as far as i can tell there isn't any outside differences between the 324 casting heads to tell if one has the 1.60 exhaust valve or the 1.74 exhaust valve, so the only way i know a person can tell the difference is pull the heads and measure the exhaust valves
All 300 with crosswhat size is the exhaust valve?
all300 with 413 cross ram are 1.75 ex valves so yes you are looking at the right heads for a 343 hp or a 300J carwhat size is the exhaust valve?
1.710 EX 2.060 int.All 300 with cross
all300 with 413 cross ram are 1.75 ex valves so yes you are looking at the right heads for a 343 hp or a 300J car