I am installing a cowl induction hood on my 70 Chevelle. I bought an aftermarket kit that comes with all the parts to mount the flapper door. When hooked up the door is always open and it looks as if the door will close under engine vacuum. This doesn't seem right to me, seems like it should be the other way around.

Anyone else use the aftermarket setup, any ideas on if I might be doing something wrong??

Anybody have any pics of what it should look like when installed?? (closeups, and pics of underhood brackets.)

Thanks a bunch,

Grooves12

The outer door (the one the appears on top of the hood) is supposed to be open when the engine isn't running. I does use engine vacuum to pull it closed when the engine is running. Then when you floor it the vacuum drops and the door opens. There is a vacuum actuator that activates the door. It is feed by a hose that comes from the intake manifold that passes through another small vacuum reducer.

There is also an inner door that is electricly activated by a switch that is below the throttle pedal. It opens up when the throttle is put to the floor.

(some people choose to leave this door out)

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Dave Knapp
TC #388
ACES # 3474
'70 SS 396 (http://www.chevelles.com/showroom/DaveK1.jpg)
L34 (http://www.chevelles.com/showroom/DaveK2.jpg)

Thanks...

You mention a vacuum reducer... this goes between the manifold and the vacuum pod that actually connects to the door??

Is it necessary?? Where can I get one??

Grooves12

Is there any advantage of having the inner solenoid-activated door installed?? Such as blocking out debris or anything like that. Because I was thinking of just leaving it out also.

Where might I be able to get the spacers that go in between the door support brackets and the hood?? It doesnt look like they are reproduced as of yet.

Yes, The vacuum reducer (called a cowl induction check valve) goes in the hose line between the manifold and the vaccuum acutator. It's main purpose is to slow the closing of the outer door so it doesn't slam shut. Our sponsor Ground Up carries them and the Hod door attaching kit which has the nylon bushings I think your looking for.

I don't believe it'll hurt a thing leaving the inner door out. A lot of people do so the engine is pulling cool air all the time.

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Dave Knapp
TC #388
ACES # 3474
'70 SS 396 (http://www.chevelles.com/showroom/DaveK1.jpg)
L34 (http://www.chevelles.com/showroom/DaveK2.jpg)

The spacers you mention are not available anywhere. You have to use washers for spacers. Be very careful when tightening the bolts, if they are too long, you will push up a bump(s) on the outside hood. And how do I know?

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Tom Parsons