This is a 20 year project due to work and other life gets in the way stuff.. When I assembled my engine back In 2000..I used some single valve springs for break in @ the direction of Hughes Engines. So following the first hour or so of run time I was called away to work. Never installed the proper springs. Engine idled well and had zero vibrations, revved like a sewing machine, internally balanced with hughes stage 3 heads and 3038al cam. Car sat for a long time till 2017. When I picked up the project again and over the last year or so been battling a crappy running engine, I was checking obvious stuff, plugs, wires, fuel etc.. checked the pushrods and found bent intakes on #5 and #7.. I am running zero deck height kb107 pistons and iron heads with 62cc chambers, I think we figured about 10.8 compression more or less. My son and I were tearing down the 360 in the dart this evening and I think we found the cause of the crappy running engine.. cylinder 2 and cylinder 4 were fubar.. this engine to my knowledge had about 5 hours total on it.. I couldn’t figure what happened. My son was 16 back when I built the engine, and I left the car to go to work out of state. When i saw the damage tonight and gave him my best WTF dad look, first thing he says.. “Me an Rob only raced it a few times at hot august nights and around town, can’t we just get a couple pistons?” I asked him how many was a few and he says about 3 months or so.. I could see he was pretty nervous, so I let him off the hook for the most part..