60 or 90 degree heads?

[coxfmly]

Hello,
I'm replacing the heads on my 94 suburban with NEW replacements from Clearwater cyl heads in Florida.
They say their heads have improved castings over factory spec heads but they need to know if mine are 60 or 90 degree, not sure where to look or measure for this angle?
Thanks

[john8662]

If you tell them US suburban and they ask you that question, well, they're clearwater...

You've got 90 degree holes.