Hardblock Question

[BillK]

I have never seen much of an issue with Hard Block. I did have a customer use one of the other brands and he had a heck of a time. Took a couple of freshen ups for that stuff to settle down
I am getting ready to fill a SB Mopar block, maybe I will do some measuring before and after and report back ?

[SSDiv6]

Although Hard Blok claims the expansion rate of their product is the same as gray cast iron, when I spoke to them, they could not tell me how they based their claim.

On the other hand, Embecco 885 is a fully tested product for use by the government, with lots of supporting data and it contains cast iron in its formulation. Never had any issues with the product and the blocks have never changes in the block dimensions.

[randy wilson]

I'm sure there are people who do fine filling their blocks. Just telling of my personal experience. It NEVER settled down for me in any block used. To each his own. We may have actually applied it wrong.

[Steve Williams]

I wouldn't fill with hardblock or any aggregrate based filler. I have been using bowling ball epoxy with excellent results. Mix it to the ratio listed on the bottle and it is easier to fill and cleaner overall. Water jackets need to be clean though, no debris or coolant or oil.