who is using hard block or similar in street engine

[crash340]

Hi Team, is onyone using a partial grouted block for a street motor?? if so any issues? I like the idea of a partial block fill with something like Moroso Hard Block, say up to the freeze plugs or at least to the top of them in an effort to give the bottome end some rigidity. I'm looking at having 3 1/2 - 3 3/4" from the deck free for water flow on my 408

[cudabob496]

have to hard block first, before machining, or there will be distortion

[burdar]

I've read that most fillers shrink over time and do no good.(pull away from the internal block surfaces)  Any truth to that?

[crash340]

CB, correct, caps and heads torqued until hard block sets, then machining.Burdar, no clue! sorry, my biggest dilemma is, is it an issue, street driven for cooling etc