Anyone have any idea what Holley carb (new) would be best for a 534? The Holley website suggests a vacuum secondary 570, but the calculator only asks the cubic inches and rpm of the engine. I'm wondering if a 534 being the beast that it is has different needs than a "normal" motor. Its got a vacuum secondary 3310-2 750 on it now and runs poorly, starts hard, and uses a disgraceful amount of fuel. Time to throw some money at it and buy my way out of a recurring headache. Hopefully one of you guys has the answer!!
Regards,
Mike Haworth
I think the 750 cfm is way too big. I took off a 370 cfm vacuum secondary Holley from a 477 (which I modified to use on a 260 small block). This carb had the idle circuit on the secondaries, an accelerator pump on both sides and of course the governor.
Is there any particular reason you want a new carburetor and not a good used one?
Thx again Beanscoot! Been a while since I visited this forum. I talked to the factory techs at Holley. The guy described the symtoms exactly and seemed sure that a 570 street avenger would make a huge difference. Youre right, a 750 was way too big, ie: too much flow for that motor. My mech ability is too limited to try and tweak or diagnose a carb that may have been modified and isnt performing quite right, so in order to save future headaches I went ahead and bought the new 570 which came with a really great dvd on adjustment. I get a week vacation Feb. 5 and will be rebuilding the fuel system from tank to intake. Hoping for the best!! will post results.
Regards,
MIke
Hi Mike,
The new carburetor should save you a lot of trouble. I have to correct my last post. Where I wrote "an accelerator pump on both sides" I should have said "a power valve on both sides". Of course there's only one accelerator pump but two power valves in these old governed carburetors.
Even if you aren't too experienced with carburetors, I would think you could do alright in rebuilding one if you just take lots of care. Most problems are simple ones, like dirt in a main jet, a torn or hardened power valve etc. Supposedly these old SD carbs use different gaskets, but I seem to recall that I got a couple from the stock at the local speed shop years ago when I repaired mine.
I just replace the gaskets that get torn and parts that are faulty, I don't bother with the expensive kits since the needle and seat assemblies and such seem to last forever for me. I rub never-seize on the bowl gaskets to help keep them from sticking and shredding next time the bowls or metering blocks are removed.
I'm hoping it works out good.. Supposed to have "next generation" power valves. -whatever that means. At least parts are readily available. Its supposed to be wet tested at the factory, and you just set the float level and idle and away you go. LOL We'll see.. it did come with a really great dvd for troubleshooting and adjustment, and is all polished and shiny!!! HAHA. If this works I may have to get some more sexy looking parts to dress up the old bitch!
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Holley carb selection
