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Old 03-22-2010, 01:37 PM
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bbc 402 max bore and stroke

I have a bbc 402 casting 3999290 year 71 to 72 it has been bored 1.25 over to a standard 4.250 427 and now I am wondering what's is the biggest stroke it can take or better left with the stock 3.76 crank not a daily driver just a weekend racer any ideas and thanks

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Old 03-22-2010, 04:34 PM
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Since it's not a street driver, have you put any hard block in the water jackets? Have you sonic tested the cylinder wall thickness? Just curious.

As far as stroke, I have never owned a 3999290 block, but I would think that you would be able to stroke it just like any other BBC short deck (9.800") block. 4.250" X 4.500" would make a 510 if you could find pistons with the right compression height.

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Old 03-22-2010, 06:28 PM
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Quote:
Originally Posted by dre1984
I have a bbc 402 casting 3999290 year 71 to 72 it has been bored 1.25 over to a standard 4.250 427 and now I am wondering what's is the biggest stroke it can take or better left with the stock 3.76 crank not a daily driver just a weekend racer any ideas and thanks
Unless it's a 4-bolt, I wouldn't take the stroke (in a racing engine) beyond 4" unless you put caps on it. YMMV.
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Old 03-23-2010, 02:16 AM
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Quote:
Originally Posted by cobalt327
Unless it's a 4-bolt, I wouldn't take the stroke (in a racing engine) beyond 4" unless you put caps on it. YMMV.
Sounds reasonable to me.
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