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Old 04-03-2013, 09:06 PM
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Holley Street Avenger 670 tunning help

I have this carb installed on my freshly rebuilt SBC 355. Any buddy have any idea what power valve it comes with out of the box? When I checked my manifold vacuum I was getting 6 @ 800RPM and Im not sure if the wrong power valve could be creating my issue. My main issue at this point is the curb idle screw has litterally no effect to the idle speed. I have to have the screw turned all the way in to keep it idling. when I rev it up it does idle up quite a bit but then just drops back down. Anyone have any thoughts??

If you guys need anymore info let me know.

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Old 04-03-2013, 09:35 PM
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I thought you were going to use a 750 HP?
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Old 04-03-2013, 09:51 PM
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Originally Posted by vinniekq2 View Post
I thought you were going to use a 750 HP?
I was going to but a holley tech talked me out of it. Said the carb I have is good for what I am doing with the car.....know if I could just get it to idle properly
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Old 04-03-2013, 10:16 PM
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turn the rpm up to 900,the stock PV is not likely to work,no idea what it is,not a 3.5 for sure.
make sure your static timing is 20 or so.
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Old 04-03-2013, 10:25 PM
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Originally Posted by prostcelica View Post
I have this carb installed on my freshly rebuilt SBC 355. Any buddy have any idea what power valve it comes with out of the box? When I checked my manifold vacuum I was getting 6 @ 800RPM and Im not sure if the wrong power valve could be creating my issue. My main issue at this point is the curb idle screw has litterally no effect to the idle speed. I have to have the screw turned all the way in to keep it idling. when I rev it up it does idle up quite a bit but then just drops back down. Anyone have any thoughts??

If you guys need anymore info let me know.
Should have a 6.5 power valve in it from the factory. My 670 SA did. Hope this helps
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Old 04-03-2013, 10:51 PM
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Quote:
Originally Posted by vinniekq2 View Post
turn the rpm up to 900,the stock PV is not likely to work,no idea what it is,not a 3.5 for sure.
make sure your static timing is 20 or so.
It is a 6.5 like lhmurphy said ( I checked the manual). I can barley get 900 RPM with the idle screw wound all the way in. I also only have 6 at 800RPM for vacuum.......vacuum leak??
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Old 04-04-2013, 07:19 AM
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make sure your static timing is 20 or so.
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Old 04-04-2013, 08:19 AM
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Originally Posted by vinniekq2 View Post
make sure your static timing is 20 or so.
Static is set at 20 and all in at 3000-3500 at about 35. I did notice that there is fuel pouring out of the upper squirters at idle which doesn't seem right. The flaot level looks good and fuel pressure is about 8psi (which is a little high but I wouldn't think it would be enough to push fuel passed the needles). Maybe I'm wrong about that though.
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Old 04-04-2013, 08:36 AM
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regulate pressure to 5# and replace needle and seat.
Im so surprised the holley tech said to use the 670?
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Old 04-04-2013, 08:49 AM
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When you need to screw it all the way, it could mean the holley secondary adjustment is closed too much.

Was that 6" in gear, in N , at load?
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Old 04-04-2013, 08:54 AM
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When you need to screw it all the way, it could mean the holley secondary adjustment is closed too much.

Was that 6" in gear, in N , at load?
That was 6" in N which seems really low doesn't it when a stock cam is around 18 or 19 right?? I did take that reading before I had me ignition issue resolved ( wiring for fal box to distributor were routed in a way that they were causing interfierence with the box).
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Old 04-04-2013, 10:14 AM
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That tells me incorrect valve adjustment or incorrect timing.
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Old 04-04-2013, 11:03 AM
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Quote:
Originally Posted by prostcelica View Post
That was 6" in N which seems really low doesn't it when a stock cam is around 18 or 19 right?? I did take that reading before I had me ignition issue resolved ( wiring for fal box to distributor were routed in a way that they were causing interfierence with the box).
How many turns out are the 2 idle mixture screws? If they are screwed in too far it could choke the amount of air/fuel the engine needs, which in turn would lower ur vacuum way down but check for vacuum leaks! Lol
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Old 04-04-2013, 04:28 PM
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Best guess. Your hydraulic valve lifters are adjusted way too tight. It is very easy to bottom the plunger in a new lifter that has no oil in it.
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Old 04-04-2013, 05:49 PM
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Ok guys. I got it figured. I was checking my vacumm with out the advanced hooked up. I put a T in and am get 12"'s of vacuum which seems right. The idle issue was as simple as adjusting the mixture screws. Runing great know. Thanks for all your help guys.
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