They were originally run with twin plugs in a Volare that ran 8.0 @ 160 but later they plugged one set of holes & ran single plugs (with no noticable loss of power!)
Loren Zeedyk of Dragway Automotive (& Zeeker) did a lot of work developing some of the first Indy heads (wedge I think) with Russ from Indy. Loren also used the Volare as a test mule with Joe Liberty in the development of the Liberty 4 speed & I now own the heads that were on the Volare at the time & intend to put them to good use in my SS/DA style car.
