3993820....71......oval...OPEN...402, 113cc chamber, 255/114 ports
6272292....70-78...oval...OPEN...402, 454
I found these results on mortec.com. im wondering whether 292 would be the same 113 cc. I'm assuming so, the heads look identical. At my local machine shop I ran apon a set of 215's, and I wanted to buy them but unfortunately they were customer heads! dang it, oh well. SOO... I bought the mix match heads. for $30 . which isnt bad. The guys at the machine shop were pretty positive they are the same.
I'll post some pics if you guys want of the heads