I finished up my cam swap on my 83 Z-28 earlier this week. It idles good and drives good but when I get on the gas the car does not have the power it did before the swap. Any ideas here? My car has the lg4 motor and my mods are Comp Cam XE262, Comp 981 springs, Edelbrock RPM Qjet manifold, Edelbrock TES Headers, 3" Flowmaster exhaust, and a 14x3 K&N open element. I also just put in new plugs, cap/rotor, and coil.

Im thinking it could be

1. Timing- I got it set at 8 degrees advanced right now. Think it needs more?
2. Valve lash- Im pretty sure I have it set right seeing how ive done it over 4 times already just to make sure lol. But this whole swap has been a learning experience so you never know. I don't think I have it too tight, maybe too lose if anything. If the lash is set improperly could that be a source of my problem?
3. Carburetor- I rebuilt the Q-jet during the cam swap. It runs good but maybe I need to fine tune it since I put a bigger cam in?

What other things should I look at? I am still learning here and the cam swap has definetly taught me a lot but I need some help here.

Soundclip- http://videos.streetfire.net/video/9...d100eafed6.htm

 

Assuming it is mechanically sound, it could be timing or the carb.

Are the vacuum secondaries opening when you floor it? There is a linkage piece that will not let them open until the choke goes off. Also, you might have the secondary air valve spring too tight.

Is this a computer controlled or a vacuum advance distributor?

 

It is the stock computer controlled distributor. I will have my bro floor it while I look at the secondaries, I will check the spring out too.

 

The secondaries won't completely open if you just rev it. However, if you hit it quickly off idle (stab it WOT briefly) the top butterflies should open a little, which means it working OK.

What is the stock timing setting?

 

The stock timing setting is 6 degrees. The top butterflies did open up a little when I stab'd the throttle. I went out and bought a dwell meter so I could check some of the sensors on the carb, just need to read up now.