High idle, no idle-vacuum.

Jim Jones · Sep 23, 2017

Bluzilla said: ↑

I just went through this with another board member from Chicago's '70 GSX ported cast iron intake and he ended up finding a vacuum leak caused by a missing bolt/plug on the top-front-right side of the 2-4 intake runners .... closer to the outside where the wiring harness runs. I know this should be plugged when the runner there is opened up enough to break into the threaded portion there, but I missed checking for it. The car came to me with open headers so not much to hear except the thunder in my shop. The heater hose was laying directly on top of the open hole, .....not an excuse, I know better and should have caught it. I'm not positive but I've seen that location used for a heater hose bracket. I know the owner had the plenum divider removed and port matched. I just checked another customers ported TA intake and sure enough it's also broken through (pictures). Just something worth everyone checking, especially those using tall ports.

Larry
Click to expand...

My ported cast iron intake broke through there as well. Quite common, but can be easily overlooked.

Bluzilla · Sep 23, 2017

Jim Jones said: ↑

My ported cast iron intake broke through there as well. Quite common, but can be easily overlooked.
Click to expand...

The next BBB core engine I get in with a cast iron intake I think I'll sonic test that area, .... just for reference and curiosity.

Larry

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High idle, no idle-vacuum.

Jim Jones Wretched Excess

Bluzilla a.k.a. "THE DOCTOR"

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