Originally Posted by crochunter
There are alot of different rings out there. Some good some bad. Some say dont use Chrome MOly cause too hard on bores. I personally use a file fit ring from Speed Pro.
I use only
chrome moly top compression rings in my engines. Too hard on the bores is BS, IMO. Bores don't last forever anyway, especially when ran hard. The key is in getting the rings fit properly and seated properly. The best way to seat the rings in a new engine (in a car, as opposed to on the dyno) is to get the temperature up to about 230*. The expansion of the materials will seat those rings nice and solid. Way too many people (IMO) run their engines in far too cool. I usually use iron 2nd compression rings.
I use Speed Pro rings and always file fit them. I've used C&A rings and a variety of zero-gap rings, but for my needs, they're not worth the cost. One of the most important aspects of quality ring seal is in fitting the rings and ensuring that the ends are square. Ring seal is very important in making peak power. However, what is often overlooked is the quality of the machine work on the block. Bores that taper or are out of round tend to negate the benefits from good ring fitting procedures. It is absolutely critical that the bores are true, square and perfectly round. If your machine shop can not produce the necessary results, replace them with one who can.