While putting away the last (and I do mean LAST) of the trinkets and parts i have left I stumbled across a few 16LB "HOLLOW" rivet radiator caps that i had found in detroit many years ago. There were no more of the "DOMED" rivet caps left in my stash. This prompted me to question a cutoff period for the 2 stlye of caps. my survivor cars like the 71 rj reynolds cuda and 71 hemi charger both use the DOMED rivet. the diamante which was a very early 70 hemi challenger used a HOLLOW rivet. frankly i dropped the ball from there and assumed most 70 cars used the DOMED rivet. sometimes i am guilty of focusing on minutia and letting something as obvious as this live under a possible false assumption.
so gents.....any survivor cars out there with known build dates that can possibly show a changeover period from HOLLOW to DOMED rivet radiator caps? of course there will probably be some plant issues to factor in.
a respected originality mopar guy emailed me last night and stated that all 1970 cars right up to august 70 built 71's used the HOLLOW cap. any tboughts?
thanks much.....good health wishes to all.
Steven

does anyone have pics of these 2 styles caps,i woud like to see the difference.thanks

Use the above picture as a guide - and not written in stone. even though it's on my site.

raised brass rivet style
http://mmcdetroit.com/ICCA/References/Engine_Compartment/image_06.html
depressed ( hollow) style rivet
http://mmcdetroit.com/ICCA/References/Engine_Compartment/image_08.html

I personally have not seen anything newer than 1970 with the hollow style rivet - but have seen several late 60's mopars with the raised brass style. So I wonder if it's a plant thing

Not that it'll narrow down the date, but I looked through a bunch of '70 road tests & any that were clear could be identified as "hollow".

I found the next three in Super Stock & Drag Illustrated February '71.

'71 340 Duster hollow LA or Hamtramck assembly plant

'71 340 'Cuda Hamtramck assembly plant

'71 440+6 Super Bee domed Lynch Rd. or St. Louis assembly plant

thank you for the input. since road test cars are usually early production cars we have learned something from your investgative work. much appreciated. now id love to hear from the survivor car guys....with cars that were built throughout the year to see what else we can learn.