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Old 10-12-2010, 10:57 AM
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New to SBC V8 - Vacuum / Electrical

Hi everyone. I'm new to the board. My name is david-b, and have been involved in the import scene for just over 6 years. I've rebuilt my fair-share of motors (all 4 cyl), been at the drag strip and numerous AuotX events. I ended up parting out my project Eagle Talon ESi-T after I got tired with the whole car mechanics, and then found a great deal on a 75 Monte Carlo with a SBC 400. The motor was already pulled and torn down to the block and had quite a few performance parts included in the purchase, that included a high rise intake, aluminum heads, dual timing chain (not sure if that's the proper name), a cam, a Demon double pumper 4bbl, and much more.

I've been putting it all back together and it's coming a long pretty smoothly. I've got the heads on and will be adjusting the valves tonight. The body is almost ready to get the motor dropped back in.

The previous owner just cut the wires so there's no connectors on most of them. I'm pretty happy that there's much fewer wires on these than there are especially when wiring standalone ECUs such as MegaSquirt, so it should go pretty smoothly. However, does anyone have a wiring diagram for this car? Been searching all over with no luck.

Lastly, I'm trying to find a diagram for vacuum lines. I have no clue on where the line from the distributor goes to and many others. Again, everything was just cut at time of removal, so it's like starting from scratch. Are there any diagrams or pics that people have to show me? The intake has much fewer places for vacuum that the stocker did (still have all stock parts as well) so not really sure where everything goes.

I appreciate any help and look forward to posting more here.

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Old 10-12-2010, 11:54 PM
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The Vacuum line from Distributor can go to Full or Ported Vac connection on Intake or bottom of Carb. Large Cams usually like full Vac to Distr. Helps with idle with Cams that have alot of Duration.

I posted a few Wiring diagrams here for G-Bodies >> Ignition wiring for g-body Cutlass on last Post.
Autozone & Advance have alot of wiring & Vac diagrams also.
Todd
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Old 10-13-2010, 07:05 AM
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Quote:
Originally Posted by SSedan64
The Vacuum line from Distributor can go to Full or Ported Vac connection on Intake or bottom of Carb. Large Cams usually like full Vac to Distr. Helps with idle with Cams that have alot of Duration.

I posted a few Wiring diagrams here for G-Bodies >> Ignition wiring for g-body Cutlass on last Post.
Autozone & Advance have alot of wiring & Vac diagrams also.
Todd
Thanks for the response. Those diagrams should get me on a good start. Every AutoZone I've been to has been nothing less than useless, and never able to find what I need. I have the Haynes manual, but not too much with vacuum lines in there.

I have a heater question now. I would ideally like to keep the AC and heater fully functional. I read that the little vacuum piece that comes off the stock IM basically 'turns on' the flow of coolant to the heater core. I've read that some people keep that off and just run a line to the core. Mine is impossible to get off the stock IM at the moment, and was thinking of just replacing it with a SS fitting and line. Any pros/cons of that?
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