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Author Topic:   Holley 6425 2brl Problems ! Help !
ddoti1
Member
posted May 30, 2002 07:54 PM
I ve been running a 2jet Rodchester (625 cfm)
from a carb shop switched to a 6425 Holley (650cfm) and the car wouldn t run but 5000 rpms and it seemed to use 3 times the fuel !
After taking it off I noticed it had 75 jets and a 6.5 power valve in it I had good fuel pressure and the float seemed to be set properly, but this carb just seems like it won t run like it should ! HELP ! Any professionals here ? I m open to all suggestions !


KPLugnut
Member
posted May 31, 2002 08:50 AM
Exactly what kind of car/motor are ya running that carb on? jetting/PV settings all vary greatly based on what motor the carb is on top of.
Give us more info, and we'll be glad to assist.

KPLugnut

ddoti1
Member
posted May 31, 2002 08:59 AM
quote:
Originally posted by KPLugnut:
Exactly what kind of car/motor are ya running that carb on? jetting/PV settings all vary greatly based on what motor the carb is on top of.
Give us more info, and we'll be glad to assist.

KPLugnut


Thanks !
84 Monte Carlo ( Bomber ) 355 cu in - 3spd sag trans - Ford 9 in - 10 inches of Vac @ idle ! Jets 66 ( I was wrong ) Powervalve in Carb is 65 ! And beleive me its a dog !


KPLugnut
Member
posted May 31, 2002 10:42 AM
Sounds like the carb is jetted wrong (I've never used jets that small in that carb, fwiw), and possibly it has other "issues".
Some of those aerosol-style venturi carbs were very poor in performance, contrary to what many guys think.
The power valve shouldn't be your main concern, a 6.5 should be fine for starters.
I'd honestly have to see the carb and go thru it to find out why it's not performing for you. Possibly something as simple as the use of an incorrect gasket (metering block, throttle body, etc.) could ruin a carb's performance as well.
The metering block could have some plugged circuits, too.

If you're sure everything is right, and have blown out all the circuits, bleeds, etc. then the only thing I can suggest is we'd be glad to look at it for you and find the source of the problem.

KPLugnut

ddoti1
Member
posted May 31, 2002 10:56 AM
quote:
Originally posted by KPLugnut:
Sounds like the carb is jetted wrong (I've never used jets that small in that carb, fwiw), and possibly it has other "issues".
Some of those aerosol-style venturi carbs were very poor in performance, contrary to what many guys think.
The power valve shouldn't be your main concern, a 6.5 should be fine for starters.
I'd honestly have to see the carb and go thru it to find out why it's not performing for you. Possibly something as simple as the use of an incorrect gasket (metering block, throttle body, etc.) could ruin a carb's performance as well.
The metering block could have some plugged circuits, too.

If you're sure everything is right, and have blown out all the circuits, bleeds, etc. then the only thing I can suggest is we'd be glad to look at it for you and find the source of the problem.

KPLugnut


Ok I m game give me some ideas on cost of the possiblites involved cause you may just end up with it ! Also would you have a metering block for one of these for another one I Have that I m going to sale ?



KPLugnut
Member
posted May 31, 2002 12:18 PM
We have new and used metering blocks of all types.
Our basic teardown, analysis, and refresh job for a 2bbl of that sort would start about $75. An awefull lot depends on just how much it needs to make it right again, tho.
If you have another of those carbs, we might be able to work a deal as a "trade" of sorts, if you're interested.

Just let us know how we can help.

Dayton Umholtz, owner
Kinetic Performance


ddoti1
Member
posted May 31, 2002 12:43 PM
Thanks I may just send this one to ya ! As far as the other one I d rather keep it as hard as they are to come by ! Just give me some info and you my see it soon ! Cause I hate it when things don t work properly ! What would a good used metering block cost for a 6425 !

Thanks !

KPLugnut
Member
posted May 31, 2002 02:27 PM
If/when ya get ready, just ship it to:

Kinetic Performance
373 Van Dorn Rd. N.
Ithaca, NY 14850

A used metering block would run about $25 in "as is" condition. If we go thru it and make it perfectly restored and set up for your motor, it'd be something like $100.

thanks, and talk to ya soon,
Dayton Umholtz, owner
Kinetic Performance

[This message has been edited by KPLugnut (edited May 31, 2002).]

ddoti1
Member
posted May 31, 2002 03:17 PM
I thank you for your time ! And we will get together soon ! But one last question on this carb the Metering block appears to have had 6425 or 6423 stamped like any other carb but it has been stamped out with xxxxx and above it has 7023 does this mean anything to you, I m assuming @ some point some has altered the metering block and maybe or possibly the gasket could be wrong ?

Thanks for your time !

ddoti1
Member
posted May 31, 2002 03:18 PM
Dayton could I have a phone #

Thanks again !

[This message has been edited by ddoti1 (edited May 31, 2002).]

steamatic racer
Member
posted May 31, 2002 03:32 PM
What have you heared on the KEITH DORTON SERIES 2BB.CARB. from HOLLEY? I run a sportsman racer out of tri-city ILL. and alot of racers run C&S CARBS. (out st.charles MO.) Have you heared of these also? What would you recomented?

THANKS TERP

KPLugnut
Member
posted May 31, 2002 08:55 PM
You can reach me at the shop/home phone after 4:30pm EST up 'till 9pm weekdays, and most all weekends. The number is:
607-277-6462
Also, I can be reached (discretely) during the daytime (EST) at 607-266-3129, but that is not a place I can often talk racing at great length.

On that metering block, I'd say someone could possibly have altered it, but until I got thru it, I can't say what might have been done.

As for the Keith Dorton carbs question, they are nice pieces, for sure, however, like all carbs, they do require fine tuning to maximize them. However, I would not recommend them unless you are limited to fully stock internal dimensions with respect to venturi, boosters, etc. For that, the Dorton series, and ours as well, do a fine job of maximizing the rules.
I'm not sure what your specific rules require, but if you are not bound to anything but "stock appearing", then I'd say go with something other than the Dorton series carbs.

Hope that helps,
KPLugnut


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