like to know if anyone has used a copper .005 gasket on there zenoah 260 and has seen a differance in performance or reliability thanks for any help

With only the gasket i feel that there was a sllight improvement in torque but to gain full benefit you need to port engine, mod piston, experiment with pipe, etc.
Where are You Scott You Iz Da Mota Man Ed

Ed is correct. I mentioned this in my original review of the UTG gaskets on MGB.com. By using only the gasket you will drop the cylinder, raise compression, increase intake timing duration and DECREASE exhaust timing. In my opinion, one of the most important gains with these motors comes from INCREASING exhaust timing, so this does the opposite. After installing the gasket, the minimum one should do is raise the exhaust roof at least the same amount you just dropped the cylinder, so approx 15-20 thou. As for the intake timing, it should be pretty close by simply using the .005" gasket. It is always best to measure timing with a degree wheel but to get a rough idea of the material to be removed you can use this chart: www.modelgasboats.com/index.ph...=150&topic=69.0

Measure with a degree wheel first to know where you start from! Recheck after cutting...leave a little room for error...once you take it off you can't put it back!

I have tried a few types of UTG (Ultra Thin Gaskets) and I would strongly recommend the ones Carlo at CC Racing Engines sells. They are made of dead soft copper and seal better in my opinion.

:-\ Ah .... well, without some added tweaking of the porting specs, not much notable is going to change.
Just reducing squish clearance will only add torque, yet take away from the top end.

You would be better served by requesting what you want in a power band type ? .... for NO performance work is broad spectrum only a gain in a particular rpm range and set up specific application.

We only wish a specific mod covered all the required needs we find in model boating

Scott