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Yes, even compression across the board too.

Yeah, it’s firing on all 6. I just tuned it up and double checked everything. I read there is a cast crank slant and a forged crank. Could that be an issue?

Hello! So I’ve been working on my recent acquisition, a 1968 Valiant. It originally came with a 170 slant six engine and a three speed manual column shifted transmission. At some point, somebody put a 225 engine in the car. It has a shake at idle and a harmonic vibration at cruise speed. Looks...

I had this same problem on a 69 Dart I had. The problem was build up on the valve stem. Trying to run a mixture of old gas that was in the car and new gas. The valves would stay open, not close all the way. The piston would smack it and bend the push rod. I had to pull the head, completely...

Check your vacuum advance too.(if you have one) pull the vacuum hose off the carb and suck on it. If there is no vacuum held then its the advance diaphragm.

1987 I believe. The 3.9 V-6 replaced it