47FordCoupe 6 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 post Share on other sites
john hess 156 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 post Share on other sites
47FordCoupe 6 Posted April 17, 2019 Author Share Posted April 17, 2019 Thanks John. Much appreciated Joe Link to post Share on other sites
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