702, clogged nozzle? Just one piston burned up leads me to think your down nozzle was way to small for that cylinder. Upper nozzles run large in front to small in back, 10 nozzles with the last 2 just sealing the rotors, 40% upper, 60% lower, looking for 1150* at top end of track, lower nozzles staggered as needed to balance the temps. 540 Fat Head motor with a 14-71 Superman.
702, clogged nozzle? Just one piston burned up leads me to think your down nozzle was way to small for that cylinder. Upper nozzles run large in front to small in back, 10 nozzles with the last 2 just sealing the rotors, 40% upper, 60% lower, looking for 1150* at top end of track, lower nozzles staggered as needed to balance the temps. 540 Fat Head motor with a 14-71 Superman.
Sometimes it's hard to tell, but we think it spit a valve seat first. I did find a destroyed nozzle, but I suspect it was collateral damage. I was able to install a new sleeve while it was still warm, then yanked the block for a thorough cleaning. As you can imagine, there was aluminum piston pieces everywhere, including inside the intake. New head, couple pistons, back in business. Being a low budget TA/FC program isn't easy, but it's fun.