Re: Compression ratio of 327 head; year of the engine block?

Posted by Jack Vines On 2017/3/18 11:16:12

Let's look at it another way. For many years, all exhaust valves have been stainless steel, but when unleaded fuel became the law, the OEMs began induction-hardening their exhaust seats to prevent stainless exhaust valves from micro-welding to the seat, pulling away one molecule at a time and eventually causing recession.

jack vines