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Steve Williams · 06-12-2014, 10:48 PM

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.

06-12-2014, 10:48 PM	#4
Steve Williams Member Join Date: Aug 2007 Location: Detroit, Michigan Posts: 352 Likes: 0 Liked 1 Time in 1 Post	Re: Hardblock Question 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.