Jani,
That is a good question. I did not weigh the new heads before they were installed. The manufacturer says they are less that half the weight of steel 4V heads. I cannot say that I have noticed a handling benefit, but any less weight up front is a good thing. My Longchamp has modified suspension as it has been involved in tarmac rallies, and consequently I get little understeer. In fact, I think Longchamp GTS's handle extremely well, except in the wet with all the power and 11" wide rear rubber!
Stuart
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