Join Date: Dec 2012
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Number 6 runs hot due to it being the last cylinder to get coolant and the other 5 have already heated the coolant up, it's the nature of a inline engine. It's normally not noticed until more fueling is added and their loaded for extended periods.
Years ago we had the same issue with the 401 engine on 8000 Ford tractors.
They ran fine from the factory, but if you turned the fuel up a little for more power it would score #6 piston.
The simple fix was to hone that cylinder .003 over giving more room for piston expansion.
When I rebuilt my present engine I had an extra .003 honed into #6 cylinder.
Towing heavy with my fueling mods I knew #6 was going to heat up.
OP make sure to check the piston cooling nozzles, their a big part of keeping the pistons cooled on these engines.
Mine-04 F-450 SCFB 4X4 drw,5.9 12v 215 Ppump,ZF 6,KYclutch,KDP fixed,gauges,5x12's,15deg,3k GSK,60#,AFC Live, Super B single,Pusher intake,D celebrator brake,07 coil spring front conversion.
Her's-18 F-150 STX SC, 4x4, 5.0
Toy- 64 Fairlane, future 406FE, 3 Holley 2bbls, 4 spd