If you get time, read this article...about half way down it talks about a 5 cylinder 4t engine running 20,000 RPMs in early to mid 70s AND how the 2t was coming into the picture with its performance and low cost .. So much for the smack about the modern 4t engine of today ... U gotta know the past or U will always be played in the present... http://www.mcnews.com.au/Columnists/PeterIngley/2010_10_Nov12.htm