67 Alt. Pulley 3844100

[plumL78]

Yes Jeff you are correct . I will post another pic of the orig owner  07B five rivet small fan to. We think these parts came on the later L78s.  Jerry M has paper work from GM  that calls out for the big  clutch  for L78s but for sure not every car got it.  I believe the 04B 4Pcar  has the big fan.

[plumL78]

Here is the orig owner 07B small fan

[jbtech]

Thanks to this thread I've been able to confirm the correct part needed for my 67 L78 and got my hands one one. What a big difference between the L78 and Z28 Pulley.

[john302]

If your L78 was built in La its a good chance that pulley is incorrect. Found three original La built l78s with a dual belt pulleys . Have photos to prove it.

[john302]

The dual pulley on the La built L78s has nothing to do with the smog system on the Ca sold cars.

[cook_dw]

His is a NOR car. And yes that has been discussed previously on either here or sYc.  It is a interesting topic regarding the double pulley.  Still have yet to determine the reasoning unless new information has come to light.

[plumL78]

i know  Larry C.  has talked  about  cars having the double pulley. There are around 5 survivor cars in the reg. and all have the 100 pulley. I believe they are all norwood cars

[jbtech]

I have received photos of my original L78 04D engine as pulled in the late 60's early 70's by the original owner. The pulley is definitely a 3844100. However it does NOT have a stamp but as previously discussed, later NOR cars appear to have a stamp. I include this data to prove early NOR L78 cars also used the 3844100 as illustrated in the AIM.
Jose