My new 1968 Nova L79 project.

[WILMASBOYL78]

Very Nice.. [img]<<GRAEMLIN_URL>>/biggthumpup.gif[/img]

wilma

[day2killa]

now thats clean

[jasonL78]

Ok looking for a little help from the forum. I was just going to bolt my AC bracket on the intake the other night and I realized I never seen this bracket with the idler pulley on it. The L79 is a manual transmission car so it would have smog for 1968 correct? I only know of one other 1968 SB nova with AC and it is an automatic car. So GM installed no smog on the automatic. Correct?
This is my concern the 68 automatic car has a 2 groove water pump pulley and 2 a groove crank pulley. My car still had its original 2 groove crank pulley, AC compressor, AC brackets, but not the correct water pump pulley. I was assuming I would need a 2 groove water pump pulley for an AC car. But now I am stumped with the smog pump, AC compressor, and this idler pulley. Does anyone have a picture of a 1968 GM car that has a manual transmission with AC and smog? Or even a belt diagram for the 1968 GM motors?
My concern is will I need a 3 groove water pump pulley and if so what is the part number.

Thanks Jason

This is the idler pulley I am referring to:

[kwhizz]

Wow!! Good question....... [img]<<GRAEMLIN_URL>>/hmmm.gif[/img] [img]<<GRAEMLIN_URL>>/hmmm.gif[/img]

[jasonL78]

Wow did I stump the board? These are the part numbers I cam up with for a 3 groove water pump pulley for 1967 and 1968, I think they are SB part numbers. They are 1967-3906657 DP and 1968-3908920 DQ.
This was the motor I found on e-bay out of a 68 L79 corvette but it doesn't have AC. As you can see it has the 3 groove pulley.I will get some more pictures of the bracket this weekend bolted back onto the motor. The idler pulley is what has got me stumped? In my picture I posted of my motor it looks like the idler pulley is behind the AC compressor. So it must be part of the smog?

[jasonL78]

The e-bay ad said this was a 68 motor but I see ram manifolds with smog. I thought those were 66-67??????

[jasonL78]

I think I found it. But I dont see the idler pulley. Looks like I will need to talk with the original owner.

[jasonL78]

Been busy! Motor and transmission installed into the subframe.









I tried to duplicate the subframe markings I found.





Installed the shifter and the NOS 3 speed reverse switch.
It sure was nice to put it through the gears!

[jasonL78]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: jasonL78</div><div class="ubbcode-body">I think I found it. But I dont see the idler pulley. Looks like I will need to talk with the original owner. </div></div>

Well as most of you know this idler pulley was not original to the car. But when it was installed it lined up with the 2nd groove on the water pump and crank pulley for the ac belt. So to me it looked correct. It wasn't until I installed the smog pump I realized the idler was wrong and was installed into the smog pump bolt hole. I have no idea why? So I have located the correct 3 groove AC water pump pulley and should have the correct AC smog pulley this week. I still need the correct diverter valve and bracket for the back of the smog pump. I don't know the part numbers I need? If someone has the correct diverter valve I need I think it is the FG diverter valve and correct bracket please PM me.

Thanks Jason

[MosportGreen66]

Good god Jason... well done!