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2 bolt to 4 bolt conversion NEED ALL EXPERTS HERE

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2 bolt to 4 bolt conversion NEED ALL EXPERTS HERE

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Old 04-20-2007, 06:14 AM
  #1  
w8less
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Default 2 bolt to 4 bolt conversion NEED ALL EXPERTS HERE

some friends and I were talking at work about how we thought this is possible. Converting a 2 bolt to a 4 bolt block. All i have ever heard is that it weakens the block. Is this true or merely fiction? IF it is true how so?If you think about it wouldn't in a sense gain strength from the 4 bolt mains or would it still have the same weakness that we all know the stock block has?

Also another point that was brought up was filling the block some. Doesn't this Strengthen the block also? Would/Could this be an alternative to get some added strength for just a weekend warrior? is there any real downsides besides the extra weight?

Please help solve some curiousty and to think this all got started from a friend with a chevy 2 bolt. He is worried about cracking his block with his 383 with solid roller cam and a supercharger coming up
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Old 04-20-2007, 07:34 AM
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nasty50
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Default RE: 2 bolt to 4 bolt conversion NEED ALL EXPERTS HERE

you technically can make your stock 302 a four bolt, but to my knowledge it won't do any good. the webbing is what goes on a stock block. just get a main girdle if your worried
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Old 04-20-2007, 07:47 AM
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Default RE: 2 bolt to 4 bolt conversion NEED ALL EXPERTS HERE

why wont it do any good? and how would a girdle be better than that of a 4bolt conversion
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Old 04-20-2007, 07:50 AM
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redmustang83596
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Default RE: 2 bolt to 4 bolt conversion NEED ALL EXPERTS HERE

Most of the time the block will fail along the lifter valley, so you would be wasting your time and money. It would probably be stronger to get a main support girdle then to convert to a 4 bolt main, but then again, thats not where most block failures are.
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Old 04-20-2007, 10:07 AM
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ACE
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Default RE: 2 bolt to 4 bolt conversion NEED ALL EXPERTS HERE

The only thing a Main girdle is good for if your making lots of horsepower its to keep your parts from flying around and hitting your oilpan.
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Old 04-20-2007, 10:12 AM
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Default RE: 2 bolt to 4 bolt conversion NEED ALL EXPERTS HERE

converting a thin web block to 4 bolt mains will actually weaken the motors bottom end and will allow it to fail easier
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Old 04-20-2007, 12:08 PM
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Gary H
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Default RE: 2 bolt to 4 bolt conversion NEED ALL EXPERTS HERE

There's not enough metal in the web area to convert to 4-bolt mains anyway. SBC might be different, but there are enough 4-bolt 350 blocks around that it's probably cheaper to buy one then have one converted.
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Old 04-20-2007, 05:16 PM
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Default RE: 2 bolt to 4 bolt conversion NEED ALL EXPERTS HERE

does filling the block help any? does anyone have personal experience with the girdles or is your info all e-say?
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Old 04-21-2007, 01:05 AM
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Default RE: 2 bolt to 4 bolt conversion NEED ALL EXPERTS HERE

filling the block??
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Old 04-21-2007, 01:08 AM
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Default RE: 2 bolt to 4 bolt conversion NEED ALL EXPERTS HERE

just dont do it
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