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Old 09-21-2002, 05:42 PM
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Post Too much exhaust out of one side only.....?

got a 350 in a 72 chevy nova with new heads and distributor.

it's running rough at all speeds.

I got headers and too much exhaust is coming out of the right side only.

what could it be?

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Old 09-21-2002, 07:41 PM
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Many years ago, I built up a 427 for my 4-speed Chevelle. Believe it or not, I took out and installed that engine in the parking lot of my apartment building. The security guard was furious with me! Anywho, after only one week the right exhaust started blowing out copious amounts of smoke. I removed one of the heads and found a huge crack in one of the cylinders! You guessed it, I removed the engine in the parking lot again and had that cylinder sleeved and reinstalled the engine on Christmas day because the security guard was off duty! The stuff we do when we are young! Anyway, you have to start with the basics. Do a compression check to start narrowing down what cylinder is acting up. Look at all of the plugs. Look in the carburator at an idle to see if the venturies are dripping fuel. Spray carb cleaner around the intake and carb to look for vacuum leaks. You'll find it. Or just fork up 80 bucks and take the auto to a shop and the'll put it on an analizer for you. Just keep you fingers crossed that it's not a crack in the cylinder like I had! Good luck
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Old 09-21-2002, 08:04 PM
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I would definitely start with a compression check on each cylinder, you can also ground a test light, and deaden each cylinder's spark plug wire, if the cylinder you deaden doesn't sound any different when you do this, you are onto one that isn't hitting properly. This sounds like a vacuum leak to me, and a big one. I recently had a 390 ford that ran like this, and it ended up being cracked in the heat riser in the intake manifold. However, you can find your problem via process of elimination. If you have good compression in each hole, then move onto timing, fuel and fire. Read your spark plugs. If you are new to the game, find a friend who's a little more adept at troubleshooting, you'll learn alot more this way than taking it to a shop. Carburetion can cause this type of thing to. I once had a 455 Pontiac with Q-Jet, that went down to four cylinders when dirt plugged up the carb. You said earlier that you had the valves adjusted, and it ran well, then it started to run poorly again, maybe your valvetrain is not staying adjusted, maybe your rocker arm adjusting nuts are backing off,maybe you have a bent pushrod or two.
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Old 09-22-2002, 04:00 AM
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You also might make sure your rockers haven't backed off, I remember a similar situation that turned out to be worn rocker nuts ( lost the self locking) and had the same symptoms. It had also had new heads recently installed.
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Old 09-22-2002, 07:06 AM
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In addition to a compression check, it may be more helpful to do a cylinder leakage test. Listen at the valve cover hole, and the tail pipe.
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Old 09-22-2002, 08:49 AM
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A few months ago I redid a SBC. Got it all together. Ran it with open headers. Started it up tremendous white smoke blew out of one of the sides. I then put bars leak (block crack sealer) in the radiator. Still smoked alot but if it would iddle for a while it would go away then if you reved it, it would start up again. The bars leak was a bad idea. When i took the head off there was bars leak resido(this tar type stuff) in one of the tubes in the headers, and in one of the exhaust ports. I knew that there was a crack beetween water jacket and the exhaust port. I finaly got the money togehter for a redone set of heads and i got it all assembled just doing some last minute stuff and then starting it tomorrow. Hope it works
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