Dear Group,
After several months of patience I received my freshly rebuilt L36 engine from California.(almost $5K!) Regarding this engine I have several questions which I hope any of you could help me out.

The person who performed the engine work installed a fluid damper as per my request, the problem I have now, is that he installed only a single groove crank pulley.

First question:
My car had originally PS and AC, for which I need a double groove crank pulley, right? (one belt drives crank, waterpump,alternator and Power Steering Pump the second belt drives crank, waterpump and the AC compressor, right?)What diameter should this crank pulley be?

Second question:
What water pump size does the 68-70 Big Block Corvettes use, the small or the large water pump?

Third question:
When installing the standard crank pulley to the standard damper, the center bolt holds the pulley attached to the damper as well as the other 3 small bolts, right?

In my case, the center bolt holds only the Fluid Damper to the crankshaft,whereas the 3 small bolts hold the pulley to the damper.

Is there any difference between a Fluid Damper and a Standard Harmonic Damper regarding the width?

Last question:
Should I get a complete pulley set for the engine as well as a new matching waterpump? Where can I get this items? (other than Ecklers)

Any advice is greatly appreciated!

Dan :thumbs:

 

My '68 has a two groove pulley on the crank. It is held on by 3 bolts that attach to the damper. The center bolt attaches the damper to the crank. The inner groove drives only the water pump. There is no idler or other way to adjust tension on this belt. The outer groove drives the power steering pump and water pump.

The power steering pump has two grooves on it's pulley. The inner groove is driven by the crank. The outer groove drives the alternator which is mounted above.

If you have AC, the third pulley on your water pump drives it and your air pump if you have one (you did from the factory but it may be missing).

My water pump is the original pump. I believe the last 3 digits on the housing are 246 (maybe 248).

I can't help you on the fluid damper question as mine is a stock 7" damper.

I hope this helps.

 

I am going thru this pulley configuration thing right now. You may want to check March for a surpentine drive conversion. I don't know if they make one for C3's but it's worth a try.

 

I know nothing of the fluid damper balancers, but with the stock configuration, as others have stated, the pulley is bolted to the damper using the 3 bolts. The center bolt holds the damper to the crank snout.

Look in your AIM.... in the Big Block, PS and the AC sections. You should have a detailed drawing of the correct belt configuration. Chuck

 

I have a Fluidamper on mine.....the pulleys bolt to the unit the same way that they bolt to the factory harmonic balancer....using three bolts.

I agree with Chuckles.....get the AIM if you don't have one....on the other hand, if everyone had an AIM for their ride, then there would be no questions to aks.......Uh....what a revoltig thought that is....

 

:) The reason I suggest to EVERYONE to invest $20.00 for the AIM for their year is that it is indispensible for restoration and reassembly.

Trying to answer some questions about belts, wiring, etc. is like trying to tell somebody how to tie a Windsor knot in their necktie over the telephone. :) Chuck

 

The Windsor know is simple, it's the double Windsor.....

 

Thanks for all feedback on this matter.
I have the 1968 Corvette assembly manual as well as the Haynes Maual for 68-82 vettes. Are there other manuals or books available that you can suggest?

Regarding the pulleys, I found the type of pulley required for this particular fluid damper. It is flat on the damper side and it has a large hole in the center, where the Damper - Crank bolt fits throug. (only supporting the damper with the crank). That was the difference with the original OEM pulley, where the centerbolt supported the pulley and damper to the crank. (additional to the 3 bolts)

Dan

:thumbs:

 

The only one you need is the assembly manual