my engine rebuild

i thought i would give you guys an update on my 68 engine rebuild. long story short is that we found that the cylinder that we knew had no compresion has a hole in the piston. the rod is not broken and it kinda looks like burnt piston like you would see on an engine that had a little too much No2. we are obviosly going to have to replace it.

we were thinking that our engine has non-stock pistons because they are domed but we can't really remember what stock ones looked like. a pic or discription of stock ones would be very helpful.

i'll try to get some pics up of the hole in the piston.

any theories of what happened?

1968 911's have domed pistons - all 2.0 liter 911 engines do. A holed piston is due to too much heat - usually ignition timing too far advanced, poor fuel, lean mixture, or someone lugging the engine. The early engines suffered from poor flame propogation because of the high dome.

thanks for the info.

up to what date(years) did the dome pistons last?