No head work just the tybe b cams , not 100% sure on comp but would suggest close to std the engine was build when i bought it by boostworx in sa , i bought it from kris on sau who bought it from previous owner who had it build , although it only had 5k km in 4 years put on it ! ( it was just a hi octane rebuild kit done on it ) it was stock when i got it just the motor was done i did turbos , cams , etc , etc , etc , cant wait for e85 comparison oh and dont forget to get those addaptors Jez !