Holley Street Demon 625
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Car: 86 Trans am
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Holley Street Demon 625
I'm fed up with trying to get my Computer controlled Quadrajet to work properly, so i was looking into replacing it for a traditional carb and vacuum advanced distributor. I came across the now made by Holley Demon street demon 625cfm model 1900 carb. It looks to have both square and spread bore holes so i can just keep my factory manifold. Anyone have experience with running these in a third gen? Should i go that route or look at an adapter plate and out an edelbrock performer carb on?
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Car: Resto-Mod 1987 IROC-Z Clone
Engine: Alky fed L92 Vortec Twin-Turbo 6.8L
Transmission: My own built/ design 4L80M
Axle/Gears: Custom 12 bolt (4.10:1)
Re: Holley Street Demon 625
I have had fitment/ clearance issues with those AFB-Style Demon Carburetors...
when the Spread-Bore Intake Manifold has a WIDE Center-Divider that is tall enough to be even with the Carb Mounting-Pad.
The Design in the Image below, will work with the Demon Carb:
The Image Below (Most Stock Designs) will not fit:
when the Spread-Bore Intake Manifold has a WIDE Center-Divider that is tall enough to be even with the Carb Mounting-Pad.
The Design in the Image below, will work with the Demon Carb:
The Image Below (Most Stock Designs) will not fit:
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Car: Resto-Mod 1987 IROC-Z Clone
Engine: Alky fed L92 Vortec Twin-Turbo 6.8L
Transmission: My own built/ design 4L80M
Axle/Gears: Custom 12 bolt (4.10:1)
Re: Holley Street Demon 625
You should be able to use an Adapter/ Carb-Spacer that will allow the Demon the install on the Intake-Manifold.
It would not be ideal for Performance purposes...
I would contact Holley (regarding an Adapter for the Demon Carb to fit the Spead-Bore Intake-manifold) to be certain.
It would not be ideal for Performance purposes...
I would contact Holley (regarding an Adapter for the Demon Carb to fit the Spead-Bore Intake-manifold) to be certain.
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Car: 86 Trans am
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Axle/Gears: 3.27 9 bolt posi
Re: Holley Street Demon 625
Yea I'm really thinking about just getting a new intake manifold, question then is do I stick with the demon or get an edelbrock 1406
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Car: Resto-Mod 1987 IROC-Z Clone
Engine: Alky fed L92 Vortec Twin-Turbo 6.8L
Transmission: My own built/ design 4L80M
Axle/Gears: Custom 12 bolt (4.10:1)
Re: Holley Street Demon 625
Personally... I would not matter much to me.
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Car: 86 Trans am
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Re: Holley Street Demon 625
Ok next question, what should I do about the change in fuel lines. I know the factory fuel line will not work. What size is the line the threads into the mechanical fuel pump
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