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About 5 weeks ago I started a thread about a 67 Firebird hot rod used as a Christmas tree delivery vehicle. Its engine had a severe surging idle anytime they let the rpm's drop. Then tonight I got a short video clip of another late 60s GM pony car(a green 68 Camaro) that has a bad "run in" with a concrete barrier while doing a burnout to pre-heat his tires during an apparent "wheelstand competition". It too has a big block GM engine, that also has the exact same severe surging idle as did the Firebird before it.
It used to be somewhat normal for a fairly heavily modified V8 to have a "rough" idle, due to the choice of extreme camshaft profiles that make the engines run great at rpm's over 2500, but "not so much" when idling! However, they used to idle with an inconsistent rumble. But rarely did a "rough idle" equate to the type of surging like we hear with these 2 cars. What's the difference here with these cars? Watch the whole short video, he STILL tries the wheelstand even after hitting the wall!
It used to be somewhat normal for a fairly heavily modified V8 to have a "rough" idle, due to the choice of extreme camshaft profiles that make the engines run great at rpm's over 2500, but "not so much" when idling! However, they used to idle with an inconsistent rumble. But rarely did a "rough idle" equate to the type of surging like we hear with these 2 cars. What's the difference here with these cars? Watch the whole short video, he STILL tries the wheelstand even after hitting the wall!
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