[jbird76]

I was reading about using a block filler for my 350 block (will be a 383) as it strengthins the block. I read its good to do on a street engine up to the freeze plugs and it can add a minimal amount of HP. I asked a couple people about it and they didn't seem to know too much concerning it.

Does anyone have experience with it?(probably a dumb question)

Does it really do much to help or hinder?

 

[joespanova]

My blocks are always poured as its a cheap way around an aftermarket block.....use Hardblok and go for a short fill for the street or a tall fill for racing.......if you sonic the bores on an OEM block you will find that they are fairly thin and can use all the help they can get........esp if you get any significant core shift ..........so, I would recommend it