holley 670 street avenger secondary springs - Team Camaro Tech
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  #1  
Old Dec 10th, 05, 03:04 PM
importkiller69ss importkiller69ss is offline
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bryan hall
 
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Default holley 670 street avenger secondary springs

i have aholley 670 in my 69 ss 350 . i was looking to upgrade the springs but dont know which one ot go with. what springs come in these from holley? and which springs are the best for all around streetabilty and performance? do changing the springs really make much of a difference or am i wasting my time tryin to change them
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  #2  
Old Dec 11th, 05, 07:36 AM
SLEEPER 86 SLEEPER 86 is offline
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Default Re: holley 670 street avenger secondary springs

pretty sure holley's website has the opening rates vs. color chart.
Eric B
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  #3  
Old Dec 11th, 05, 09:00 AM
67 Prostreet 67 Prostreet is offline
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Default Re: holley 670 street avenger secondary springs

The springs most certainly make a difference... Just changing springs helped find the last 12hp on the dyno for the 383 in my wife's convertable. I used the lightest spring Holley makes to get the secondaries open sooner. It all depends on how you want the car to react. Lighter springs will open the secondaries sooner and you will see and feel the performance, however it comes at the cost of economy. Believe it or not, some guy's will setup the secondaries to come in late to save on their fuel bill at the cost of performance. It all depends on what you are looking for?

Regards,
Tom
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  #4  
Old Dec 11th, 05, 09:24 AM
TJS69 TJS69 is offline
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Tom
 
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Smile Re: holley 670 street avenger secondary springs

The springs can be bought in a kit, that has all springs. Buy the kit and you can try them all ! (If you want). I believe the avenger series carbs have the "quik change" spring, so easy to do !
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  #5  
Old Dec 11th, 05, 11:02 AM
WaynesWorld WaynesWorld is offline
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Default Re: holley 670 street avenger secondary springs

I have the same carb. It came with a couple other springs. I swapped out the silver "best performance/economy" sping and used the yellow "increase performance" spring.

very EZ to do.

-Wayne
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  #6  
Old Dec 11th, 05, 11:32 AM
importkiller69ss importkiller69ss is offline
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bryan hall
 
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Default Re: holley 670 street avenger secondary springs

thanks guys....i will look into to changin those springs
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  #7  
Old Dec 11th, 05, 11:51 AM
DjD's Avatar
DjD DjD is offline
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Dennis
 
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Default Re: holley 670 street avenger secondary springs

From Holley -
Quote:
The opening rate of a vacuum secondary system is controlled by the diaphragm spring located in the vacuum secondary diaphragm housing. A “lighter” spring will allow the secondary throttle plates to open more quickly. A spring assortment kit, Holley P/N 20-13, is available to help you “tailor” the secondary opening rate to your application.

From my Holley carb book by Urich & Fisher
Quote:

Using a 350 CID Engine

Spring------start to open------ full open
~~~~~~~~~~~~~~~~~~~~~
Short Yellow--1620-------------5680
Yellow--------1635--------------5750
Purple--------1915--------------6950
Plain----------2240--------------8160
Brown--------2710--------------8750
Black---------2720-------not fully open at max air flow
These rpm numbers go down as cubic inches go up and an air cleaner causes these numbers to go down as well... There was no air cleaner used when they tested this.

To find the right spring, start with the plain one and test drive. If you feel the sec's kick in when you go wot they are opening too soon. If you don't feel a kick in then try the next lower spring. If you feel the kick in go back up one. You get the idea...

Not feeling the sec's kick in may seem wrong but on-track testing has shown if you feel the sec's open you are running slower with a vac sec carb...
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  #8  
Old Dec 11th, 05, 11:56 AM
edd Gordon edd Gordon is offline
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Default Re: holley 670 street avenger secondary springs

I got same 670 on my 406 68 SS the secondaries do come in late with stock springs but I don't think I will change it as it runs great and fuel mileage (all though not checked yet) doesn't seem bad and spark plugs are burning just right color and the performance is not bad feels like it could be a mid 13 second car with some tuning. I have only got 300 miles on it and will see if the carb needs tuning after engine is broke in.
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