72 TA : New Project

[njsteve]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 68 Vert</div><div class="ubbcode-body">Steve, my former WW5 HO car would nose over around 4,500...I ended up changing the metering rods and adjusting the secondary air valve. Problem solved.
To start, make sure you have the correct metering rods, hanger and cam. I would start with 3/4 to 1 full turn on the air valve and go from there.

I'll see if I can find which rods I used...

Mike </div></div>

I checked and the metering rods are the stock CR rods. Just out of curiosity, what would the recommended change be from there?

[njsteve]

I see what you mean about that article! I never realized Quadrajets were that complex. I'll see what the secondary air valve spring is set at and go slowly from there.

[njsteve]

On the advice of Phil at Custom Rebuilt Carburetors, here in New Joysey, who I bought the 7042273 Quadrajet from in 2005, I unbolted it and brought it by his shop where he freshened it up. He ended up putting in a pair of BE secondary metering rods, replacing the leaner stock CR rods and rechecking everything on the flow bench.

No flat spot anymore. A noticeably more linear power band.

Runs scary fast now - keeps pulling all the way up the rpm range. Thankfully I have forged connecting rods now. [img]<<GRAEMLIN_URL>>/burnout.gif[/img]

Here's Phil's website. Lots of neat stuff vintage stuff there. He has a lot of rare carbs in case anyone is looking for something weird and original.

http://customrebuiltcarbs.com/