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I HAVE A 400 SBC BORED .40 OVER STOCK BOTTOM END WITH NBK HEADS AND MANY PEOPLE SAY THEY'RE CRAP IS THIS TRUE
 

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Hi Jett.dana400, welcome from Idaho. Glad you've joined us. I've been told that the 400 block has a tendency to crack due to thin water jackets. Other than that I don't know.
 

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4 bolt main 400s are crack prone around the webbing if main journals. 2 bolt mains survive as I have heard. I’m looking for a 400 block now😎
 
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