Hard Blok - Block Filler
 

I wanted to get a few opinions on the best way to prep a block for filler (Hard Blok). In the past I have hot tanked the block, pressure washed it and then used muriatic acid for the final cleaning. Drained the acid, pressure washed again, dried and poured. I don't like working with muriatic and haven't used it for years, but am concerned I won't get it as clean as it should be. Any comments or alternate ideas?

Re: Hard Blok - Block Filler
 

I just had my block tanked and used the stuff from this guy Ken's Speed & Machine Shop.

Pours, works and sets a lot easier than Hard Bloc. I'm a dawdler so I did 1 side 1 day and the other the next and drank beer in between. :)

Re: Hard Blok - Block Filler
 

I use muriatic acid as well. I haven't found a better way to get the water jacket clean enough.

Re: Hard Blok - Block Filler
 

Make sure all freeze plugs are out, hot tank, wash out and then use only brass freeze plugs before using muriatic acid.Make sure the drain plugs are out, rinse and dry the block thouroughly, then install the filler one side at a time as was suggested with a day or two in between. Take your time and do it right, as I know of no way to get this stuff out if you do it wrong.Make sure you do the acid in a well ventilated place because it will stink up the place, and the fumes are corrosive.

Re: Hard Blok - Block Filler
 

I have found that it bonds to the block/cast iron surface a little better when the water jackets are a little wet/moist.

Re: Hard Blok - Block Filler
 

You should at least wear some sort of cotton or gauze mask to keep the inhalation of the vapors to a minimum, even when using muriatic acid outdoors.

Re: Hard Blok - Block Filler
 

Thanks for the replies.
Yes I know muriatic is ugly stuff to work with. I have the proper respirator/cartridges for that chemical as well. Like I said earlier, I've filled blocks in the past and had the best luck using muriatic acid, but I thought I'd ask. Sometimes new ideas come along.

Thanks again.

Re: Hard Blok - Block Filler
 

has anyone used a small recirculating water pump, as in a fish tank or a decorating water fall, to pump muriatic acid over [and over and in, around and through] the block, while the block sits in a big plastic tub?
if so how long will the pump last? they cost about $30 bucks, so ....
also it might eliminate the need to install core/freeze plugs, during the etch process-right.

i want to fill my 327 block just up to the bottom of the water pump holes. i was told that you could put a plastic hose from the top of the filler to the original block drain. not sure how all that would work. has anyone done that?

thanks rod

Re: Hard Blok - Block Filler
 

We got too much Hard Block. If you need some, email me. It will be cheap. Jeff Teuton jefft@southlanddodge.com

Re: Hard Blok - Block Filler
 

Jeff
Too bad I didn't know about it last week. It's already ordered and shipped.
Thanks