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Then there are other considerations that are just as important such as the type of cast iron. Nodular or Ductile. The Nodular Cast Iron is more rigid and prone to cracking when heated and cooled. Say like taking your hot motor to the car wash and cl...

Then there are other considerations that are just as important such as the type of cast iron. Nodular or Ductile. The Nodular Cast Iron is more rigid and prone to cracking when heated and cooled. Say like taking your hot motor to the car wash and cleaning it. Cracks will happen like magic if you do such with OEM manifolds or all the other reproduction ones.