69 Nova sending unit
 

Hoping someone here may have some info on the differences between L34 and L78 sending units. I’ve got a 69 Nova that I believe was an L78 and was under it yesterday getting pictures of the single fuel line and noticed the sending unit only has one single 3/8ths line coming out. I’ve done some research but no one’s ever given a set answer. I would assume the L34 would return to the tank through the sending unit?

A L34 would have had a return line. I looked in a 69 Assembly Manual to make sure and it does show a return back to the tank. So, it looks like you have a L78 setup. Post some more pics of the car you have. Guys here love the pics...

Do you have access to the two different parts numbers for the sending units?

Im still looking for info regarding driveshaft stripe colors also. Thanks for replying.

Part# 6428846 is for a 69&70 L34 Nova and Camaro, and #6427872 should be for the L78 Novas & Camaros. Hope this helps because that's all I could find out.

That was exactly what i was looking for, now if i could come up with some driveshaft stripe info or build sheet examples.

Sorry, I can't help with the driveshaft stripes. Maybe Tom Williams can help??

I'm open to anything 114279w468688. I've looked through the orphan parts and haven't had any hits on that vin but a guy can hope. the car was no question a big block, and with the clues i have it was an L78 i just want to have good proof (although i know this is a losing battle) id like to at least be able to stand my ground.

Being a 3.31 gear car i would assume it would've been m20.

I found 6428845 as the part number for the 1969 Nova L78 sending unit in my parts catalogue (as shown at bottom of picture) Good luck !

The 3:55 gear (BT) was default for 69/70 L78 Nova, and 3:31 (BS.?) for L34, but could be optioned out anyway you wish. There are old threads here that are specific to BB Nova sending units, apparently there were assembly line some anomalies according to the threads, but who knows for sure. There are also old threads on Dshaft stripes, just have to dig

Ive looked for good info on dshaft stripes and havent found a solid answer, im sure there were assembly line anomalies but to have a single fuel line and correct alt with pulleys as well as the clips being different for the l34 fuel lines etc im still leaning towards l78, this sending unit has never been out nor has the fuel lines.....but without a block or paperwork who knows. the fuel pumps were different between l34 and l78 so if it was an l34 and it got a single fuel line then it would've had to use the l78 pump...i doubt it

link to drive shaft thread

https://www.yenko.net/forum/showthre...+shaft+stripes

Looks like those stripes are for th400 not 4 speed. Thank for taking the time to look.

curious, what is the length u joint center to center on the driveshaft you have (4 spd L78).?

I think it’s 52, I’ll have to measure again not positive on that.

Thx, always has been a question of what the correct length is on a 69,70 OEM BB 4spd Drive shaft. I too think it is a 52" as well, but...

the other d shaft paint stripe thread I was looking for

https://www.yenko.net/forum/showthre...e+shaft&page=4

I have been looking at 3rd Gen Nova driveshaft stripes for a while. Just not enough examples. There are several known stripe patterns.

In 1968 there are seven driveshaft service part numbers and three yoke types with multiple part numbers.

In 1969 there are three driveshaft service part numbers and three yoke types

In 1970 there are the three 1969 driveshaft service part numbers plus one new one for 1970 plus the three yoke types.

On this site there are reports of three 1969 L78 T. H. 400 (M40) driveshaft combinations.

The sparse number of broadcast sheets doesn't help.

In theory is there are five combinations:

Nova (exc. T.H. 400) w/3-Spd, P.G., 4-Spd Non SS
Nova (exc. T.H. 400) w/T.H. 350 Non SS
Nova w/2-Dr. (T.H. 350), w/4BC (350)
Nova w/4-Spd. (350, 396) w/special 3-Spd, SS w/4Spd
Nova w/T.H. 400 (396)

With 1969 4 Speed there was an early and late version. Your 69 Nova is late according to the VIN. I would just put back what you found.