Hi,
I've also not heard of a 16rg either. As far as i know in the "r" series engines the only twin cam engines were the 8rg and the 18rg. The 8rg later became the 10r(the g was left off but still a twin cam) Check the build plate of the car it came out of to confirm if it is a factory thing or not. got a funny feeling that the heads may be interchangeable, but there would be a need for different pistons as the 16r head shape wasn't a hemi combustion design. I also think from memory that the 16r was 1.8 or 1.9l so compression will be down too.
Some pics of the 16r are here.
http://www.toymods.net/forums/showth...6rg#post692019
Get some pics or something as i'm interested in it's origins and good luck
bEn
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