The pins go in easy of course, but the lock ring type retainers to hold them don't go in easy, or any other way that I can see. How do you get them in? They're like these http://store.summitracing.com/egnsea...115+4294808882. But summit doesn't have any tool for installation that I can find.

 

They are very stiff and difficult to install. I used needle nose pliers and a flat tip screw driver. The trick is to insert one end of the clip and work the rest of the clip in a circular manner. Easier said then done. Just give it a try and try not to gouge the hole or the piston surface incase you "slip up".

No special tools needed.

 

Apparently you get them in...with great difficulty.

http://www.ls1tech.com/forums/showthread.php?t=178671

 

there not that bad once you get a couple of them in, my pistons are doubled up 4 sprial locks on each piston, you can stretch them some, I just used a straight pick to work them in a circle.

 

Got 'em. Thanks for the replies. A little over two hours. I stretched them then used fingers and a little flat blade screwdriver. Getting the old ones out was almost as much trouble. Getting the old ones out might actually be more trouble if you were re-using the pistons and were trying not to scratch them.