can anyone out there tell me anything like about a set of big block heads I have
the numbers are 3917219 truck gm1t thanks

Here is what mortec has them listed as. I dont know if its acurate though.


3917219....68-85...oval...OPEN...366T, 427T

They are heads used on the 366/427 truck engines from around 68 to 86. They are an open chamber head.