can the valve seals be replaced w/o removing the heads
valve seals on 1993 Toyota 4Runner
Yes, I have done it on a few vehicles, but it is a VERY, VERY delicate job for a Pro. You need a very reliable way to keep the cylinder pressurized with air and the crank shaft and camshafts to be held in a locked top dead center position for each cylinder as the valve seals are replaced. Of course you need the proper valve spring compression tools.