Okay, thank you all for all your insights! You all have been of much help.
No offence has been taken from any comment. I'm all for learning. It is one of the reasons I posted. I didn't want to make a mistake. And something was worrying me about the engine, so needed more knowledgeable expertise.
I'm sorry, I'm at work and keep getting distracted before I can reply back and more people have commented. It blew up a lot more than I had expected.
Thank you again for your feedback and I will sit down tonight and have a proper look through the comments.