 
 
"
CTL.. 350 ..300 . Roch. Q-jet & 4-Speed
CTD* 350..300...Roch. Q-jet & 4-Speed
CTM . 350.300 . Roch. Q-jet & THM
CTG* 350..300...Roch. Q-jet & THM
CTN . 350..350 . Roch. Q-jet, Perf. Cam, 4-Spd
CTH* 350..350...Roch. Q-jet, Perf. Cam, 4-Spd
CTO . 350..350.. Roch. Q-jet, Perf. Cam, A/C, 4-Spd
CTJ* . 350.350.. Roch. Q-jet, Perf. Cam, A/C, 4-Spd
CTP . 350 .350.. Roch. Q-jet, Perf. Cam, T/I, 4-Spd
CTQ . 350..350.Q-jet, Perf. Cam, A/C, T/I, 4-Spd
CTU . 350.370 Holley, Mech. Lftrs, T/I, 4-Spd
CTK* 350.370 Holley, Mech. Lftrs, T/I, 4-Spd
CTV . 350..370 Perf. Pkg, LT1 Engine, M22 4-Speed
CZU . 454.390 Roch. Q-jet, Hyd. Lifters & 4-Speed
CGW. 454 390 Roch. Q-jet, Hyd. Lifters & THM
CRI .. 454 .390 Roch. Q-jet, Hyd. Lifters, T/I, 4-Spd
CRJ . 454 .390 Roch. Q-jet, Hyd. Lifters, T/I, THM
CZL 454**465 Holley, Mech. Lftrs, Alum. Hds, 4-Spd
CZN 454**465 Holley, Mech. Lftrs, Alum. Hds, THM
Note: Carburetion is either Rochester Quadrajet single
four-barrel; or Holley single four-barrel (1x4). M22 is
Heavy-Duty Four-Speed Trans;THM = Turbo Hydra-
Matic Transmission (M40);A/C = Air Conditioning (C60);
TI = Transistor Ignition. Engine codes with an asterisk (*)
indicate the new code introduced during the 1970 model
year, replacing the earlier listed code; (**) LS7 listing is
for infermation only; records indicate none were produced
for sale. A "CTR" engine code (LT1 w/ TI) has appeared
in print, but records indicate it was not used."
 
 
Well, I just had to know too!!   Big%20smile
 
Regards
 
Paul
LukesVette2008-11-30 17:38:31


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Need 70 LT1 information

Posted: 12/1/08 8:15am Message 6 of 21
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MikeMc71
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Tucson, AZ - USA
Joined: 10/7/2007
Posts: 341
Vette(s): 1970 White L-46 Air Roadster, 1971 White LT1 Coupe, 1971 Red Auto Air Coupe, 383 stroker, 430 HP, 2002 Millennium Yellow Auto Coupe
Hey there Larry, the ONLY metal shrouds were supposed to be ZR1s. They all had the big block radiator, with no external expansion tank. ALL LT-1s came stock with A.I.R. pumps. There is quite an extensive list of things to look for on an LT-1.
 
The carb, intake, and A.I.R. set-up will cost you a fortune to replace, but worth the investment in the end! I see all those parts on eBay from time-to-time, and I have seen some in Driveline.
MikeMc712008-12-01 08:16:27



Need 70 LT1 information

Posted: 12/1/08 10:37am Message 7 of 21
VetteSpecialties
Former Member
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Mounds View, MN - USA
Joined: 5/24/2007
Posts: 1031
Vette(s): 70 LT1 coupe, 69 350 HP coupe, 69 390HP 427 coupe, 71 LS5 convert, 85 coupe, 93 coupe
Thanks for the input!

Does anyone else have proof that all LT1s had A.I.R.?

Any idea about copper/brass or aluminum radiator?

Thanks
Larry



Need 70 LT1 information

Posted: 12/1/08 2:26pm Message 8 of 21
rearn2go72
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Bladenboro, NC - USA
Joined: 1/22/2006
Posts: 1058
Vette(s): 1972 conv., sunfire yellow, blk interior, blk vinyl and convertible top. Off frame restoration with American Speed 383 stroker engine producing 500hp plus a 200hp NOS system. MSD ignition. Hooker super competition headers with chambered exhaust.
I have no documentation to prove this  but I have never seen or heard of an original LT1 without A.I. R.


Need 70 LT1 information

Posted: 12/1/08 2:47pm Message 9 of 21
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Gunslinger
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Frederick, MD - USA
Joined: 9/8/2003
Posts: 3398
Vette(s): 1969 convertible L71 427/435 4-speed black interior
To the best of my knowledge and every source I've seen all Chevy engines came with AIR then...even performance engines.  I guess it's possible that cars for export may not have had it, but that's just a guess.

After so many years, it's not at all unusual for the AIR to be missing.  Correct date coded AIR equipment can be expensive to come by.



Need 70 LT1 information

Posted: 12/2/08 8:16am Message 10 of 21
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MikeMc71
Former Member
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Tucson, AZ - USA
Joined: 10/7/2007
Posts: 341
Vette(s): 1970 White L-46 Air Roadster, 1971 White LT1 Coupe, 1971 Red Auto Air Coupe, 383 stroker, 430 HP, 2002 Millennium Yellow Auto Coupe
I believe that the only small blocks with aluminum radiators were again, the ZR1s. All the others were copper, but I am not certain. My LT-1 has a copper radiator, and I do believe its original. Mine is also missing the A.I.R. system.



in Forum: C3 Engines


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