Question on heads!!

[4thgentruck]

Bought my 400 sbc motor today and started to tear it down . Im wanting to find out if these heads are any good. 3998997?

And also the other numbers are 118 gm 32 on one head and 120 gm 34 on the other does this make them diff.

 

[Boone83K10]

depending on what year those 997s are will determine if they have hardened seats or not for unleaded gas.

72s do not, 73s do.

As far as performance, general opinion is they are a good head.

76cc chambers with 1.94/1.50 valves.

 

[4thgentruck]

So the are the same head the other number dont matter? . And the have a 72 stamped in it also. So is that the one that can run unleaded.

 

[4thgentruck]

What size cam could i go with it has one in it but i wont have the numbers till tomorrow i didnt have the harmonic balencer pully. Ill be topping the motor with a tbi from a 454