Originally Posted by BMRLVR
The RD Sport engine uses a larger bore and longer stroke, this engine is using a stock bore and longer stroke.
A flat plane crank would require new cams, completely new software and lots of R&D to make it work properly for a street driven car..
Thanks for the info.
I figured RD bored it, but from the discussion here, it seems that it's a big deal to bore this engine.