Filled Blocks
Seeing if this will work in a street driver.
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http://www.piersideparts.net/MB9292.html
I know it's a costly measure, but I would pin the mains if you want to sturdy the bottom end up and more than they already are.
That's pretty much the end-all to any cap walk with a stock cap and block. And unless you're running a ton of rpm, or something more than what a typical forged H beam and forged 4340 crank will handle, I think you're giving up streetability and over complicating things in the engine bay with a filled block.
$400 for pinned mains
$75 to fill a block. How much for a bigger radiator, oil cooler, fan, and lines?
Then offset the extra 30lbs with lite weight parts, and you're far beyond the $400 to pin the mains and arguably still don't have a block that's as strong.



