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Avenger
Pontiac V8 Avenger
The Easy One — Avenger for Pontiac V8s
The Holley Street Avenger is the easiest carburetor on this shelf to live with. It runs vacuum secondaries, so the secondary side opens on engine demand rather than on your right foot, and it arrives with a factory preset electric choke and a street calibration Holley already sorted out. That is the carburetor for a Pontiac that starts cold, idles in traffic and pulls a heavy car.
Butler stocks the vibratory polished 670, 770 and 870 CFM Street Avengers, all 4150 square-bore, each shipped with a fuel line kit so the install does not stall at the parts counter.
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1. Who the Avenger Is For
This is the street end of the Holley range. If the Pontiac is a driver — a GTO, LeMans, Firebird or full-size car that sees cold mornings, stop-and-go and highway miles — the Avenger asks the least of you.
| Vacuum secondaries | the secondaries open on manifold signal, which is far more forgiving on a heavy car with a stock converter and tall gears than a mechanical linkage that dumps all four barrels the instant you ask. |
| Quick change secondary housing | the vacuum housing cap comes off without pulling the carburetor, and springs are included, so you can bias the car toward throttle response or economy in a few minutes. |
| Electric choke, preset | factory preset for cold starts. Nothing to wire to a heat tube, nothing to cable to the dash. |
| Vacuum ports | one timed spark port, two full manifold ports and a PCV port, which is enough to feed distributor advance, power brakes and PCV without tapping the manifold. |
2. What It Costs You Going Up the Ladder
The Avenger trades ultimate tuning depth for out-of-the-box manners. It has no four-corner idle circuit and no billet metering blocks, so a very large cam with low idle vacuum is not its natural habitat — that is where the Double Pumper and the XP series start to make sense. In exchange, this is the only rung of the ladder that will happily choke itself on a 30-degree morning.
| Sizes stocked | 670, 770 and 870 CFM, all in the shiny vibratory polished finish. All are 4150 model carburetors with a 1.688 inch throttle bore and straight leg boosters. |
| Automatic transmission | compatible with GM, Chrysler and Ford kickdown linkage, though additional parts may be required — check Butler's linkage and adapter shelf before install day. |
| Included fuel line | every Street Avenger ships with a fuel line kit, and every one is 100 percent wet-flow tested by Holley before it is boxed. |
If you want a carburetor that behaves like a factory piece but flows like an aftermarket one, this is the shelf. If the cam is big enough that idle quality is already a project, look one rung up.
Not sure what your Pontiac needs?
Email our tech team at tech@butlerperformance.com. Tell us your engine, heads, car, and power goal, and we will put the parts together as one combination that works.