Summit makes a number of headers, coatings , etc. Clearing up, that these are the basic $89 buck headers for a 85 gm truck.
The inside retainer dia must be the same from votx retainer to v6 retainer, or work with the v6 locks. There might be an extra retainer somewhere, if found the measurements will be posted. The seal part number is not on the reciept, but will post that when it comes to light.
For posterity my crap measurements are saved. My spring measurements could not be repeated every time. My tools are junk.
free length 1.94"
Installed at 1.8 they were about 95lb seat and open 275 at .500
Installed at 1.6 it was 125 and 305
To clear up , the safe running lift is not 1/2" , the seal is going to touch. Lifts of .450-.460" cleared on votex heads with seals.