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Old 03-25-2007, 09:33 AM
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bbc 402 maximum bore

hello does anyone know the max bore for a big block Chevy 402 block?right now i have a 402 block .030" over 4.155" that needs re-bore.I also have spare forged cranks 4.00" stroke ,spare forged standard size 4.250"pistons does anyone know if the 402 can have that much metal removed and not wanna stress crack and over heat? just wanna put parts i have laying around into something.

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Old 03-25-2007, 10:08 AM
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As most understand the 402 was actualy the 396 block that had been laying around at GM and was bored .030 and re-tooled and dubbed the 402 to fill in a gap between the 366 & 427-454 cui engines... Most any BBC will go .060-.100 so if its already at .030 then that makes it .060 at this point and should have no problem going .060 as a 402 is concerned... But as for going to a 4.250 bore that wont happen with those blocks...

Corrected... Sorry just tired and to lazy to proof read... Its cool...

Last edited by Bumpstick; 03-26-2007 at 04:44 PM.
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Old 03-25-2007, 10:17 AM
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thanks 4 the reply
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Old 03-25-2007, 02:59 PM
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Quote:
Originally Posted by Bumpstick
As most understand the 402 was actualy the 392 block that had been laying around at GM and was bored .030 and re-tooled and dubbed the 402 to fill in a gap between the 366 & 427-454 cui engines... Most any BBC will go .060-.100 so if its already at .030 then that makes it .060 at this point and should have no problem going .060 as a 402 is concerned... But as for going to a 4.250 bore that wont happen with those blocks...
Not to be an ***** but I'm pretty sure Chevrolet never produced a 392 or a 366 big block...... they did produce the acclaimed 396 big block though....maybe thats what you meant....
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Old 03-25-2007, 06:19 PM
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Pretty sure the 392 was a typo-----haven't we all done that?????

There was, in FACT, a BBC 366,-----truck motor

Bryan

Edit---maybe not a chevy---but GMC????----at any rate, they are out there.
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Old 03-25-2007, 07:38 PM
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there was a 366 tall deck,396,402,427,427 tall deck,454 mark 4 i am sure the 392 was a typo.(i knew what he meant)http://www.mortec.com/bbc.htm
i have had all of these except the 366 and think they're some of the best engines ever made.just wanted to put together something strong and "cheap".
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Old 03-26-2007, 11:42 AM
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Quote:
Originally Posted by project69ss
there was a 366 tall deck,396,402,427,427 tall deck,454 mark 4 i am sure the 392 was a typo.(i knew what he meant)http://www.mortec.com/bbc.htm
i have had all of these except the 366 and think they're some of the best engines ever made.just wanted to put together something strong and "cheap".
My apologys to those who I corrected about the 366, I actually wrote a paper over the history of the BBC in 10th grade, and out of all the literature I read over to write that paper the 366 BBC was never mentioned. *I thought I was right yet I stand corrected*

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Old 03-26-2007, 12:10 PM
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Quote:
Originally Posted by project69ss
hello does anyone know the max bore for a big block Chevy 402 block?right now i have a 402 block .030" over 4.155" that needs re-bore.I also have spare forged cranks 4.00" stroke ,spare forged standard size 4.250"pistons does anyone know if the 402 can have that much metal removed and not wanna stress crack and over heat? just wanna put parts i have laying around into something.

4.185 is .060 over on the 402 with the 4.125 stock bore, the 396 was 4.094 stock bore.
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Old 03-26-2007, 12:13 PM
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What are you going to do with it? Get you some block fill and go at it......run for short periods of time you should be OK or....KB has a 434 piston for the 396 bore using 4" stroke I been kinda wanting to do one but the duckies are slim here.

Last edited by BBCMudbogger; 03-26-2007 at 12:24 PM.
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Old 03-26-2007, 02:45 PM
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You can easily go 0.060 over on a 402 block. Makes a 413. At 0.090 over I would start to worry (418 cid).

If you have a 4 inch stroke crank (454), I would consider using that. Would make 440 cid with a 4.185 bore and 4 inch stroke. However, it would require an external balanced flywheel and crank harmonic balancer.

I run a 460 (454 +0.030) and a 413 (402 +0.060) in my truck (not at the same time). And the 454 has much better torque and even gets better mpg. Both engines are built to about the same specs (cam, compression, exhaust, carb, ignition, ect). I wish I had built the 402 with a 454 crank for a little more torque.
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Old 03-28-2007, 04:30 AM
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hey fellas,would any of you know the keith black part # for those +0.060"x4.00" bbc pistons?
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Old 03-28-2007, 10:20 AM
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Quote:
Originally Posted by project69ss
hey fellas,would any of you know the keith black part # for those +0.060"x4.00" bbc pistons?
That would be (KB 160 .060)
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Old 03-28-2007, 05:39 PM
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Thanks 4 info ...
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