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Re: vortec on a gen 1 small block questons.
The Vortec heads are the 062 and 906 castings, not any head that had the "Vortec" name on them.
I did drill a single hole in the thermostat, but I believe that the waterpump has a bypass built in and the hole wasn't needed. (memory from something I read). I know I changed the thermostat and didn't drill it with no issues.
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'86 C-30 dually, 454/tbh400
'73 K-20 350/350/205 (sold  )
I'm kinda like duct tape- no real purpose, but handy to have around.
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