How much HP from SBM ProComps? Well... 670HP!

OP makes 8 passes, lifting on 4, is sorting out a new combo, provided a guess of car weight, no DA info when the car was run, and lots of folks throw the engine builder under the bus.
The first day at the track was the shakedown of new engine. He went on to say the best pass of the SEASON was 11.15 @ 122 MPH