Rough running 1937 115-c

Posted by David rose On 2015/5/18 18:58:45

My Packard 6 idles smooth but when I rev it up a little I have some type of ship/ shake!!. I removed the belt on the harmonic balancer and put a hand on it and it feels ok ?. compreshion is 120+- and holds, plugs are white/brown, oil pressure 30-35, ten good. Could this be the balancer? I could use some help on this . Thanks. Dave