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post #1 of 17 (permalink) Old Apr 19th, 11, 10:00 PM Thread Starter
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ernie
 
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Carb gurus

hey guys, i have a 4053 dz carb. i ordered a rebuild kit and when i got it there was only one power valve in it. does this carb have a power valve in the secondary metering block? its a vacuum secondary carb so there is no accelerator pump for the rear secondaries. thanks,
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post #2 of 17 (permalink) Old Apr 19th, 11, 11:39 PM
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Re: carb gurus

one power valve in front only
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post #3 of 17 (permalink) Old Apr 20th, 11, 08:17 AM Thread Starter
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Re: Carb gurus

thanks darrell..
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post #4 of 17 (permalink) Old Apr 20th, 11, 10:22 AM
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Re: Carb gurus

The 4053 came with 2 power valves not one. The kits are generic 4150 kits and you always have to buy an 8.5 power valve for the secondary side.

...Dennis

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post #5 of 17 (permalink) Old Apr 20th, 11, 10:41 AM
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Quote:
Originally Posted by DjD View Post
The 4053 came with 2 power valves not one. The kits are generic 4150 kits and you always have to buy an 8.5 power valve for the secondary side.
Well ... in the famous words of "the Duke" - 'Now that aint exactly true'

The 'problem' here Pilgrim, is that someones gone and done sold you the $25 #37-1542 kit - instead of selling you the correct $35 #37-1544 one
This is the kit with double power valves - http://www.jegs.com/i/Holley/510/37-...oductId=743712

I mainly buy the $100 #37-1539 kits for doing a complete go through on one of these 4150's anyway.
Here's the link to the 4150 master kit - http://www.jegs.com/i/Holley/510/37-...oductId=743712


Hope this helps

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post #6 of 17 (permalink) Old Apr 20th, 11, 02:58 PM Thread Starter
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Re: Carb gurus

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The 4053 came with 2 power valves not one. The kits are generic 4150 kits and you always have to buy an 8.5 power valve for the secondary side.
with that being said, what power valve do i need for the front? 8.5 also?
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post #7 of 17 (permalink) Old Apr 20th, 11, 03:00 PM
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Re: Carb gurus

John - kinda taking this thread off topic but of those 2, only the $100 one lists that it's for the 4053 and if you search Jegs for 4053 it only lists one kit (Holley 3-1016) and it only has one PV.

Do you know for sure the kit you show with 2 pv's has a 6.5 and an 8.5 pv in it? Are the metering block gaskets correct for 4053 carb?

And no I've never bought a 37-1542 kit for use on a 4053...

...Dennis

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post #8 of 17 (permalink) Old Apr 20th, 11, 06:25 PM Thread Starter
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Re: Carb gurus

dennis, i bought the 3-1016 kit direct from holley. it had 1 power valve and the rear metering block gaskets were wrong.
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post #9 of 17 (permalink) Old Apr 20th, 11, 06:45 PM
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Re: Carb gurus

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Originally Posted by ernies 69 View Post
with that being said, what power valve do i need for the front? 8.5 also?
6.5 for the front and 8.5 for the rear...

Quote:
Originally Posted by ernies 69 View Post
dennis, i bought the 3-1016 kit direct from holley. it had 1 power valve and the rear metering block gaskets were wrong.
I did 2 carbs back to back (one was a DZ 4053 and the other was a 375 hp 4346) and I'm fairly sure that's the kit I used on the DZ. It had extra gaskets and I want to say it had the right ones. It was a few years back though, maybe the kits have changed or I'm forgetting something.

Sounds like the kit John referenced might be the ticket...

...Dennis

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post #10 of 17 (permalink) Old Apr 20th, 11, 10:56 PM
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Re: Carb gurus

yep they may be right -as far as power valve size,thats not one fit all--a base rule for front power valve --with timing set right and at best idle -take a vacuam reading at idle subtract 6.5 and that will get you close enough--with a 65 or 85 and a high duration cam,-your gonna have stumbling and idle problems
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post #11 of 17 (permalink) Old Apr 21st, 11, 09:30 AM
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Re: Carb gurus

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Originally Posted by 97Z4C View Post
yep they may be right -as far as power valve size,thats not one fit all--a base rule for front power valve --with timing set right and at best idle -take a vacuam reading at idle subtract 6.5 and that will get you close enough--with a 65 or 85 and a high duration cam,-your gonna have stumbling and idle problems
I've seen lots of stock DZ carbs rebuilt and put into service and working fine. A lot of purists wouldn't have it any other way. Against popular belief these cars ran fine the way they left the factory and dealers showroom. They may have left power on the table but they ran fine!

...Dennis

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post #12 of 17 (permalink) Old Apr 21st, 11, 10:46 AM Thread Starter
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Re: Carb gurus

my motor is a 427, 10.1 compression, stock 396-350 heads, 396-375 solid cam,does the 6.5 rule still apply in this application? thanks guys
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post #13 of 17 (permalink) Old Apr 21st, 11, 11:10 AM
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Re: Carb gurus

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my motor is a 427, 10.1 compression, stock 396-350 heads, 396-375 solid cam,does the 6.5 rule still apply in this application? thanks guys
I have never heard of the 6.5 rule as stated above for power valves. The idea is they are a tuning item just like a jet, you don't want them to open at idle so you want to start at least 2 - 2.5 below your idle vacuum. From a tuning standpoint you can effect change by knowing at what point the PV opens based on the engines vacuum signal. Think about this, if you were to ask folks about removing the secondary PV they would tell you you can do it but you will need to jet up 8 sizes or more. Now imagine being able to control when all that extra fuel comes into play.

Being more conservative here is what Holley says and unless you are willing to put in the time to tune with the PV, I recomend you follow...

Quote:
QUESTION How do I tell what size power valve I need?
ANSWER To properly size a power valve, take a vaccum reading at idle and if it is above 12" for a standard transmission a 6.5" will be safe to use. For automatic transmissions take a vaccume reading in gear at idle and if the vaccum is below 12" divide that in half for proper size. Example 9" of vaccume in gear at idle will require a 4.5" power valve.

...Dennis

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post #14 of 17 (permalink) Old Apr 21st, 11, 12:49 PM Thread Starter
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Re: Carb gurus

is that manifold vacuum or carb vacuum? or does it matter. im learning a lot here, thanks to all of you..
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post #15 of 17 (permalink) Old Apr 21st, 11, 07:44 PM
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Re: Carb gurus

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Originally Posted by ernies 69 View Post
is that manifold vacuum or carb vacuum? or does it matter. im learning a lot here, thanks to all of you..
It's manifold vacuum - you can only get it on a 4053 from the angled nipple on the passenger side front of the baseplate that has the hose on it that feeds the choke pull-off diaphragm and the A.I.R. diverter valve, or you can use the vacuum fitting on top of the intake behind the carb. The distributor vacuum port just behind the right front stud is a "ported" source. The 3/8" nipple for the PCV hose is also a manifold vacuum source, but you want to leave it connected while you're tuning.

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