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Old 04-24-2010, 10:59 AM
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Fuel pressure?

Hey guys! Remember when i was looking for a carb? Well... I found a guy that had a brand new Holley 750 DB that came with a proform main body. Its pretty much brand new and almost no use! Anyway, im about to put it on my 383 and tune it with a vacuum gauge, but i have a question first. How much fuel pressure are the holley 750's most comfortable with?

My edelbrock i had at about 3.5 to 4 psi. I still have a fuel injection pump and im using 2 fuel regulators to drop the psi down enough for a carb. I can bring it up to 9 if i just use the main regulator. So im just wanting to know whats the sweet spot to run at.

Last question.. What do you call the screw that goes into the carb for the air cleaner? I need one for the holley, the one that fits the edelbrock is to small. Where can i get one.. the hardware store? thanks!

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Old 04-24-2010, 11:10 AM
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i believe the air cleaner post/stud is just 1/4"X20 thread. you should beable to get that at any hardware store and cut to length.
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Old 04-24-2010, 11:21 AM
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You may get varied answers to this but most street setups stay around 5 psi or under. I would try it at where you have it and see how it runs. The longer threaded air cleaner hold down rod can be purchased at most parts stores or you may be able to find it at a hardware store, it's called "allthread" by them.
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Old 04-24-2010, 06:13 PM
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whats the next thread size up from 1/4? i bought that and its a slight bit too small. Also the double pumper will not fit on my performer rpm if i have the manifold port used so i must buy a plug and plug it off. if i put a tee from the manifold port off the carb and run pvc and brake booster off of the tee, will this work well? I dont see why not, but ive never done it so i thought i would check.
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Old 04-24-2010, 06:23 PM
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1/4-5/16-3/8-7/16 and so on.


Cole
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Old 04-24-2010, 06:25 PM
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Air cleaner stud size on the Proform body and the Holley HP series is larger than the old Holley size, as you have found. The HP size is 5/16"-18 NC thread. I make them out of 5/16" allthread commonly available at hardware stores.
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Old 04-24-2010, 06:28 PM
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Thats what i do also i use all-thread rod to make mine. And i agree you shouldn't need more then 5 psi fuel pressure also.


Cole
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Old 04-24-2010, 10:08 PM
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It was a 5/16. Went to lowes and bought a 6 inch for about 80 cents. They sold wingnuts and they gave me the one to fit it for free.. that was awesome. On the eddy intake, the brake booster port will not fit under the carb so i guess ill just plug it. A guy from autozone is giving me one tomorrow because the store dosent sell them. Thanks for the help.
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Old 04-25-2010, 01:57 PM
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Quote:
Originally Posted by stroker444
whats the next thread size up from 1/4? i bought that and its a slight bit too small. Also the double pumper will not fit on my performer rpm if i have the manifold port used so i must buy a plug and plug it off. if i put a tee from the manifold port off the carb and run pvc and brake booster off of the tee, will this work well? I dont see why not, but ive never done it so i thought i would check.
You do not want to run the PCV off of the manifold. Use the port on the carb, that's what it's for. You can get real low profile 90deg fittings,Summit, Jeg's,etc, that will work for your brake booster. I have the same intake, with a Holley 650HP DP, and got a low profile fitting to clear the fuel bowl, for my booster line.
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