Restoring a 340 need advice

Losi said

Forgot picture of current pistons

View attachment 1715765241

View attachment 1715765242

Click to expand...

Yeah cool. That's the 68-71 early high compression pistons. Rated at 10.2, in reality around 9.5, but still nice. Can you catch a fingernail really hard on the ridge, or is it somewhat small?