Re: Engine melt down
3 & 4 run hotter than others=more expansion of piston
pistons set up with too little clearance=scored pistons and scored cyl walls 3, or 4, or both
see it all the time
no matter what anyone tells u, pistons must be clearanced at .0035
this is especially so if using old school long skirt pistons
but we use .0035 even on short skirt 283 style pistons
valve stem may have been slightly off even when new from the sounds of it
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'31 180A
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