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| | | | Joined: Jan 2008 Posts: 14 New Guy | | New Guy Joined: Jan 2008 Posts: 14 | whats the difference between a 230 and a 250? and how far can you bore out a 230 before you hit the danger zone?
thanks
-chris- | | | | | Joined: Jul 2006 Posts: 79 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2006 Posts: 79 | Hey Chris,
Did you mean to say a 235? If so there are a few differences, like engine mounting points, horsepower, the 250 weighs less, the 250 is a "newer" engine than the 235.
And lots lots more...
If you really mean a 230, then forget everything I just wrote because I've never heard of one of those.
Bluedawg
Bluedawg
God fearing, Gun toting, Constitution loving extremist.
| | | | | Joined: Jan 2008 Posts: 14 New Guy | | New Guy Joined: Jan 2008 Posts: 14 | | | | | | Joined: Feb 2004 Posts: 29,787 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,787 | A 230 has a 3.875" bore (3 7/8") and a 3.25" stroke
The 250 has the same bore and a longer stroke, 3.530". It should be possible to make a 230 into a 250 by swaqpping the crankshaft and pistons from a 250 into a 230 block. I believe the connecting rod length is the same on both engines, but the compression height will be lower on the 250 to make up for the longer stroke. A 307 V-8 piston will fit the 250, same diameter, weight, wrist pin size and compression height, but it's a flattop design where the 250 has a 1/4" dished top.
Either block should take a maximum overbore of .060", but .030" oversize will give a longer-lasting rebuild due to thicker cylinder walls. 60 over engines have a habit of overheating easily.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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| | | | | Joined: Jan 2008 Posts: 14 New Guy | | New Guy Joined: Jan 2008 Posts: 14 | so i should be able to put a 250 crankshaft into my 230 which will make it a 250. thanks thats what i was looking for.
thanks
-chris- | | | | | Joined: Jan 2001 Posts: 662 Shop Shark | | Shop Shark Joined: Jan 2001 Posts: 662 | | | | | | Joined: Mar 2007 Posts: 4,215 Moderator | | Moderator Joined: Mar 2007 Posts: 4,215 | Looks like a lot of the parts are interchangeable, bore and stroke are the same for the 153, the 230 and the 307, they just added a few cylinders here and there. Just grab a part and the chances are that it fits. | | |
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