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Re: 750 DP Part throttle lean
[Re: 500ciBee]
#2763768
04/14/20 10:30 AM
04/14/20 10:30 AM
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Joined: Jan 2003
Posts: 14,491
So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,491
So. Burlington, Vt.
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As far as “850’s” go, the street HP850(82851)is an odd carb.
It’s the only one I can think of that uses the 1.688 baseplate(instead of the 1.750).
It has the big venturi(1.563), but the small baseplate. This is the same configuration as the older “830” carbs.
I was never a big fan of that set up.
The original HP950 is the exact opposite. It has the smaller venturi(1.375) with the big baseplate(1.750).
In any case, since the Street HP850 uses the small baseplate, your Proform body will work on it.
Brawler race series sizes:
67199 650 = 1.250 venturi/1.687 baseplate
67200 750 = 1.390 venturi/1.687 baseplate
67201 850 = 1.390 venturi/1.750 baseplate
67202 950 = 1.450 venturi/1.750 baseplate
There are several configurations of various “850” and “950” carbs utilizing different venturi sizes and baseplates.
They don’t flow the same....... or behave the same.
It’s usually best to reference the physical sizes of the venturi and baseplate when talking “850’s” and “950’s”, to ensure everyone is on the same page with exactly what size carb you’re really talking about.
For example...... a few “950’s”
Holley 80496 - 1.375v x 1.750
Holley 82951 - 1.563v x 1.750
Holley 80805 - 1.600v x 1.750
Brawler 67202 - 1.450v x 1.750
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
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Re: 750 DP Part throttle lean
[Re: fast68plymouth]
#2763802
04/14/20 11:31 AM
04/14/20 11:31 AM
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Joined: May 2005
Posts: 136
Ontario, Canada
500ciBee
OP
member
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OP
member
Joined: May 2005
Posts: 136
Ontario, Canada
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Thanks! I called Holley yesterday to get the same info. They said it would work but didn't provide the amount of info that you just did. I should have asked here first! Do you see any issues with this idea? The carb is a 82851. As far as “850’s” go, the street HP850(82851)is an odd carb.
It’s the only one I can think of that uses the 1.688 baseplate(instead of the 1.750).
It has the big venturi(1.563), but the small baseplate. This is the same configuration as the older “830” carbs.
I was never a big fan of that set up.
The original HP950 is the exact opposite. It has the smaller venturi(1.375) with the big baseplate(1.750).
In any case, since the Street HP850 uses the small baseplate, your Proform body will work on it.
Brawler race series sizes:
67199 650 = 1.250 venturi/1.687 baseplate
67200 750 = 1.390 venturi/1.687 baseplate
67201 850 = 1.390 venturi/1.750 baseplate
67202 950 = 1.450 venturi/1.750 baseplate
There are several configurations of various “850” and “950” carbs utilizing different venturi sizes and baseplates.
They don’t flow the same....... or behave the same.
It’s usually best to reference the physical sizes of the venturi and baseplate when talking “850’s” and “950’s”, to ensure everyone is on the same page with exactly what size carb you’re really talking about.
For example...... a few “950’s”
Holley 80496 - 1.375v x 1.750
Holley 82951 - 1.563v x 1.750
Holley 80805 - 1.600v x 1.750
Brawler 67202 - 1.450v x 1.750
1970 Super Bee prostreet. 383, SMR 727, Dana 60 4:88. Building a 512 low deck.
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Re: 750 DP Part throttle lean
[Re: 500ciBee]
#2763846
04/14/20 12:55 PM
04/14/20 12:55 PM
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Joined: Jan 2003
Posts: 14,491
So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,491
So. Burlington, Vt.
|
Having not used a 82851 myself I can’t say for sure one way or the other.
As long as all the transfer and idle feed holes in the baseplate line up with the ones in Proform body, I don’t see any reason why it wouldn’t work.
Of course there’s no guarantee the Proform body will work any better than the 82851 body.
It might not even work as well on your combo.
But ........ you’ll have both to try.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
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Re: 750 DP Part throttle lean
[Re: fast68plymouth]
#2763863
04/14/20 01:44 PM
04/14/20 01:44 PM
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Joined: May 2005
Posts: 136
Ontario, Canada
500ciBee
OP
member
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OP
member
Joined: May 2005
Posts: 136
Ontario, Canada
|
Thanks! I'm going to take a look at it today. Having not used a 82851 myself I can’t say for sure one way or the other.
As long as all the transfer and idle feed holes in the baseplate line up with the ones in Proform body, I don’t see any reason why it wouldn’t work.
Of course there’s no guarantee the Proform body will work any better than the 82851 body.
It might not even work as well on your combo.
But ........ you’ll have both to try.
1970 Super Bee prostreet. 383, SMR 727, Dana 60 4:88. Building a 512 low deck.
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Re: 750 DP Part throttle lean
[Re: 500ciBee]
#2764169
04/15/20 10:27 AM
04/15/20 10:27 AM
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Joined: May 2005
Posts: 136
Ontario, Canada
500ciBee
OP
member
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OP
member
Joined: May 2005
Posts: 136
Ontario, Canada
|
Here is the result of the 850HP Street with a Proform body. I went with #72 in the primary and #84 in the secondary. The largest PV that I currently have is 6.5 so that’s what’s in there. I’ve got pink cams in the first hole with 30cc pumps and 031 nozzles. What secondary throttle plate opening should I start with? I’ve seen some people take out the secondary throttle adjustment screw and put it in from the top. Will this work? How many turns out from seated should I set the idle mixtures screws to start with?
Thanks again for the help!
1970 Super Bee prostreet. 383, SMR 727, Dana 60 4:88. Building a 512 low deck.
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