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Hello, I have a rebuilt 258 (<200 miles) a new weber 2 bbl and an HEI ignition. The 258 idles very rough with the timing below 12 degrees so it is now around 13-14 BTDC. There is hesitation if I step on it and low end power is sufferring a bit. Everything is fine above 2000 rpm but it is a...

Thanks for the reply. I will blank off all the vacuum lines tomorrow (there are only 3) and give it as try. As of now it will not run at 9 degrees unless I put the idle up to 2000 and then it runs very rough. I am not using the idle mixture to adjust idle rpm, but I know that the rpm is...

Hello, I have a 4.2 with a new weber 2 bbl and HEI distributor. It basically runs good but I cannot get the timing anywhere near 10 Degrees BTDC. Right now its around 20 degrees BTDC. If I retard it any more it starts to idle rough. Also, the idle mixture screw seems to have no effect. The rpm...