L71?

[Mark H.]

Re: L71?

Help us out here...what have you got? Auto or four-speed?

Sorry, its a 4 speed

[Tom R.]

Re: L71?

Sorry, its a 4 speed

See if this helps...
tranny.jpg

[Patrick B.]

Re: L71?

68-Camaro P8P08 8N339528.jpg

OK, thanks for the correction. Can somebody fill me in on the location of the transmission numbers and how to decipher them?

Here is a picture of a 68 Camaro Muncie. The Muncie date code and the Corvette VIN derivative will be in the same location on a 68-up Corvette trans case. They were in different locations on 63-67 Corvettes.

[Mark H.]

Re: L71?

[ATTACH=CONFIG]54357[/ATTACH]

Here is a picture of a 68 Camaro Muncie. The Muncie date code and the Corvette VIN derivative will be in the same location on a 68-up Corvette trans case. They were in different locations on 63-67 Corvettes.

Thanks for the info!

[Richard M.]

Re: L71?

There will be a upcoming Restorer article about a '67 L71 with a 283 in it for the last 25 years of life before "Reincarnation".....

Mark, welcome!

So..... first glance at the fuel line kinda tells me it may not be a BB line, but not conclusive. The BB line is more of a longer one towards the control arm and then a 90* bend. This to get it closer to the BB fuel pump which is further forward. Another sign would be the rear differential case assembly code and date code. On the flat at the rear of the case will be the code and date. It's different for BB vs SB.

Also, I'm no too C3 savy, but I think there's a code label on the back of the cluster on the C3's, as there is on C2's. If so, it's a white label with Red letters. See if you can see it back up in there. You may need a 2 year old child to fit in there that knows how to use a flashlight, mirror, and digital camera though.

Rich

[Jim T.]

Re: L71?

Mark I found the build sheet on my original owner 1968 when I removed the radio for repair in the 80's. It was behind the radio. My 68 small block 327/350 L79 has a return fuel line that originates from the fuel filter.

[Mark H.]

Re: L71?

Mark

You have check just about everything but I see no reference to the transmission. You might check it for the VIN derivative and see if it yields information of significance.

OK, I got the numbers off the transmission.

photo.jpg

Looks like the top number is P8H12 which would be a June 12, 1968 build date.
Bottom number is 18S424032. The last 8 characters match the last 8 characters of the VIN number by the windshield so it looks like it has the original tranny. Anything else I can get from these numbers?

[Rich G.]

Re: L71?

My 1968 L71 built July 18 has a VIN OF 25941.The POP says the tranny is P8H27.

Rich

[Mark H.]

Re: L71?

There will be a upcoming Restorer article about a '67 L71 with a 283 in it for the last 25 years of life before "Reincarnation".....

Mark, welcome!

So..... first glance at the fuel line kinda tells me it may not be a BB line, but not conclusive. The BB line is more of a longer one towards the control arm and then a 90* bend. This to get it closer to the BB fuel pump which is further forward. Another sign would be the rear differential case assembly code and date code. On the flat at the rear of the case will be the code and date. It's different for BB vs SB.

Also, I'm no too C3 savy, but I think there's a code label on the back of the cluster on the C3's, as there is on C2's. If so, it's a white label with Red letters. See if you can see it back up in there. You may need a 2 year old child to fit in there that knows how to use a flashlight, mirror, and digital camera though.

Rich

Thanks for the welcome!

Is it possible the fuel line was cut to get it back in line with the small block fuel pump?

Thanks for the tip on the differential number. Still need to get that.

[Tom R.]

Re: L71?

Looks like the top number is P8H12 which would be a June 12, 1968 build date.
Bottom number is 18S424032. The last 8 characters match the last 8 characters of the VIN number by the windshield so it looks like it has the original tranny. Anything else I can get from these numbers?

That's great news. While am not as familiar with the Muncies, an A, B, C code was used after the "P8H12" that indicated the ratio.

A = M20
B = M21
C = M22

I am not seeing a ratio code on your tranny. maybe others can add to this for clarification.

[Edward B.]

Re: L71?

The ratio indicator didn't start until October 21st, 1968. Since his transmission was assembled before this, the OP will need to pull the transmission to count the rings on the input shaft to see what he has. Of course, this assumes the transmission's never been rebuilt and things changed.

Ed

[Richard M.]

Re: L71?

Thanks for the welcome!

Is it possible the fuel line was cut to get it back in line with the small block fuel pump?

Thanks for the tip on the differential number. Still need to get that.

Anything's possible in a car's prior life. Check to see if there's a splice under there somewhere further back.

When you get the rear diff code that'll help, but of course, that's a item that can be changed just like other L71 parts.

[Edward B.]

Re: L71?

The transmission's really not going to be a deciding factor in this since the M21 (which is what you "should" have) was used on other engines as well.

If you have an M22, you have an L88. (That was the only engine this transmission was used on)
If you have an M21, it could be an L71, but it could also be an L79, L36 or L68.
If you have an M20, it could be a base 327/300, an L79, an L36 or an L68, but NOT an L71. (The L71 could only be ordered with the M21)

So you can see it's not really going to help you figure out what the original engine the car came with unless it's an M22 (and it's never been rebuilt with different parts).

Ed

[John C.]

Re: L71?

Mark

Your fuel line is correct for a 1968 BB with a single fuel line. There were no sharp bends at the ends. Attached is a picture of an original. It does look like yours has been bent some to make it work better with the SB engine.

John

[Richard M.]

Re: L71?

Hmm, interesting. I always thought the BB had a different line on the C3's as the C2's did. Thanks for clarifying. It looks like Mark's is the same as yours, only as mentioned his is bent towards the engine more.

Did only the small block use the fuel return line, not the big blocks? I know just a little bit about the C3's as you can see, but like to learn.

Good news for Mark. However, wait till he sees 427 4-bolt main and square port head prices...Yikes.




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