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Tool Talk Discussion Forum

Re: Mistaken Identity... 305 vs 350 SBC

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dr sportster

03-04-2013 12:03:06
173.2.32.148



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I wasn't going to comment on this .After reading it a few times I will give advice[needed or not hehehe] If the ridge is that noticable you may need new pistons as it is worn past spec. You would mike the cylinder in various spots and record the measurements. If using snap gauges you mike several times and look for repeatabilty. If you don't use plastigauge on the lower end you don't know where you stand [mics are nice but plasitgauge is reality- and inexpensive] . Don't try to hone +.010 - too far to stay accurrate- have block bored{ I have a Sunnen dial bore gauge to confirm this]. If the hone does not clean up the bores [touching and refinishing entire bore] then some oil may pass in those spots.Yes you can reuse the pistons and just rering but you must consider rings seating. To hit entire bore with cross-hatch in that case use a dingleberry hone.[Now your adding cost for tools.] In some cases where a young guy gets an old lady's car and rerings but leaves too much ridge then revs the motor more than it was run at -the rings will break when the rods stretch a bit and allow the rings to travel up and get broken by the ridge where the cylinder narrows. The only other advice is ridge reamers have done alot of damage .For me I like to just favor the top of the cylinder with the hone until the ridge is gone. One to not buy a ridge reamer and two to not cut too much.What ever you do don't leave any of the bore glazed . Sand paper and hand finishing is better than glazed walls. I understand you are doing an econo rebuild but the bore is kind of critical as is the lower end clearance. Check the rods for any nicks visually[without cost worry they would be magnafluxed]. Most engines failure is connecting rod failure as this is by far the most stressed part The part about knowing what you have before ordering you will not forget so I won't elaborate on that.
Put that Chevy engine ID site in your favorties.Nothing is more pleasing than starting a rebuild you have done yourself[okay almost ].

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