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Message: <blockquote data-quote="GDTrumbo" data-source="post: 533757" data-attributes="member: 10665">OK. Back to this.... Stroke DOES matter. You need to go to Sean Hyland Motorsports website or somewhere and find out what direction the keyway on the front of the crank points when # 1 piston is at TDC before you even turn the crank by hand. There is a "safe zone" where the heads can be installed and there is guaranteed no piston/valve contact anywhere. I think it is like 10 o'clock to 2 o'clock. Then there is TDC. If your at the top of the exhaust stroke, engine destruction will ensue. I have read of many expensive mistakes done right here. Do a search on this site (I think it's a link to Stangnet or something) or Google Sean Hyland Motorsports. I wouldn't buy anything from him but he is a master with the mod motors. He has some good articals on his site that cover timing these engines. Read closely.You may have to perform this operation again. Good Luck.GT</blockquote>