Join Date: Nov 2002
Location: San Jose, California, USA
I'm not sure about carbureted engines, but for EFI setups Sea Foam is supposed to be just as good only cheaper.
This was a big debate among the Ls1 crowd, as it was GM's solution to piston slap.
From what I've seen though, the sea foam seems to work pretty good.
It is a bit messy, because you have to let it sit in the cylinders for a while, then flush it out.