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Finally. Rebuild time
https://www.slantsix.org/forum/viewtopic.php?t=66277		 Page 1 of 1
Author:  tattoosteve99 [ Wed Nov 03, 2021 4:48 pm ]
Post subject:  Finally. Rebuild time
So I’ve finally found a good shop. Word of mouth can make or break a business as well. I have a 78 225 that im going to build. That said I want to bore it a standard .030 over. So with that, can I reuse the pistons and just go with larger rings or get bigger pistons? As well im decking the block .100 and the normal cook/clean magnaflux and having it line bored. Im not building a race engine at all. Just adding a little more ump ya know. What other improvements to the block can be done, if any? This will be a slow process once the block is back considering im the only one I trust enough to do this. Thoughts ideas?? All welcome. :D
Author:  volaredon [ Wed Nov 03, 2021 5:27 pm ]
Post subject:  Re: Finally. Rebuild time
NO you can't bore an engine and use standard Pistons.
On the block shave you also shouldn't shoot for some number pulled out of the air. 30- over may or may not clean up the bores. But if you don't need that much you can get 20-over pistons and rings. Who made the determination of 30-over and 100 thou block shave? Is the engine apart yet?
Author:  Rick Covalt [ Wed Nov 03, 2021 6:50 pm ]
Post subject:  Re: Finally. Rebuild time
Quote:
Just adding a little more ump ya know
Then I would not spend the money on line boring. It is not really needed for what you are doing.
Author:  and739 [ Thu Nov 04, 2021 8:58 pm ]
Post subject:  Re: Finally. Rebuild time
Quote:
What other improvements to the block can be done, if any? :D
Check out “Best of Doctor Dodge” on the Engine FAQ page.
https://www.slantsix.org/forum/viewtopi ... 19&t=38446
Lots of good engine build info with links to other threads and articles.
Author:  tattoosteve99 [ Sun Nov 14, 2021 11:36 am ]
Post subject:  Re: Finally. Rebuild time
Quote:
NO you can't bore an engine and use standard Pistons.
On the block shave you also shouldn't shoot for some number pulled out of the air. 30- over may or may not clean up the bores. But if you don't need that much you can get 20-over pistons and rings. Who made the determination of 30-over and 100 thou block shave? Is the engine apart yet?
Engine has been apart for some time. It’s factory and has never been touched. .30 is usually what I go for as that has the most parts , ie, 10 20 30 etc and so on. 100 off is what I’ve heard works well but I will inform the machinist not to let that be the case if the piston will protrude. These are all just estimates so far
Author:  volaredon [ Sun Nov 14, 2021 3:26 pm ]
Post subject:  Re: Finally. Rebuild time
Again you can't just shave the block "some random number" as you now propose with your "take .100 off" comment.
And while a crank rods/mains can definitely be machined 10-thou (0.010") on a car engine I have never seen 10-over rods or Pistons available for anything. On a single cylinder air cooled engine, yeah, all the time.... but never on a car/truck engine.
On the other hand I have never been a fan of "straight to 30-over" if a block wit clean up at 20. This has been the source of more than a few arguments between me and a couple of different machine shops about this/ "would it have cleaned up at 20?" And they came back with "we never tried, we never go less than 30"
That's why I was quite surprised when this place, when they called and asked if I had my Pistons yet so they could finish hone it, when I asked what size Pistons they said "oh, only 20 over"
I never bore an engine any more than necessary.
I don't need them now but now that I brought it up, someone on ebay right now has a set of 20 over Pistons and Rings for $75 for all. Pretty reasonable I think.
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