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Author Topic:   487 and 487x
posted May 17, 2004 09:57 PM
We just pulled one of our spare blocks out today and one head is a 487 and the other is a 487x. What is the difference between the two?

posted May 18, 2004 06:47 AM
The X head is supposed to have an extra 10cc's in the intake runner.

xx RACER 96
posted May 19, 2004 01:28 AM

The 487x came with 80cc chambers for lower compression. The intake runner is not any bigger.

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