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Max 4g63 bore???

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Old Jun 6, 2005, 07:50 PM
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Max 4g63 bore???
what is the max possible safe bore for the 4g63?
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Old Jun 6, 2005, 07:55 PM
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88mm is probably the biggest and safest. good luck.
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Old Jun 7, 2005, 07:29 AM
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Originally Posted by WHTEVO
88mm is probably the biggest and safest. good luck.
im from the honda world so i dont know much about the structure of the 4g63 block.

is 88mm still safe for high boost and streetability? does anybody have a picture of a 4g63 bare block?
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Old Jun 7, 2005, 12:02 PM
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88mm seems a little large to me. Do you have direct knowledge of that? That would be like a .118" overbore and the most I've ever heard of in a 4G63 is .060" (almost half what you said). only sells 4G63 OEM pistons at .5mm and 1mm oversize, so take that FWIW. I thought the .060" over was a lot when I heard about it, but I would definitely get some second expert opinions on that 88mm

If you want safe and reliable, I would stick with what is safe and reliable: .020"-.040" overbore or a stroker kit if your goal is to add as much displacement as possible.
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Old Jun 7, 2005, 01:09 PM
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.060" sounds about the highest Ive seen

9:1 0.20" J&E's are nice...
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Old Feb 23, 2009, 12:09 AM
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Anybody find out yet?....lol. Its only been4 years.
I may do the .060 due to a blown piston that damaged the block wall. Any input would help.
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Old Feb 23, 2009, 09:03 AM
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There isn't an answer. These are sand castings and they will vary.
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Old Feb 23, 2009, 09:11 AM
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0.040" over is probably pushing it.
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Old Feb 23, 2009, 11:36 AM
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most people do .020 over
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Old Feb 23, 2009, 11:58 AM
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Mitsubishi recommends no more than a .040 overbore (86mm). I have head people say you can push things to .080 (87mm), but certain compromises come with that.
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Old Feb 23, 2009, 12:08 PM
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86mm should be the max you can overbore,I have over bored to .060 though,but thats pushin it!
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Old Feb 24, 2009, 06:16 AM
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86 is about it on anything with 800 or less.
If its a 400hp rebuild maybe 86.5
if your shooting for the 1k plus stick to 85 or switch to a 64 block.
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Old Jun 25, 2009, 12:53 PM
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Well, if anyone has does do a .060 over let me know. I am a cheap bastard and have 4G64 wisecos and don't want to spend money on new 4G63 pistons... My 64 block is pretty much shot and has been sitting too long. Since I got a 63 might as well make a stroker huh?
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Old Jun 26, 2009, 09:17 AM
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Originally Posted by johnhwfd
Anybody find out yet?....lol. Its only been4 years.
I may do the .060 due to a blown piston that damaged the block wall. Any input would help.
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Old Jun 26, 2009, 11:29 AM
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I agree with most others... 86mm will be the max for a well tuned daily with mild-high hp
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