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Intake manifold change? Advantages?

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Old 04-08-2004, 06:16 PM
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schardt_greg
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Default Intake manifold change? Advantages?

Hey-

I was looking into getting a different intake manifold. I currently have a stock ford manifold that came with the mustang ('65, 289) and wanted to upgrade to an edelbrock dual intake. I currently have a 650 cfm holley on the car, but other than some nice valve covers, a K&N and chrome dress up kit, nothing else. Is an intake the first thing I should get to juice up the engine? I dont want to spend a lot of money, but I need to add some power. And which intake?

Also, I've noticed something lately with my car. When I totally floor it, it does nothing, it acts like it is flooded. If I gradually slam on it, gradually, it lets out. I adjusted the carb so that it kicks down the transmission faster when floored and seems to open up the back 2 venturis of the carb more, but what else may be wrong?

Thanks-

Greg Schardt
'65 hipo 289 4v fastback
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Old 04-11-2004, 12:30 AM
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Acer2428
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Default RE: Intake manifold change? Advantages?

Air restirction? Seems like if you give it gas and it doesn't you go you're missing 1/2 of the equation.

Maybe a new intake and or manifold would help? Sorry not an expert, just pondering.
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Old 04-11-2004, 01:43 AM
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roundman
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Default RE: Intake manifold change? Advantages?

the 650 cfm Holley is a bit big for a stock 289 engine. when you open up quickly, you get so much air the engine bogs because you arent' getting enough fuel with the air. check to make sure the accelerator pumps on the carb are working. try increasing the stroke on the accelerator pumps and/or increasing the size of the squirters from the accel pumps to dump in more fuel with the air. there is a link off the throttle linkage that can be moved in the accelerator pump lever arm to increase the volume of the pump stroke. you can also get bigger accelerator pumps too. if you have vacuum secondaries, you can delay their opening some by changing the spring in the vacuum canister that operates them.
as for your other question, I would install headers first and then think about a new intake later. If you do go with headers, you might have to change the carb jets and richen up the mixture a bit as headers are so much more efficient than stock exhaust manifolds that the engine will run lean if you don't richen it up some.
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Old 04-11-2004, 01:50 AM
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Acer2428
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Default RE: Intake manifold change? Advantages?

Hehe... for some reason I knew I was wrong.

Roundman does it again!
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