66 gmc
 

Hi, my name is Kent. I've been working on a 66 GMC truck for about a year now. It was a rust pile that did not run when I bought it. Now it runs well and looks good. I've rebuilt almost everything on it. The latest was new headers and exhaust. I got the headers on but having some issues with loss of power. I'm hoping to get some tune-up advice. Thanks!

Re: 66 gmc
 

Welcome from the Island Kent!
Vancouver Island that is.
Headers lean out your motor. You need to rejet or add a bunch of initial timing. Timing is easier.
What motor/trans you got?

Re: 66 gmc
 

Welcome to the forum.

Re: 66 gmc
 

Hey thanks guys...im excited to be here! Everyone on here has a lot of good advice. And thanks Geezer#99...I figured I would need to play with timing, but I only have a harbor freight gun that doesn't work. I kind of figured ide have to retard the timing? But you say advance a lot? How much? And is the only way to get my Quadro jet carburator to run more rich is to change the jets? Thanks for the advice!

Re: 66 gmc
 

Oh, and it's a 305 V8 with a munchin 3 on the tree trans

Re: 66 gmc
 

:welcome2:

Welcome to the Forum.

Re: 66 gmc
 

Try your initial at 14. Plug off the vac advance when you set it.

You should start a thread in the engine section or 60-66 section to get more help.