Re: flat head longevity


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Posted by Kaegi [71.227.129.92] on Tuesday, March 01, 2011 at 13:39:51 :

In Reply to: flat head longevity posted by clueless [201.202.24.94] on Tuesday, March 01, 2011 at 10:43:30 :

the most I have put on one was about 65K after a rebuild. it ran just as good as when it was fresh. they key to getting high miles out of any flathead is removing the head every 15 to 20 K and cleaning all the carbon build up off of the pistontops, valve tops and the combustion chamber. flatheads dont burn the fuel completely so the build up is fast. Then that carbon gets down into the rings and destroys them, compression starts to go down, oil consumption goes up. ON the truck I put the 65K on I think I only pulled the head once maybe twice. But 25 K is a gross underestimation of the technology. the crank shaft is forged, timing chain and gears are all metal and huge, oil pumps are high PSI, block material is very high quality even by todays standards. cleaining the carbon out is the key. SErvice stations sometimes had special walnut blasters set up to blast the combustion chambers thru the spark plug hole. it would blast and suck out the shells and carbon at the same time. Another reality of underestimatiion is if any vehicle back before digital odometers ever hit the used car market it absolutely got its miles rolled back by the dealrs. over and over and over again. Even now days the Russians hook up the new digital ones to a computer and roll those back. Like when I bought my first car, 64 impala, I actually believed the miles were accurate. NO WAY.



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