Hmm an LS/VTEC with a blower running at 600hp... for only $4000..??
A full buildup from the ground up was part of that? I seriously doubt it... Here is some pricing to help you see why...
JRSC Blower Kit - used around $3K or so...
LS shortblock - used $300 (and this is a good price)
GSR Head - used $1K built
770 Injectors in order to fuel that kind of HP - new $100 ea
Block resleeve to handle the power - $1K
Rods - $500
Pistons - $400
P/P on head to flow the required air - $900
Balance crank to handle the power - $150
new oil pump gear cause the honda one woulda blew up - $200
Kamakazie header to flow that kind of combustion - $300
Endyn work to the blower to be able to pump that much air - $1500
Should I go on?? If he is selling a 600HP motor for $4000 and has the dyno charts to prove it and someone that KNOWS what they are looking at says its good then it might be worth buying...