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Holley Carb Gurus-Help Needed
#1002315
05/29/11 08:16 PM
05/29/11 08:16 PM
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Joined: May 2007
Posts: 1,675
Mi.
G-Money1320
OP
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OP
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Joined: May 2007
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Mi.
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A friend of mine hooked me up with a 750 double pumper and I need a little advice as to where to start with it. First it has 32 shot in the front and 42 in the back, with 82 jets in the front and 71's in the back. Now I know this probably is way off for my application so what would be a good base to start with?? Im switching from a 750 vacuum secondary that has a 25 shot with I believe 72 jets. Im running a good 340/auto,3.73 gears in a 3100# 69 Dart. Also shouldnt the idle adjustments be in the front metering block? They are in the rear block?? Im not good with carbs so I would appreciate some advice. Thanks1
416 stroker from Nick at Compu-flow. 11.14 in full street trim. Seems like a new best every time out.
11.06 open headers----so far!!
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Re: Holley Carb Gurus-Help Needed
[Re: G-Money1320]
#1002316
05/29/11 08:25 PM
05/29/11 08:25 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Go to the Holley web site and set it up back to standard... you gonna need the numbers off the carb.... yes the primaries are in the front... thats the idle plate... you sure you dont have it turned around backward... because the jetting is backwards also 
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Re: Holley Carb Gurus-Help Needed
[Re: G-Money1320]
#1002319
05/29/11 08:39 PM
05/29/11 08:39 PM
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Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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Quote:
I put new gaskets and diaphrams on it today and while I was assembling it I noticed the blocks didnt look right, thats why I asked just in case, but the front one has the power valve in it-im so confused,   The way I took it apart and reassembled it was the way I got it. Hi Mike
I would install 31 squirters front & rear, 42 will be too much. You can get away with the 32 out back, just install a 31 up front. you can get away with the 71/82 jets for now.
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Re: Holley Carb Gurus-Help Needed
[Re: G-Money1320]
#1002320
05/29/11 09:00 PM
05/29/11 09:00 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
I put new gaskets and diaphrams on it today and while I was assembling it I noticed the blocks didnt look right, thats why I asked just in case, but the front one has the power valve in it-im so confused, The way I took it apart and reassembled it was the way I got it. Hi Mike
Take it back apart... throttle linkage is on the left
(drivers side)... idle metering block goes in front
and so should the PV if running one... if using the
PV you will be about 8 jet sizes smaller on the front
than the rear... no PV in the rear... I tried to
pull up the specs for the different 750DP but the
Holley site isnt working right now
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Re: Holley Carb Gurus-Help Needed
[Re: MR_P_BODY]
#1002321
05/29/11 09:43 PM
05/29/11 09:43 PM
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Joined: Jun 2007
Posts: 2,646
Plymouth Meeting, PA
bigtimeauto
Trophy Winner
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Trophy Winner
Joined: Jun 2007
Posts: 2,646
Plymouth Meeting, PA
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You didn't post your list number so here are all of the specs for 750's i have: (all powervalves are in the front)
4779 c 750 (F)75,(R)76 8.5 4150
4779-1 750 (F)70,(R)80 8.5 4150
4779-2 750 (F)70,(R)80 6.5 4150
4779-3 750 (F)70,(R)73 6.5 4150
4779-4 750 (F)70,(R)80 6.5 4150
4779-5 750 (F)70,(R)80 6.5 4150
4779-6 750 (F)71,(R)80 6.5 4150
BB, TT5,Procharged 3300lb Street Car 4.79/154
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Re: Holley Carb Gurus-Help Needed
[Re: bigtimeauto]
#1002322
05/29/11 10:09 PM
05/29/11 10:09 PM
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Joined: May 2007
Posts: 1,675
Mi.
G-Money1320
OP
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OP
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Joined: May 2007
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Mi.
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Well theres no choke horn on it to get the numbers from it, on the base it had 47708 and I just went out and took it apart again to verify the blocks are on right and now im even more baffled. The front block is indeed on right as it has the PV but no idle screws or even tapped for them, and the back block had the screws but not drilled for the PV.
416 stroker from Nick at Compu-flow. 11.14 in full street trim. Seems like a new best every time out.
11.06 open headers----so far!!
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Re: Holley Carb Gurus-Help Needed
[Re: bigtimeauto]
#1002324
05/29/11 10:18 PM
05/29/11 10:18 PM
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Joined: Jun 2007
Posts: 2,646
Plymouth Meeting, PA
bigtimeauto
Trophy Winner
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Trophy Winner
Joined: Jun 2007
Posts: 2,646
Plymouth Meeting, PA
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I missed the suirter question. most early ones with the small pumps used 25's and 28's the -1 and -2's used 28 and 31
BB, TT5,Procharged 3300lb Street Car 4.79/154
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Re: Holley Carb Gurus-Help Needed
[Re: bigtimeauto]
#1002325
05/29/11 10:19 PM
05/29/11 10:19 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
Well theres no choke horn on it to get the numbers from it, on the base it had 47708 and I just went out and took it apart again to verify the blocks are on right and now im even more baffled. The front block is indeed on right as it has the PV but no idle screws or even tapped for them, and the back block had the screws but not drilled for the PV.
hmmm sounds like it was thrown togehter with mismatched parts. Might be better to move on if you don't know about carbs.
Oh and rear blocks did come with powervalve holes but were plugged on some carbs.
Yep, sounds like a mix and match pile of parts...
you dont need the PV in the front BUT you do want the
mixture screws in the front.... the PV will help when
cruising
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Re: Holley Carb Gurus-Help Needed
[Re: MR_P_BODY]
#1002328
05/29/11 11:46 PM
05/29/11 11:46 PM
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Joined: Feb 2005
Posts: 5,221
Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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If you can find a metering block with the idle screws & a PV provision you'll be good, then stick the one with no idle screws in back, You need to find a metering block off a DPer or at least a 3310 750, the 600 1850 will be too small for the metering, If you feel you don't want to tread in this area, just get another carb (preferably new) & move on.
Last edited by joedust451; 05/29/11 11:48 PM.
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Re: Holley Carb Gurus-Help Needed
[Re: MR_P_BODY]
#1002329
05/29/11 11:49 PM
05/29/11 11:49 PM
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Joined: May 2007
Posts: 1,675
Mi.
G-Money1320
OP
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OP
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Joined: May 2007
Posts: 1,675
Mi.
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If this is a mix-matched carb, then why does the front have a PV and not the idle screws? I can understand the rear having them since it could have been a 4 corner idle carb. I do have a 650DP I could take the block from.
416 stroker from Nick at Compu-flow. 11.14 in full street trim. Seems like a new best every time out.
11.06 open headers----so far!!
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Re: Holley Carb Gurus-Help Needed
[Re: bigtimeauto]
#1002331
05/29/11 11:53 PM
05/29/11 11:53 PM
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Joined: May 2007
Posts: 1,675
Mi.
G-Money1320
OP
top fuel
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OP
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Joined: May 2007
Posts: 1,675
Mi.
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Do the rears have PV's also?
416 stroker from Nick at Compu-flow. 11.14 in full street trim. Seems like a new best every time out.
11.06 open headers----so far!!
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Guess I should have stayed in school longer 