Chevy High Performance – November 2019

24 CHEVY HIGH PERFORMANCE II NOVEMBER 2019

GOING

ANNULAR

Edelbrock

310.781.2222

edelbrock.com

Summit Racing

800.230.3030

summitracing.com

GET THE HOOKUP

An inside look at Edelbrock’s new AVS2 carburetor

✜ TEXT & PHOTOS: Jeff Smith

Many years ago, another

carburetor company introduced an

annular discharge version, so we

performed an “outside the box”

wide-open throttle (WOT) test. We put

a carbureted LS1 on the dyno, first

with a downleg booster carburetor

and pulled the engine down to around

1,800 rpm at WOT. Even with a mild

222-degrees at 0.050 camshaft, the

engine ran poorly, stumbled, and

basically was very unhappy. Then

we replaced that carburetor with the

same cfm version except fitted with

“I

t looks the same ...”
“Look closer.”
Too much of today’s packaging and marketing can be more about the
“spin” than about something really beneficial. But Edelbrock’s AVS2 isn’t
just a new and improved appellation. A simple design change to the primary
boosters makes this a whole different carburetor. There are some subtle, yet
definite, differences why this idea works, and we’ll show you why this is such
a good idea.
Normally, a small change to something like a venturi booster would not be
that big of a deal. But this is significant because of the effect it has on throttle
response. In back-to-back tests, we experienced an immediate change in
part-throttle response with the AVS2. We could literally feel it the first time we
stepped on the throttle. This does not necessarily add more horsepower, but
the response to throttle inputs certainly makes it appealing.

WRENCH