Titanium retainer, strengthened valve spring, high carry camshafts and strengthened stem seals upgraded to maintain significant-close performance The bore and stroke from the RB25 block is 86mm × 71.7mm, and it had been based on the outgoing RB20 block. The pistons and rods have been also derived from the RB20 https://grahams492ule8.bloggerswise.com/profile