Posted by Gearnut on September 29, 2007 at 07:48:21 from (68.40.55.114):
In Reply to: Re: C301 block posted by the tractor vet on September 28, 2007 at 21:05:46:
Tractorvet, thanks for your reply. I completely understand the concept of boring-over vs sleeves.
But what I'm asking is do you have first hand personal knowledge of the topic at hand. ie: you've measured the wall thickness, or you have gone through some other measuring process to verify wall thickness (sonic testing for example) and have done the same on a 263 for comparison ?
And here's the reason I ask. If I were the engineer on the original casting, I would make all castings the same (say 3/8 wall thickness) and during final machining, machine the bore for a 301 and if it's a 291 or 263, either find a sleeve with a OD that matches the 301 bore or simply set the final bore to whatever the closest sleeve OD is available.
Given that, you could do the sleeve/piston replacement as often as needed, and bore the 301 once (.030) or twice (.060) before needing sleeves at some future rebuild.
Now it is possible they needed to "reduce" the casting wall thickness on a 263 for cooling reasons, ie: too much total thickness between the casting and the sleeve for the heat to transfer... and that could answer why (if it's true) a 263 has a smaller outside diameter cylinder casting.
Once again, I'm looking for "personal knowledge" on the subject and if your first reply was one of personal knowledge, just state the fact and I will thank you for your time and go look for a 301 block to bore out instead of wasting my time with a 263.
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