"It's the smae scenario with a block. It needs to be solid or it will flex. The it will crack and fail."
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Do you really think any block doesn't flex? Even a solid moves. Heat up a bar to 150 degrees, mic it, let it set in freezer awhile ,mic again.
I guess we throw away all of our 440-400 blocks because the "powers that be" have said 600 hp is the limit. Now we just go buy the 5 grand nonexistent blocks laying around. I have zero money in mine so after 1grand machining I got maybe 200 runs so I do each one till I get up to that 5 grand block(plus the machine work it has to have). So that's a thousand runs to how many does the big money block have in it. Any real race engine is a ticking time bomb. So cost effective, don't think so