Why is my Chevelle backfiring?

Backfiring is typically caused by an air/fuel mixture that is too lean, meaning the mixture has too much oxygen in it. If the fuel is contaminated with water or dirt, this too will result in a lean air/fuel mixture. The fuel tank should therefore be drained if the fuel has been standing for more than three months.

How much horsepower does a Chevy 454 have?

Surprisingly, the 454 laid down an impressive 330 horsepower and 475 pound-feet of torque. Naturally, the truck-based 454s were tuned for torque, so having nearly 500 pound-feet wasn’t a big surprise.

When does carb backfire on a Chevy 302?

The pump travel can be increased by moving the linkage to the hole closest to the carb float body. OK I have the same problem with Carb backfire on an original chevy 302. It happens more frequently when the ambient temperature is above 85 degrees. In fact it doesn’t even want to idle then.

What causes engine to backfire through carb with stumbling on acceleration?

The engine still stumbles and backfires through the carb. I called the carb place that rebuilt it and they said it must be an electrical or iginition problem as a backfiring problem is 99% electircal. Also when the engine is floored with the accelerator pedal, the engine dies unless you let up right away on the gas.

What kind of smoke comes out of an engine backfire?

Prior to yesterday, the engine was running great, plenty of power on acceleration and was the best that it ever ran. Also, after the initial backfire and stumble, when you get to the higher RPM’s the engine runs fairly strong and light black/gray (not rich thick black) smoke comes out exhaust.

How many horsepower does a Chevelle SS 454 have?

Even today, Chevrolet’s big-block 454CI beast gives modern engines a run for their money. The Chevelle rolled off the line with 450 horsepower 5600 rpm! That’s only five less than a modern Camaro SS, an engine comprised of four decades of R&D (keep in mind a new crate LSX 454 can be had with over 600HP).

What kind of car was the Chevelle ss454?

In the 1960s and ‘70s, horsepower was king, and the Chevelle SS454 reigned supreme. Americans like big things. Big hot dogs, big homes, the Big Gulp, and big cars.

What’s the price of a new Chevy 454?

The bill: $3,699.96 for all but the carb. The results: 567 horsepower and 537 pound-feet of torque on 89-octane pump gas! That represents a 70-percent increase in horsepower. That’s impressive! And remember, that’s all without touching the bottom end.