Thread: Holley Street Avenger

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I'm building a 327 for my T-Bucket and I've been looking at the Holley Street Avenger carbs (570 cfm or 670 cfm) to replace the Edelbrock 600 cfm Performer it's currently running.

So for you guys that are running the Avenger carbs, how do you like them and how much tuning did you have to do or do they run fairly good out of the box?

The engine will be .30 over, .194 valves, roller rockers, gear drive, some type of HEI, a Comp Cams 268 cam, and a Edelbrock Performer intake. Tranny is a Powerglide with a shift kit. I'm not sure yet what the compression ration will be.

Never have ran one of the Avengers, so can't say much about them. What's up with the Edelbrock that you want to replace it, normally they are a very trouble free street carb once calibrated correctly....

I used a street Avenger on a zz4 right out of the box. The only tuning needed was a slight turn of the electric choke and lowering the idle screw.

I`m running a 670, runs fine right out of the box, but I did drop the jets down two steps later, 570 is more than ample for your 327.

I would say Holley or Quadrajet. Holley makes a excellent product and a quadrajet is geared more for fuel economy but can handle about 400 horses.

Originally Posted by Dave Severson

What's up with the Edelbrock that you want to replace it, normally they are a very trouble free street carb once calibrated correctly....

I'm pulling the 350 out of the T-Bucket and putting it in my '56 Chevy. Since the '56 has a 6 banger i'm putting the complete engine in the '56.