Thread: 83 Z-28 w/ 406 roller hasn't the power it should, please comment?

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Edit - I was typing as you posted. Hopefully my approach is not too elementary - no offense intended. Like Jerry says, there's a ton of details that would help understand your problems, but before you get too deep hit the basics. It sounds like your carb is not properly adjusted, or maybe it needs to be rebuilt to get the accelerator pump giving you a full shot in transition acceleration. Pull your plugs and see how they look, which will give you some clues to your problem - here's a chart with pictures of what you should see:reading_spark_plugs.jpg
If you cannot read it here's a link:
reading spark plugs - Google Search Also take your air cleaner off, look down into the carb throat (engine off) and open the throttle once - you should see two strong streams of fuel from the nozzles into the venturi.
Like Jerry says, rear gear ratio will also tell you a lot about what performance to expect. You might find a tag on the rear differential, or you can jack up a back wheel, spin it one revolution and count the turns on the driveshaft (or rotate ten times for more accuracy). Post up what you find, and people will have ideas about where your problem lies.