51UKChieftan Posted April 15, 2019 Share Posted April 15, 2019 Hi Guys, I would like to set the timing on my 51 Pontiac Chieftan Catalina 8. The manual states two settings, one for a standard head and one for an HC head. How do i identify which head is on mine. Regards Joe Link to comment Share on other sites More sharing options...
john hess Posted April 15, 2019 Share Posted April 15, 2019 'High compression' will be cast on top of head just rear of water outlet to heater hose. Most likely be on an auto transmission equipped car. Manuals had 'regular' heads 1 Link to comment Share on other sites More sharing options...
51UKChieftan Posted April 17, 2019 Author Share Posted April 17, 2019 Thanks John. Much appreciated Joe Link to comment Share on other sites More sharing options...
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