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 Holley 670 Street Avenger 0-80670-3 calibration 
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Joined: Thu Dec 12, 2013 6:56 pm
Posts: 58
I have a friend that bought a Street Avenger new about a year ago and it has ran ok but not spectacular. I had him pull it off and I plan to check it all out top to bottom but I haven't had a chance to pull it apart yet. It is going on a flat top piston 350 with camel hump heads and a Comp hydraulic roller cam with 280/288 advertised and 230/236 duration @ .050" with 113 LSA and .540"/.534" lift. Car is a '55 Chevy 210 Panel.

Is there anything that is a classic issue with these that I should look out for?

The metering blocks have cup plugs in them and the primary block is stamped 11761 and secondary 11075-3

Thank you in advance for suggestions!


Fri Apr 14, 2017 12:59 pm
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I don't recall which it was, some of those carbs had 4 corner idle with metering on the secondary idle side set up for two I believe. Usually too small of an idle air bleed in the rear. My suggestion is to map out the metering, post it to se if anything stands out.


Fri Apr 14, 2017 1:16 pm
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That's my plan Mark. I will post more info once I get a chance to get it apart and check everything.

Thank you much.


Fri Apr 14, 2017 2:37 pm
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Do you race at devil's bowl?


Mon Apr 17, 2017 3:52 pm
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I had one of those a few years ago. Don't remember the exact numbers but it was apparently a common problem for them to be pretty lean out of the box. Mine only had front idle screws and a rear plate instead of block. I moved the rear jets to the front, put in bigger rear jets (8 sizes bigger than the now front ones), then readjusted the idle mix screws. That got me "close enough". It was back before I really started tuning with a WBO2 and vacuum gauge.

If you don't have a WBO2, try the above and see what happens. Every engine's needs are different. This may not fix yours. It is easy to reverse back to stock and only costs $5 for one set of jets.


Tue Apr 18, 2017 12:46 pm
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Joined: Thu Dec 12, 2013 6:56 pm
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Thanks for the info doc. I had noticed from some web searches that most people find they are on the lean side as the come from the factory. That makes sense because he has complained about a mid throttle bog when leaning into the pedal so it was probably a lean bog.

I have still yet to get it apart due to way too many things going on in my life. I will get it apart this week and post up the stock tune.

Jetfast - no I don't. I'm from Nebraska


Tue Apr 18, 2017 3:17 pm
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Joined: Thu Dec 12, 2013 6:56 pm
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Here is the tune of the carb as it is out of the box. All he has done is change jets and accelerator pump squirter from the factory settings. This is a two corner idle carb with vacuum secondaries.

Primary - straight leg boosters
Cup plugs in metering block
64 jets
IAB .081
MAB .027
Two emulsion .027 on both
One .027 above kill bleed area. Bleed goes into main well.
IFR .028 in low position
PVCR .047
6.5 power valve
35 accelerator pump squirter
41R-466 pump cam in position 2

Secondary - straight leg boosters
Cup plugs in metering block
67 jets
IAB .046
MAB .025
Two emulsion .027 on both
No kill bleed, no extra hole above
IFR .028 in low position
No power valve or accelerator pump


Tue Apr 18, 2017 10:21 pm
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Location: Canada
What jumps off the page for me is:
- 0.081" PIAB seems big... the 0.028" PIFR sounds close enough, but somewhere around 0.070"-0.073" PIAB might be better...
- #35 shooter seems big...
- 67 secondary jets seem small... 70 or so should be the norm...

_________________
Mike

1986 Mustang convertible. Originally 3.8L V6 with EEC-IV CFI.
Now has a Holley List-4412-2, and averages 34 (28 US) MPG.
If you're ever bored - some narrow band O2 tuning video of this thing:
http://www.youtube.com/channel/UC9glRIa3jAAtNhaXfg_cZXQ


Wed Apr 19, 2017 12:38 am
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Joined: Thu Dec 12, 2013 6:56 pm
Posts: 58
He increased the accelerator pump squirter some due to the lean bog. I think the real issue is lean jetting especially on the secondaries. I agree the primary IAB seems big.


Wed Apr 19, 2017 2:00 am
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Look at the jetting on a 650 DP, it's 67/73 on later calibrations with a primary PV. might be a good place to start. Bring the RPM's up to about 2500, put your finger over an idle air bleed see if it gains or loses RPM. If it gains its lean, if it loses more than a small amount it may be rich.


Wed Apr 19, 2017 9:39 am
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