definitely go with the LS series motors. more bang for your buck and much more torque! (gobs of it in fact!) then get yourself some better rollers and springs (and some other components) and you can rev that bad boy to 8500 RPMs now THAT is a scream.
The ad says they lowered the compression ratio to 9:1. I wonder what other work they've done internally. It may not neccessarily be a blown motor in waiting.
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2004 550 SE #1081 of 1953 (sold)
1997 911 Targa (sold)