Basic “vanilla” heads used in 1986 to 91 carbureted and TPI 305 engines. Valves are 1.84/1.5 with 58cc non-swirl chambers. The carbureted version was 170HP (Engine Code H, RPO LG4) and the FI version was 190 (Engine Code F, RPO LB9). There was also a 215HP version with a better cam available in certain rear axle combinations (RPO G92 w/5 speed manual).

As I recall, the dish is so deep that there is no need for valve relief in them. The CR was rated at 9.3:1 for all 305 engines in 1987.

Regards,
Glenn