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Old 10-14-2002, 07:34 PM
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Post 283 to 302

I have a 283 (3849852 - DN) chev which I believe has (thick cylinder walls) and have been told they can be bored out to a 4 inch bore which makes somewhere around 302.CID. Has anyone heard of this being done and will the motor run hot? Could it be bored to 4.020 or 4.030 for use of cheaper oversized 302 pistons? Any info greatly apppreciated.

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Old 10-14-2002, 07:41 PM
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the 4.000 inch bore is shared by the 327 and 350 with different cranks all sbc are the same block with different bore and strokes.
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Old 10-14-2002, 07:42 PM
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Search this on here cause there was a post a few weeks back about this.I think you get a 301 when you do that.
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Old 10-15-2002, 02:51 PM
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I would check for core shift before boring a 283 to 4". We used to do it all the time...way back when. But you do run a chance of failure. I don't remember overheating being a problem.
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Old 10-15-2002, 07:17 PM
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blocks are not all the same. 1967 and earlier are small journal. 1968 and later are medium journal and the 400 is large journal. all you need to do is find a 1967 or earlier 327 block and install your 283 crank with the 302 pistons. simple non-production 302.
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Old 10-15-2002, 07:20 PM
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btw all 283's are small journal and most have a forged steel crank.
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