speedxl what is this refference manual you have?where do you get it? it is something i would like to see.i am a certified tech as well. but its Mercruiser marine engines and sterndrives,so as i am also aware that engines do not need flywheels,nor do flywhees have anything to do with compresion(i couldnt resist Pitcrew ) but as far as structural strengths and other automotive topics i dont know all that much. so this book sounds interesting.