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Holley 1850 - mechanical secondaries

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Old 04-18-2009, 04:22 PM
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Holley 1850 - mechanical secondaries

I've just picked up an almost brand new Holley 600 carb that I will use to replace my 2150 feedback with, on a basically stock 351W in an 83 F250, for $100NZ (about $56US)
It was on a 327 Chev for 3 months before the engine died.

It has mechanical secondaries - are there any disadvantages with these over vacuum?

Thanks
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Old 04-19-2009, 02:20 AM
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With some googling, I suspect it may not be an 1850, but a 600cfm 4150 double pumper. If so, is this going to be a hungry headache in a basic work-truck?
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Old 04-19-2009, 03:31 AM
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A double pumper will usually burn more fuel than a vacuum secondary which they are designed to do actually, more performance minded than economy. But most economy is in your right foot anyway. If you stand on it with lower rpm's it might bog when the secondaries open too early but if you drive sensible it should work almost as well as a vac carb would.
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Old 04-19-2009, 07:27 PM
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What is the LIST# on the right front of the choke horn in the front?
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Old 04-20-2009, 02:08 AM
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6R 5534 B

All 4 barrels equal dia. - 42mm at a quick measure
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Old 04-20-2009, 04:06 PM
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Can you post a picture of it?
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Old 04-21-2009, 03:12 PM
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Yes, can do so - it might be a day or so
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Old 04-22-2009, 05:16 PM
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Sounds good.
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Old 04-24-2009, 03:01 PM
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6r 5534 b is a 650 cfm double pump carb
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Old 04-25-2009, 10:25 PM
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It doesn't list that number on Holley's site.
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Old 04-26-2009, 05:04 AM
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I couldn't find it either, but it's the correct number.

I'll get the photos & post them tomorrow
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Old 04-30-2009, 07:32 AM
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Finally got them


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Old 05-06-2009, 04:20 AM
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Nailed it down - it is a 650 d/pumper, list is 4777-3. I didn't see that at first.

It would be a good carb for someone - but I'm not so sure about using it on a low rpm - high torque, reasonably heavy, work truck.
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Old 05-06-2009, 04:01 PM
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It is a good carb. An 0-1850 would be a better choice it sounds like though.
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Old 05-06-2009, 05:07 PM
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making sum assumptions, i calc'd out the cfm for the 351...
My assumptions were:
max RPM is 5500
volumetric efficiancy is 85%

With that given, it calc'd out to 475 cfm. The 650 is a little big but it is a good carb. i would try it, if it bogs a tad then try jetting (fuel) it down by 12% and that should put you right in the ballpark of where you need. (if the jet size is 72, multiply 72 times .12+ 8.6 or jet #64)
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