Get the best performance and horsepower for your 4G63 engine in the 400-650hp range with 272ø/278ø racing cams and a 54-62mm turbo size. Using E85 or similar ethanol blend fuels offers even better performance. Boost up to 35psi and rev up to 8500rpm with improved throttle response using MIVEC.
- Kelford Cams suggest using valve spring KVS63-BTK for the best results.