Somewhat throttle to 50 % throttle is not any issue and won't give vibrations btw. I'm undertaking 28 mpg max now with effortless driving and at times reving to max 7k, but only occasionally! The Silvertop con-rods are very solidly built and with bolts weigh in at 506 grams Each https://emilej528qka4.jts-blog.com/profile