My aluminum fly is also just a tad north of 11 lbs. too. The stocker is close to 25 pounds, I believe.
When I switched, I noticed no gains in the 1/4, however I only got to race it once with a horrible 60' time of 2.2+ - so it's difficult to say with any degree of certainty.
Any loss of reciprocating weight is a good thing. The 'loss' of torque that some people talk about, well, I didn't notice anything significant.
With my 331 build-up, my crank is now 55 lbs, so the aluminum fly helps to bring down total reciprocating weight - we'll see.
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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