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stock 440 steel crank ,stock ly rods ,liter pistons could handle 600hp no problem not even working the block.i think if i built a small block that level it would be aftermarket stroker crank possibly steel crank scat rods. that is the price difference.but my 440 build i used scat rods i got off ebay brand new 180.00 dollars.my machinist really had to cut on the crank

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If you want to go the "stroker route" (increase displacement, torque and lower peak rpms) great!!
Good streetable hp/torque for street and strip. You can, rev up to 7k (reliably) and rely on the induction system/cam/cylinder head combo to make power. A "proven" method by the now-defunct
Modified Production/Modified Eliminator NHRA class in the early to late 70's. Was a great class for
smallblock cars!!