No, is 32 bit only (Checked with sudo ditto sudo ditto --arch x86_64 /Volumes/Lion\ HD/mach_kernel /Volumes/Lion\ HD/mach_kernel_x64, it didn't gave any output)

64 bit is harder to get it working properly, because of all the dyld/sysenter/syscall stuff.

Thanks R:A:W:X86

PD: With your kernel, is necessary to have the 10.7.3 AppleFileSystemDriver.kext??? Are there the new kernel symbols???

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System

• MoBo: MSI K9N2GM-FD, Chipset GeForce 8200 (MCP78)
• CPU: AMD Athlon 64 X2 5200+ @3,02 Ghz
• RAM: Kingston 2GB DDR2 800Mhz + Corsair 2GB DDR2 800Mhz @747Mhz
• VGA: EVGA 9800GT SSC
• HDD: 300GB WD SATAII
• Optical Drive: Sony SATA 24X
• OS: Vanilla Mac OS X Server 10.6.0 + Nawcom ModCD, upgraded to 10.6.8 and Windows 7 x64.

Everything works, except sleep, so system isn't Energy Star compilant .