We have recently added a new bore size to Tomei’s forged piston series, which has received very high praise from engine builders and engineers at tuning shops in Japan by RSE and around the world. The new bore size is oversized by 0.5mm. This is a smaller size compared to our current 1.0mm oversized lineup. For example, RB26’s standard bore size is 86.0mm, and Tomei’s current piston bore is 87.0mm. This time, we have added 86.5mm pistons, which are oversized by 0.5mm from stock. Due to the smaller bore, the displacement is slightly smaller at 2598.6cc for the 86.5mm model than the 87.0mm model’s 2628.7cc. Still, it is very difficult to obtain new cylinder blocks these days, so we have added 0.5mm oversized pistons for those who want to use the precious cylinder block with care and who wish to maintain block strength. Of course, those aiming for the ultimate power can still choose the larger bore of 87.0mmpistons. This time, Tomei would like to increase bore options and help engine builders realize the ultimate engine they are aiming for. At the same time as the piston kit, a new bore size has also been added to Tomei’s stroker kit. We hope that you will complete the ideal engine that suits your purpose and enjoy your car life further. 1