69 Vette Numbers
Thread Starter
Instructor
Joined: Jan 2009
Posts: 112
Likes: 0
From: Rockwall, TX
69 Vette Numbers
I am pretty knowledgable when it comes to vettes but not an NCRS judge. I have a 69 vette numbers matching. I do not have the build sheet. Casting number on the block is 3955270 (L89) only. The suffix on the pad is LM. It has a 400hp shifter plate. Motor now has a GM intake with a single carb. I have seen many changed and strange things over the years. If anyone with knowledge can help me on this it would be appreciated.
Race Director
Joined: Oct 2000
Posts: 12,628
Likes: 3,099
From: Shamong, NJ
I think that 3955270 was used for all 427 horsepower applications in early 69, not just the L89.
LM code is 427/390 horse with a 4 speed. The intake should be # 3947801 and the carb should be a Rochester Q-Jet.
Shift plates and the data plates get changed around all the time. I've known a lot of people who've put higher horse plates in their car when they've modified the engine and increased the horsepower.
LM code is 427/390 horse with a 4 speed. The intake should be # 3947801 and the carb should be a Rochester Q-Jet.
Shift plates and the data plates get changed around all the time. I've known a lot of people who've put higher horse plates in their car when they've modified the engine and increased the horsepower.
Race Director
Joined: Jul 2001
Posts: 15,892
Likes: 42
All true.
Thread Starter
Instructor
Joined: Jan 2009
Posts: 112
Likes: 0
From: Rockwall, TX
These car have gotten so old now. Many things get changed. You are correct in what you say, but according to vette vues 3935439 / 3963512 with 3955270 being optional on the L89 but including the other casting numbers also.
Melting Slicks
Joined: May 2009
Posts: 3,079
Likes: 314
2024 C3 of the Year Finalist - Unmodified
L89 aluminum cylinder heads were for the L71/435 HP engine with 4 bolt mains. They only put them on a total of 390 cars...pretty rare. The suffix code on the stamp pad for an L71 with aluminum heads should be LP (manual), LU (manual with HD clutch) or LW (automatic). If your stamp pad is LM, that is the L36/390 HP 2-bolt main engine with manual transmission. They only came with iron heads #3931063.
Thread Starter
Instructor
Joined: Jan 2009
Posts: 112
Likes: 0
From: Rockwall, TX
Thanks for the information. I have been buying and selling corvettes for over twenty years as a hobby and for profit. This is one of those cars that is a little strange. It has a turbo 400 and no signs of being a manual. I will get it all figured out soon.
Just a little story. My dad has always bought everything from a very small dealership. Everything he buys is ordered. He has been doing this since the early sixties. He has managed to get some combinations that supposedly were not available. He had a 77 nova with a high horsepower 350, 4spd, 3:73 rear, bench seat, non super sport. I remember this car the most because it was gonna be my first car. It did not happen. My brother smoked many era camaro and firebirds with it though. From his first new ordered vette a 67 427 to his latest an 08. It is great to deal with a small dealership. Unlike Dallas where I live. Where they pretty much force you to buy there overstock or charge you with ridiculous prices for ordering what you want.
Just a little story. My dad has always bought everything from a very small dealership. Everything he buys is ordered. He has been doing this since the early sixties. He has managed to get some combinations that supposedly were not available. He had a 77 nova with a high horsepower 350, 4spd, 3:73 rear, bench seat, non super sport. I remember this car the most because it was gonna be my first car. It did not happen. My brother smoked many era camaro and firebirds with it though. From his first new ordered vette a 67 427 to his latest an 08. It is great to deal with a small dealership. Unlike Dallas where I live. Where they pretty much force you to buy there overstock or charge you with ridiculous prices for ordering what you want.
