Chainsaw Repair

Well, I shopped around and couldn't find that 353 pro model, the size class that is in has several configurations but all at a price higher than the 455, one thing I couldn't find was the crankcase construction material, are they all plastic now? But first I broke down my old engine and checked for replacement parts, prices all over the map from around $50 for Hong Kong parts to about $200. for OEM, figuring total cost to bring mine back to "like new" condition didn't make a lot of sense, so ordered a new 455 on ebay, on the plus side it has 3/8ths chain (I still have a new one from my old Pioneer 3071) from years back, So, finally, I have to thank you folks for putting up with some stupid questions without choking your chew. I hope I like my new plastic tinker toy.