ORIGINAL: rclynx
but I wouldn't expect you to know that so why don't you do a little research before you go slamming my advise. Oh and I have 3 of those 4 mentioned engines in stock at my shop. How many do you have Nik?
Just having them as stock doesn't really mean that you have any experience with them. Out of the current list, I have 3. Two OS Vspecs, a Novarossi +21-5k, and a couple of SH made engines. Thats not counting the Werks-collari and STS .21t I have.
I have broken-in, tuned, and ran all of these engines. So I think I can say my opinion form experience.