I have also heard its common from others.. and it says it here too..
http://www.extremepsi.com/store/cust...cat=555&page=1
Quote:
|
Originally Posted by that web sites ad
Because of the many head lifting issues on 4G63 blocks running in excess of 35+ PSI, a stronger stud needed to be manufactured to meet the demands of today's top engine builders and racers alike.
|