Thanks for the reply Scott. This 1969 has been a challenge for a few years now. Thank goodness for the internet. It's amazing what you can find. I can remember looking over microfiche at the marina parts dept 35 years ago and paying thru the nose for everything!
A bit of a story here but.... I have a 1969 Mercuiser 160 HP straight 6. In trying to find a replacement intake manifold I found......none to be found. So I bought a "log style" made by Barr Marine which fits the 1970 and later Mercuiser 165 which as far as I can tell is identical dimensionally...
Good point on that. I pulled the valve cover yesterday and I did notice one of the rocker arm nuts appeared to be tightened down more than the others with more threads showing thru the top of the nut. Could be different length on the stud but definitely going to reset the valves.
As we speak I'm looking for the cheapest valve cover I can find so I can cut the top out of it and reset the valves. During this whole time I've been struggling with this problem there have been times when it ran perfectly for 30 minutes or so but eventually does it again. I guess I'm waiting...
Agreed, I'll bet it's the exact same cylinder head. I have reached out to Barr Marine about it. They used to offer a replacement manifold for the 160 but now only offer the 165.
Thanks for the reply Dubs, yes new cap at least twice, plugs, wires. With the Pertronix I put a new Flame Thrower coil in. At one point I noticed the coil getting very hot and thought it might be breaking down. I measured voltage at the + side of coil and was getting well over 14 volts...
I am new to this forum but have been operating and rebuilding boats almost my entire life. I operate on Lake Winnipesaukee in NH. I currently have a 1969 Mercruiser 160 inline 6 that is driving me crazy with backfiring under load around 3000 rpm but it is inconsistent. The engine has been pulled...
