So a "U" head is a T/A head! Thanks. I admit I have never worked with or even touched a T/A head. Is the only difference between an X head and a T/A head the valve guide angles. Like I said, I've never really messed with them.
894 heads are X heads only with only 2.02" intakes. They are a different casting, but similar specs to 915. The pushrod holes were machined differently in the T/A 915 heads to accomodate the offset rockers. LA engine guides are all the same.