Quote:
Originally Posted by Mark O'Neal
The 3.000 Windsors get cap walk when you get much over 6,200. The Cleveland mains are fine....but it's no longer a Windsor block.
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I agree, as a whole, the factory blocks can often be found lacking. It seems it's a craps shoot though, as to which one will fail. I've seen 600+ hp factory block 347's and then I've seen 500 hp 347's split down the middle.
I've seen a few guys running 3.85" and 4" strokes on factory 351W blocks turning some rpms without issue, but I think the general movement for performance oriented builds has went toward the aftermarket blocks.
I was trying to remember if I had built any factory block Windsors turning some rpm, but none come to mind. They all are aftermarket block builds.