I like it very much it runs great. I plan on keeping it a long time it has 40k on it now. And I read somewhere that it was only good for 100k. This statement worried me and I was trying to get some answers. If it were not as good as the old cast I might try to get out of . hoping to hear some 200k 300k stories on the aluminm block. I believe it has 2 valve heads.