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I'm trying to help a buddy of mine who wants to put together a 4" stroker with a 340 stock block. Plans are to put in 4 bolt mains and 1/2 fill the block. Probably 0.030 over as well. This will be using W2 heads. Is this block going to hold up or not? Trying to keep this on budget and an R block is not in his budget.

I'm doing it. No dyno #'s on the motor, but based on car weight, speed, ET, I'm guessing around 650HP. 360 stock block, 1/2 filled, 4 blt. Milodon caps. Motor in a blown application.




And from what different engine builders have told me that is pretty much the cap on hp on a factory block and it actually live for very long. I am just going off of what I have learned and heard.

same here, and I don't have the money to test it and find out. if you can't build it right the first time you probably don't have the bucks to di it again.