The Silvertop con-rods are very solidly designed and with bolts weigh in at 506 grams each (without having bearings). The Blacktop was equipped with thinner, lighter and weaker rods that happen to be 485 grams each. Equally are easily interchangeable and use the identical fasteners for the principle bearing cap, https://4age-20v-itb94825.blogpostie.com/53192569/the-ultimate-guide-to-toyota-4a-ge