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is there any special high dollar block work needed when making a 408-427 motor, also will the 4.250 cranks fit in a stock block or is a 4 inch the max?
 

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A guy I know had a 418w built a few years ago, and the only thing I remember being done to the block was grinding clearance for the rods near the pan rail.

It was a 79' block, Eagle 4340 forged 4.100 stroke crank, and 6.200 H beam rods.

Not sure if a 4.250 stroke crank will fit or not...
 

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The I-beam rods that came with the stroker kit from fordstrokers didn't need any grinding for the block, I've used link bar lifter$ in 89 block for my custom roller cam.
Not sure about the 4.25 crank.
 

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No high $$$ work needed, just the normal bore/hone with tq plates, notch cylinder sleeve for clearance if needed with your rotating assembly, etc...
I'm running 4.17 crank for 427ci in an 84 windsor block with a girdle. I do believe my block has been notched.
 
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