Bore an engine is not a simple mod either. Not to mention the 426 Hemi and any of those other engines aren't as powerful as your thinking. Engines were measured as gross hsp rather then net, which results in the numbers being larger then they are compared to what we have today. The hsp of the new gto would be very close to that of the hemi your touting.
And as for GTO can't run a 13.5, what are you basing this on? If the car stays relatively similar to the preproduction version(which its supposed to), the car weighs close to the same weight as an fbody and has more hsp then an ss. An ss runs a quarter in a 13.2 by the way. Aerodynamics may not be as good, but they aren't that horrid. Furthermore, I love how you would make such an assumption before anyone other then gm engineers have driven the final product.
In fact, according to the OFFICIAL numbers already released by gm:
5.3 sec 0-60 with the 6 speed manual
350 hp 360 torque
Another one of the designers is quoted as saying expected runs will be less then 14 secs in quarter.
base price 32,495 including destination charge.
source is gto.com- which is a gm corporate web page.
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