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Got a 352, 3 spd, runs good, idles fine, no smoke of any kind. But let off on the gas and it will sooner or later backfire through the exhaust, I wondered why it didn't have a tail pipe on it. I remember as a kid that you could do something to make it happen, just can't remember what it was. Can someone refresh my memory. Thanks.
I hate to admit that I did this.
But as a young kid I used to get up to about 45 mph, Turn off the ignition pump it a couple of times and than turn the ignition back on and KABOOM. Blew out three sets of Midas mufflers and kept getting them replaced under warranty. I don't reccomend this as it washs the oil off the cylinder walls and causes premature engine failure.
I paid $700 for a '66 F-100 just so I COULD do this again!
I might add that it's a very effective deterent if you have a little rice-grinder Honda all up under your rear bumper...particularly because they drift in even closer when you cut the ignition to load up the cylinders.... then KABOOM! and noise and racket and black smoke everywhere...no more tailgater . If you weld up your exhaust all the way out through some cherry bombs it'll hold up for years.
I did it once in a company truck to scare this dog on a dairy that was always chasing me when I went by,it blew the tail pipe off and almost nailed the dog. Got me a new exhaust on my work truck.
i did that in my 82 F-150 whith a 300-6 after i built it up. It made a nice back fire through dual 2" stright pipe. Only it killed the Holley's power valve, lol