Re: Food for thought


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Posted by hemimech [71.10.56.36] on Thursday, January 07, 2010 at 20:20:59 :

In Reply to: Re: Food for thought posted by David Sherman [216.18.131.28] on Thursday, January 07, 2010 at 02:45:18 :

Keyword in your statement “the gap can be filled by the oil film” Indicates to me an increase in oil consumption and valve deposits. Excessive oil getting around the oil control rings will cause a hydraulic pumping action between the upper rings that intermittently cause the compression rings to loose the tight seal against the cylinder wall. Loss of the seal will increase blowby, that in turn leads to increased engine wear.
Let’s look at some real world short block rebuild numbers; 230 Piston from Rock Auto $38.00 X 6 = $228 Machine shop bore& hone average $20-60 per hole =$120-360. Add $60 for a professional hot tank to remove the years of oil sludge. Also $80-$100 for a good valve job. Your already going to have purchased all of the gaskets and seals to do a simple ring job so those cost remain fixed. So realistically we are looking at an additional $500-750 investment to ensure a properly repaired short block. Obviously there is the extra labor time to pull the short block out of the truck, but it’s a labor of love right? I realize some budgets might not allow this and that some trucks might not be worth the expenditure. But for a restoration it seems a bit odd to spend years going thru axles, transmissions, t-cases only to short cut the engine rebuild. To me peace of mind comes from knowing the condition of the cam bearings, that all of the oil passages are free from oil sludge and that the freeze plugs are not nearly corroded through. I agree it would be nice to see performance results on a build w/old clearances vs. what we can build them to today.




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