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I just ordered the 512 kit and heads today from 440 source. Ken told me the 512 was a better choice than the 493 that i was going to go with.The 512 should yeild about 10.25 compression where as the 493 was going to be about 11.5.



Call them back and upgrade to the CNC'd heads (if its within your budget)- otherwise you're no further ahead than using a stock 906!

When you get the heads you'll DEFINATELY want to upgrade the retainers and locks and possibly the springs depending on your cam choice.

Did you get the "balanced" assy. - worth the few extra bucks!

Also, don't be disappointed if/when the pins don't fit the rods ... this is about the only thing that needs attention.