1968 owners only please
Le Mans Master
Joined: Nov 2001
Posts: 8,570
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From: LONG ISLAND
2025 C3 ('68-'73) of the Year Finalist - Unmodified
2024 C3 of the Year Finalist - Unmodified
2023 C3 of the Year Finalist - Unmodified
Le Mans Master
Joined: Nov 2001
Posts: 8,570
Likes: 1,847
From: LONG ISLAND
2025 C3 ('68-'73) of the Year Finalist - Unmodified
2024 C3 of the Year Finalist - Unmodified
2023 C3 of the Year Finalist - Unmodified
Yes.
Yes, I really care what it was, because if it was originally a 435hp car I would locate a period correct intake, heads, carbs & block, deck it, broach it and restamp it so no one could tell it was counterfeit, then sell it at Barrett Jackson for a small fortune.
.......satisfied?
Yes, I really care what it was, because if it was originally a 435hp car I would locate a period correct intake, heads, carbs & block, deck it, broach it and restamp it so no one could tell it was counterfeit, then sell it at Barrett Jackson for a small fortune.
.......satisfied?
you know i'm just kidding right ?
Drifting
Joined: Jun 2006
Posts: 1,912
Likes: 12
From: Schaumburg (Chicago) Illinois
Le Mans Master
Joined: Nov 2001
Posts: 8,570
Likes: 1,847
From: LONG ISLAND
2025 C3 ('68-'73) of the Year Finalist - Unmodified
2024 C3 of the Year Finalist - Unmodified
2023 C3 of the Year Finalist - Unmodified
Le Mans Master
Joined: Jun 2005
Posts: 5,447
Likes: 3
From: Syracuse NY
Le Mans Master
Joined: Nov 2001
Posts: 8,570
Likes: 1,847
From: LONG ISLAND
2025 C3 ('68-'73) of the Year Finalist - Unmodified
2024 C3 of the Year Finalist - Unmodified
2023 C3 of the Year Finalist - Unmodified
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Drifting
Joined: Jun 2006
Posts: 1,912
Likes: 12
From: Schaumburg (Chicago) Illinois
Again I don't claim to know anything but just last weekend I identified my differential as probably being original this way because the information and dates match. I read what the NCRS book said and then found the referenced stamping on my differential. Seeing is believing. I can post a picture if someone thinks I am wrong.
My differential is stamped 1 AO 9 12 67 which translates to:
1 = shift-1
AO = 3.70:1 Positraction small block,
9 12 67 is the date
Small block designations for 68 and early 69:
AK;AL;AM;AN;AO;AP;AS
Big block designations for 68 and early 69:
AT;AU;AV;AW;AX;AY;AZ;FA;FB;FC
Last edited by AWilson; Feb 24, 2008 at 12:04 AM.
Le Mans Master
Joined: Jun 2005
Posts: 5,447
Likes: 3
From: Syracuse NY
Well, there is more stamped on it, there is a 2 or 3 digit code.
Again I don't claim to know anything but just last weekend I identified my differential as probably being original this way. I read what the NCRS book said and then found the referenced stamping on my differential. Seeing is believing. I can post a picture if someone thinks I am wrong.
My differential is stamped 1 AO 9 12 67 which translates to:
1 = shift-1
AO = 3.70:1 Positraction small block,
9 12 67 is the date
Small block designations for 68 and early 69:
AK;AL;AM;AN;AO;AP;AS
Big block designations for 68 and early 69:
AT;AU;AV;AW;AX;AY;AZ;FA;FB;FC
Again I don't claim to know anything but just last weekend I identified my differential as probably being original this way. I read what the NCRS book said and then found the referenced stamping on my differential. Seeing is believing. I can post a picture if someone thinks I am wrong.
My differential is stamped 1 AO 9 12 67 which translates to:
1 = shift-1
AO = 3.70:1 Positraction small block,
9 12 67 is the date
Small block designations for 68 and early 69:
AK;AL;AM;AN;AO;AP;AS
Big block designations for 68 and early 69:
AT;AU;AV;AW;AX;AY;AZ;FA;FB;FC
I've got to get a copy now, I knew about the date codes and the codes telling what gear ratio but I didn't realize they also identified bb/sb.
Thanks for the post.
Drifting
Joined: Jun 2006
Posts: 1,912
Likes: 12
From: Schaumburg (Chicago) Illinois
Gas line is single on the 435 hp but I cant' think of a difference on the 390 and the SBC. In midyears, there was a difference in length so that the gas line ended at a different spot on the frame and had a slightly different angle in midyears, but I don't think that occurred in the 68.
NCRS says: L88, 400HP and 435HP (all Holley-equipped) cars have only a single line.
Last edited by AWilson; Feb 24, 2008 at 12:15 AM.
Drifting
Joined: Jun 2006
Posts: 1,912
Likes: 12
From: Schaumburg (Chicago) Illinois
Per NCRS:
Tachometer redlines for BB are:
5600 for 390 and 400 hp
6500 for 435 and 430 hp
power steering pumps:
Pumps on the 427 have a neck that is wider at the bottom than at the top and blends gradually into the body. SB have a rounded neck that extends forward of the pump body.
Emmission labels were on radiator in early 68 then it moved to the firewall above the master cylinder.
SB have a code; T,B,U,.
BB CODES ARE ; F;W;B;M;B;V;M
front spring codes:
SB = HS, HT
BB = HU, HV,
all F-41 = EA
only 427 had a rear sway bar.
Thats all I could find that wasn't engine related.
Tachometer redlines for BB are:
5600 for 390 and 400 hp
6500 for 435 and 430 hp
power steering pumps:
Pumps on the 427 have a neck that is wider at the bottom than at the top and blends gradually into the body. SB have a rounded neck that extends forward of the pump body.
Emmission labels were on radiator in early 68 then it moved to the firewall above the master cylinder.
SB have a code; T,B,U,.
BB CODES ARE ; F;W;B;M;B;V;M
front spring codes:
SB = HS, HT
BB = HU, HV,
all F-41 = EA
only 427 had a rear sway bar.
Thats all I could find that wasn't engine related.
Melting Slicks
Joined: Sep 2006
Posts: 3,377
Likes: 2,603
From: Burning Jet-A
Differentials are big block specific. The code for a 3:70 rear is different for a 327 car versus a 427 car, and certain differentail ratios were SB or BB only. In addition certain ratios were L-88 only. The rear carrier is the toughest thing to change out in my opinion.
Transmissions do not indicate the engine options, but 435 cars required close ratio transmissions which were not required on the more pedestrian L36 or L68 427's. The transmission must be an M21 for a 435 car, but any engine could get the M21. I am not sure when the M40 Automatic became available with the 435 cars, so if anyone has that date I would be very thankful! I know it came to the L-88 after the strike in 69, but when did the L71/L89 cars get it?
Transmissions do not indicate the engine options, but 435 cars required close ratio transmissions which were not required on the more pedestrian L36 or L68 427's. The transmission must be an M21 for a 435 car, but any engine could get the M21. I am not sure when the M40 Automatic became available with the 435 cars, so if anyone has that date I would be very thankful! I know it came to the L-88 after the strike in 69, but when did the L71/L89 cars get it?
Last edited by international blue; Feb 24, 2008 at 02:09 AM.
Drifting
Joined: Jun 2006
Posts: 1,912
Likes: 12
From: Schaumburg (Chicago) Illinois
Differentials are big block specific. The code for a 3:70 rear is different for a 327 car versus a 427 car, and certain differentail ratios were SB or BB only. In addition certain ratios were L-88 only. The rear carrier is the toughest thing to change out in my opinion.