273 Commando Top End Rebuild on my 65 Dart GT

I would recommend using this true roller double roller timing chain. It's one step above the stock 340 double roller.

http://www.manciniracing.com/edelbrock4.html


The stock 273 chains are junk and should have some stretch by now. Install a double roller for reliability and it will also pick up your fuel economy and some performance from the old chain...

That chain can go over 100 k and have less stretch than your current stock chain has now. It can go past 200 k on a daily driver....