545 not pulling it's weight

Thanks all for the help. I've spoke to a local speed shop and they will not even look at it until I get rid of the 870 avenger carb; I'm looking for an 850 or bigger double pumper now.

I'm stuck with the cam for now as it's part of the 1 year warranty I got; it;s the biggest one my builder would warranty for the full yr. I plan on changing it in a year.

Gear ratio = 4.10
Tire size = 315/75/16 or 35"
C6 trans with wide ratio kit

Intened use is my local daily driver but I want it to go like all hell as well.

Sorry no dyno sheets at this time.

Couple of questions and suggestions:

1) What is your timing set at, initial and total, and at what rpm is all the timing in at?

2) When you are stating a lack of power, what exactly do you mean? Can you fry the tires from a stand-still without having to brake-stand or any other tricks? Or, does it run out of steam at a certain rpm?

3) Where do you need the most power, rpm wise?

4) Have you spent any time tuning the carb, such as, installing lighter springs for the secondaries?

5) Have you checked that you're getting full secondary opening on the carb?

6) Install a vacuum gauge, and give us the reading when idling, cruising, and at WOT.

7) What size air cleaner do you have on it? Is it sucking in hot under the hood air?

Something is wrong, and I suspect it has to do with the tuning. Even with such a "small" carb, you can make over 500 hp. The small carb starts to hurt hp at higher rpms, but at lower rpms, it should be just fine.

As far as throttle response goes, I was never able to get the same "crispness" that a double-pumper Holley gives from either a Holley vacuum secondary or Edelbrock carb, from home tuning.

Hope that helps,

Dave

bigblok86ranger
No HP guarantees. Speed shop said the've had to many tunning issues with the avenger series carbs. It's taken me almost 3 months to get the engine installed, so I have 9 months on the warranty. Roughly about 100 miles on the engine now; there is no milage restriction on the warranty. The build was pretty much right off the shelf.

fireballferkey
I could easily put some mufflers on backwards as well. Good thing this build has straight through Magna Flows.


DJOHAGIN
1) 18 initial, 34 total - all in by 2500
2) Its slugish at the bottom - frying tires, yes but just barley. I talked to Hughes converters yesterday and they said that I should not go to the next converted as it will be an 11" instead of a 12". They said with the weight of the truck this would be an issue. No sure if the converter has anything to do with it; I'm current runnig a Hughes 2500.
3)down low (but of course 1500-6200 would be great) I have no plans to rev higher than 6200; rev limit will be set at 6k
4)Yes, I have the weakest spring in there now. The transision seems ok with no hesitaion. I actually was thinking they weren't opening.
5)No - How do I do this?
6)at idle its 13-15 and bounces the hole time. I will get the other readings to nite.
7)14"x5" I have not reinstalled the hood yet.

I'm not super thrilled with the vac sec myself but thought it would be good considering the weight (5200lbs). I talked to holley and the said my ruff idle could be becuase I have the primarys open to far and not actaully using the idle circut. They suggest craking the secoundaris open a half turn and reseting my idle mixture and curb idle. They also said to see if I have vacum at the port vacum while idling; if so this would be a good indication that I'm not using the idle circut.

Thanks All.