Re: Six Pack carb parts
[Re: 4406bbl]
#2608759
01/18/19 09:09 PM
01/18/19 09:09 PM
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Joined: Feb 2006
Posts: 604 TN
1DGEMAN
mopar
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mopar
Joined: Feb 2006
Posts: 604
TN
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[quote=4406bbl]Plates are fine,
Front plate #34 Idle feed .036 Main jet .089-.089
Rear plate #35 Idle feed .036 Main jet .086 right .093 left
Kill bleeds .043
Idle air bleeds .055
High speed bleed.038
Throttle blade hole.078
This is what I found on 3 stock 1970 440 setups, 69s are not the same, 340 is not the same The mopar performance #34, #35 plates match this, some later plates did not match for me, had smaller jets. If this is wrong hopefully someone will correct.
Some have said their promax plates had bigger idle feeds so check to be sure. Match a stock 34 and 35 plate to start.
You seem very knowledgeable about the plates. Do you know what the sizes are on the 340 plates? I had heard that BLP makes the plates and blocks for Pro max true?
Real Men shift for themselves
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Re: Six Pack carb parts
[Re: 1DGEMAN]
#2609405
01/20/19 05:15 PM
01/20/19 05:15 PM
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Joined: Jan 2003
Posts: 1,908 Nebraska
4406bbl
top fuel
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top fuel
Joined: Jan 2003
Posts: 1,908
Nebraska
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[quote=4406bbl]Plates are fine,
Front plate #34 Idle feed .036 Main jet .089-.089
Rear plate #35 Idle feed .036 Main jet .086 right .093 left
Kill bleeds .043
Idle air bleeds .055
High speed bleed.038
Throttle blade hole.078
This is what I found on 3 stock 1970 440 setups, 69s are not the same, 340 is not the same The mopar performance #34, #35 plates match this, some later plates did not match for me, had smaller jets. If this is wrong hopefully someone will correct.
Some have said their promax plates had bigger idle feeds so check to be sure. Match a stock 34 and 35 plate to start.
You seem very knowledgeable about the plates. Do you know what the sizes are on the 340 plates? I had heard that BLP makes the plates and blocks for Pro max true? Sorry I do not know much, just wish those that do know would post the exact stock orifice sizes for the 340 and 440 setup, that way a person would know what they have. It gets a little old seeing people post, oh just return it all to stock size and start there, what is truly stock size? I am pretty sure my 440 specs are correct as I have not been corrected, usually if you post something wrong here you will find out fast. The #34 and #35 plates that you buy from holley now are wrong, or the catalog specs are wrongfor a 6bbl. For the 340 I have little info, #41 plates, .067 kill bleeds. Holley catalog says #41 plate is .033 idle bleed, and .070 main jet....I doubt thats correct for a 6bbl. I sold the 340 stuff off years ago, if I had one I would tear it down and give you the info. Maybe someone that has a 340 that runs right could post what they have next time it is apart.
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Re: Six Pack carb parts
[Re: 4406bbl]
#2634620
03/19/19 10:07 PM
03/19/19 10:07 PM
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Joined: May 2012
Posts: 1,820 South Bend
John Brown
top fuel
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top fuel
Joined: May 2012
Posts: 1,820
South Bend
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[quote=4406bbl]Plates are fine,
Front plate #34 Idle feed .036 Main jet .089-.089
Rear plate #35 Idle feed .036 Main jet .086 right .093 left
Kill bleeds .043
Idle air bleeds .055
High speed bleed.038
Throttle blade hole.078
This is what I found on 3 stock 1970 440 setups, 69s are not the same, 340 is not the same The mopar performance #34, #35 plates match this, some later plates did not match for me, had smaller jets. If this is wrong hopefully someone will correct.
Some have said their promax plates had bigger idle feeds so check to be sure. Match a stock 34 and 35 plate to start.
You seem very knowledgeable about the plates. Do you know what the sizes are on the 340 plates? I had heard that BLP makes the plates and blocks for Pro max true? Sorry I do not know much, just wish those that do know would post the exact stock orifice sizes for the 340 and 440 setup, that way a person would know what they have. It gets a little old seeing people post, oh just return it all to stock size and start there, what is truly stock size? I am pretty sure my 440 specs are correct as I have not been corrected, usually if you post something wrong here you will find out fast. The #34 and #35 plates that you buy from holley now are wrong, or the catalog specs are wrongfor a 6bbl. For the 340 I have little info, #41 plates, .067 kill bleeds. Holley catalog says #41 plate is .033 idle bleed, and .070 main jet....I doubt thats correct for a 6bbl. I sold the 340 stuff off years ago, if I had one I would tear it down and give you the info. Maybe someone that has a 340 that runs right could post what they have next time it is apart. I believe some of my Holley catalogues have the specs for the metering plates. I'll dig them out tomorrow and see what I find.
July 19th should be "Drive Like Rockford Day". R.I.P. Jimmie.
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Re: Six Pack carb parts
[Re: John Brown]
#2638006
03/28/19 10:06 AM
03/28/19 10:06 AM
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Joined: May 2012
Posts: 1,820 South Bend
John Brown
top fuel
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top fuel
Joined: May 2012
Posts: 1,820
South Bend
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Here's what my old Holley catalogues have comparing plate numbers to idle restrictions and jet sizes.
July 19th should be "Drive Like Rockford Day". R.I.P. Jimmie.
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Re: Six Pack carb parts
[Re: jlatessa]
#2652253
05/05/19 01:23 PM
05/05/19 01:23 PM
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Joined: Jan 2003
Posts: 9,436 Blair County,PA
62maxwgn
master
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master
Joined: Jan 2003
Posts: 9,436
Blair County,PA
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As an original owner of an A12, if my memory (I'm 77) serves me right, when I tried to improve the bad idle characteristics, the screws were barely, if at all, off the seats.
The best results were 1/8 or a 1/4 turn off the seat.
Joe I just finished two sets of A12 carbs,one for a member here and the other a member on the A12 site that still had the original lead plugs,both sets were out exactly two turns except the driver side front left on the one set and it was 1 3/4 turns out.
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Re: Six Pack carb parts
[Re: sogtx]
#3126152
03/03/23 12:09 PM
03/03/23 12:09 PM
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Joined: Oct 2007
Posts: 734 New York
R/T1968R/T
super stock
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super stock
Joined: Oct 2007
Posts: 734
New York
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You can actually modify the stock metering plates to accept jets. Plug the orifices with lead and drill and tap for jets.
Last edited by R/T1968R/T; 03/03/23 12:11 PM.
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Re: Six Pack carb parts
[Re: formula S]
#3131329
03/22/23 08:17 AM
03/22/23 08:17 AM
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Joined: Dec 2018
Posts: 88 IL
83hurstguy
member
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member
Joined: Dec 2018
Posts: 88
IL
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Has anyone here had any problems with the floats hitting the plates? I have... I never figured out the root cause of the issue other than float and bowl tolerance stack up. Some of the float designs were slightly closer to the plate than others. We had to file down the parting line on a nitrophyl float on the dyno to finish the day.
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Re: Six Pack carb parts
[Re: jlatessa]
#3131595
03/22/23 11:40 PM
03/22/23 11:40 PM
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Joined: Aug 2003
Posts: 43,127 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,127
Bend,OR USA
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[quote=jlatess The best results were 1/8 or a 1/4 turn off the seat.Joe [/quote]
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Six Pack carb parts
[Re: RoadRunnerJD]
#3143237
05/08/23 05:22 PM
05/08/23 05:22 PM
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Joined: Jul 2011
Posts: 955 Chicago
PurpleBeeper
super stock
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super stock
Joined: Jul 2011
Posts: 955
Chicago
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I'm running the Promax plates in my outboards. I think my '70 carbs uses a 34 & a 35 plate and I couldn't find one of them (one is common, the other isn't) & my plates had been drilled. I was trying to get back to "factory settings". After extensive research, I put in jets that matched the stock metering plate holes AND changed out the secondary idle feed restrictions. I had to call Promax to get the idle feel restrictors (not on their website) and they had some the correct size (pretty cheap, but I did have to put a propane torch on one to get it out)
70 Roadrunner convt. street car
440+6, NOS, 4-spd, SS springs
'96 Mustang GT convt. street car
'04 4.6 SOHC, NOS, auto, lowered
"Officer, that button is for short on-ramps"
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