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The basis for our Gen I challenger was a well-seasoned 400 small-block core, which Coast High Performance clearanced for a 4340 forged-steel crank working 6-inch rods through a 3.750-inch stroke--a combination Coast High calls its 406ci Pro Mod short-block.
Chevy Small Block Dyno Tests - Old School Meets New

The basis for our Gen I challenger was a well-seasoned 400 small-block core, which Coast High Performance clearanced for a 4340 forged-steel crank working 6-inch rods through a 3.750-inch stroke--a combination Coast High calls its 406ci Pro Mod short-block.  View Related Article

 

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