carb selection - 460 Ford Forum
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post #1 of 13 (permalink) Old 10-02-2018, 08:46 PM Thread Starter
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carb selection

getting ready to send my engine to the shop to be dynoed, I need to figure out what carb would be best and was hoping to get some expert opinions. its a 9.9 to 1 521ci with fully ported D0VE heads and torker II intake. The engine is going in a 2wd 79 f350 with a c6 auto, would a vacuum secondary carb be better than mechanical? Also I was thinking a choke would be nice since I will drive it occasionally in the winter. I was looking at the quickfuel ss-880-vs, is that enough carb for my application?
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post #2 of 13 (permalink) Old 10-03-2018, 04:03 AM
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If you go mechanical the APD carbs are hard to beat IMO, throttle response is amazing and they build it to suit your engine.

Cheers, Bob
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post #3 of 13 (permalink) Old 10-03-2018, 11:51 AM
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Cool

Given the modest cam timing. Gee that looks familiar

850 cfm is more than adequate. If you are running a bit of stall a mechanical secondary carb is fine.

Vac secondary carbs with choke and proper secondary tuning are good as well.




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post #4 of 13 (permalink) Old 10-03-2018, 12:21 PM Thread Starter
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yeah scotty its taken a lot longer than id hoped to get this thing finished but every time i think ive got the money to finish it something more important comes up. im not sure what converter to run, is it best to put it on a dyno before choosing a converter? its just mainly going to be a street cruiser, i think it weighs between 4500 and 5000lb.
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post #5 of 13 (permalink) Old 10-03-2018, 02:00 PM
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Every VS carb I've dyno'd has been down on power relative to a DP. That said, VS can and do work well on the street.


Stall speed in a street application is more a function of gearing and conditions. You want to keep the stall speed lower than your cruising rpm.




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post #6 of 13 (permalink) Old 10-03-2018, 02:08 PM
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Cool

Carl makes a good point about the mechanical vs. vac carbs which I was too lazy to address.

Shoot me an email with dyno numbers, gearing and tire height etc. I am direct with transtar daaco and can source a reasonably priced converter. Glad to see it coming together.


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post #7 of 13 (permalink) Old 01-18-2019, 06:11 PM Thread Starter
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Finally got it running, i went with a quickfuel sq850 carb. Made [email protected] and [email protected] Didnt do a whole lot of fine tuning but im pretty happy with it.
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post #8 of 13 (permalink) Old 01-18-2019, 06:13 PM Thread Starter
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Heres the dyno sheets
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post #9 of 13 (permalink) Old 01-18-2019, 08:43 PM
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Cool

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Originally Posted by akhighboy View Post
Heres the dyno sheets

Try 34* total timing. You are tossing away about 25+ hp there.



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post #10 of 13 (permalink) Old 01-18-2019, 08:47 PM Thread Starter
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Ok, ill try that once its in the truck we ran out of time on the dyno because they had some issues with some of their equipment. I also havent recurved the distributor, its as it came from msd out of the box.
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post #11 of 13 (permalink) Old 01-19-2019, 01:51 PM
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Cool

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Ok, ill try that once its in the truck we ran out of time on the dyno because they had some issues with some of their equipment. I also havent recurved the distributor, its as it came from msd out of the box.

As delivered the MSD distributor has a very lazy curve.

Install the black bushing, use one light silver and one light blue spring and set total timing to 34 / 35* at 3000 rpm.

The increase in power will be notable...



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post #12 of 13 (permalink) Old 01-19-2019, 02:10 PM Thread Starter
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Thanks scotty, i will definitely do that.
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post #13 of 13 (permalink) Old 05-17-2019, 08:39 PM Thread Starter
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So I've got about 500 miles of normal driving on the truck and it runs great. I figured I'd pull a plug just for the heck of it to see what it looks like, I'm a little lost on how to read plugs. I've read that unleaded gas doesnt really show color like leaded gas did, does this look ok or do I need to change something?
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