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Old January 1st, 2019, 03:29 PM
massey478 massey478 is offline
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Join Date: May 2013
Location: Warsaw, IN
Truck: 1969 4000 ToroFlow, Massey Ferguson 1100 with a 478, Payloader with a 305, all adapted in my shop
Age: 77
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Default Re: stumped! any ideas?

Did you have the heads checked for flat? Ken has good thoughts about overheating at some time in its history. This is a typical blow-out area I saw several times in the GMC shop I worked at.
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