Kelford Cams recommends proven 272 racing camshafts for 4G63 MIVEC engines with a turbo size range of 54-62mm and a horsepower range of 400-650hp. These camshafts offer a broader power band and improved throttle response when using MIVEC.
- Kelford Cams recommendÿ valve spring KVS63-BTK for up to 8500rpm and 35psi of boost.