Report Missing R3! in Avanti Trivia Posted February 8, 2019 Longtime since I've been here and even looked at all the R3/4 data. Comparing old data to some of the latest I had, it seems as though the cutoff region was after B101. My B92 was gone thru by Myers and I have the photograghs showing all R3 specific parts present & accounted for. If I can recall some conversations with Nimesh he was rebuilding B103 at about the same time I was having B92 done. Can't find my specific notes on the phone chat but it seems he was actually casting up a couple of pairs of new R3 iron heads and I seem to recall some talk of issues trying to get custom rods made up. He sent me pics of the B103 rebuild(not closeups) but the heads were certainly the right chamber shape and had larger valves. If he or his brother are still around they could confirm. B101 appears to be one of Nels R3 Avanti's and it was one I took reference pics of since it was a Granatelli Conversion car. Externally it looked correct, don't know about the internals or if he's gotten around to that one yet. Again he'd know best. In the listings I'm looking at, most of the R3's after those two were loose engines or listed as short blocks or having R2 heads. Interestingly B109 was listed as having R5 dished pistons(more accurately a step down). After all these years we still don't have a firm grip on the actual hard number of R3's or R4's, but its certainly not a number above 100. At least a verifiable one. How many are left? again its just a guess but I'd go with 50% as my top number. Just too many open lines on the lists that have never been filled in to make me lean towards a higher number, that and the age of the data.