My dad purchased h618cp pistons a few years ago, we cant find if we could put them in an lt1, does anyone know?

 

Without doing the research for you, if they are made for a SBC, are the diameter of the bore of your unmentioned engine application (4.030") and have a compression height corresponding to the unmentioned rod you are planning on using (5.7", 5.85", or 6"), and have the desired piston top style (flat top, dished, domed?), then they will work.

 

Do a search for c618cp pistons and all will be answered. They're probably cheap speed pro hypereutechtic pieces.....