I installed a Snow dual nozzle kit on my 421 just before Drag Week back in '06. The new heads (my current ones) had just gone on the motor and the compression ratio was now 11.4:1. The plan was to run the mid West's finest 93 octane pump gas and the WM injection. We started the first day and ended up a few tenths behind the class leader. In an act of despiration, I turned off the WM and went a tenth faster. It just turned out that the combo was safe enough to not need the extra protection, and I may have been spraying too much mixture to boot, but there is only so much real estate inside of the intake manifold. That and the fact that water doesn't burn. Mine just didn't need it or benefit from it.
Your higher CR may like it over what I had.
End of Drag Week story: front shock and rear tire pressure tuning gained us another few tenths and eventually gave us the small block NA class win!
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Brian Rock
'65 GTO - Pump gas 496" IA2 w/ High Ports, 200-4R trans, 3.73 gears, 275 Hoosier radials, and 3925 lbs.
9.88 @ 134 N/A on Cali 91 octane.
http://www.youtube.com/watch?v=NJEIY5OJ68g
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