Got a more specific link? I have ALWAYS heard the 427 was just a newer version of the older blue-headed Mach 26 that came in the LST1...
The LST2 was always marketed as having a .26 too.. Never saw an ad featuring a 27...
EDIT - Aha ..
http://www.losi.com/Products/Feature...rodId=LOSR1002
Hmm....
DOUBLE-EDIT.. Looked at losipartshouse, ebay.com, etc.. And sure enough, they all say "Mach .27" engine... So IDK.... [sm=confused.gif] I always just listened to the forums instead of the manufacturers..(and to be fair, the manufactureres are not exactly trustworthy when you consider for ex. HP claims...)