I've rented and used the Isky tools for notching both pistons and cylinder wall bores wrench scope
Not real precise but I did get more than enough clearances with those tools and a good 1/2 drill motor wrench shruggy
I ended up buying all those tools I needed on the second engine that I needed them for up

Last edited by Cab_Burge; 12/06/22 11:40 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)