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Old 07-23-2007, 10:17   #1 (permalink)
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Aussie blocks- overbore

How much overbore will these blocks handle before splitting .
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Old 07-23-2007, 14:38   #2 (permalink)
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Re: Aussie blocks- overbore

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How much overbore will these blocks handle before splitting .
30 thou seems the safe max, but in rare occasions, you can have trouble at 30 as well.
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Old 07-25-2007, 14:26   #3 (permalink)
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Re: Aussie blocks- overbore

Yeah, playing the odds, I'd be happy with 30thou over. Personally, I wouldn't go over that.....I'd just source another block. All 5 of mine have been 30 over

How much power you planning on having?
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Old 07-25-2007, 17:19   #4 (permalink)
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Re: Aussie blocks- overbore

Old combo i had laying around 3.60 stroke 5.7 chevy rods 12.5 cleveland pistons 740 lift roller . Never had it on dyno . Ran 10.40s 130 4 years ago in 2800 pound mustang only change useing a set of gapp and roush high port heads. Going in 65 falcon im building.
would like bigger bore for these old prostock heads to breath. thouht about furnace brazing a block with big sleves old school .
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Old 07-26-2007, 12:30   #5 (permalink)
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Re: Aussie blocks- overbore

I was hoping aussie block would take a bigger bore. close to 600.00 to buy one .Save my money get a aftermarket block.
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Old 07-26-2007, 18:10   #6 (permalink)
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Re: Aussie blocks- overbore

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Originally Posted by slusher
I was hoping aussie block would take a bigger bore. close to 600.00 to buy one .Save my money get a aftermarket block.
Yeah, that's way too much for an old block.

I think the aftermarket block is a good decision, especially with the power you are after.
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Old 07-30-2007, 06:35   #7 (permalink)
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Re: Aussie blocks- overbore

only the 82/84 F350 block (siamese cylinder bores, often refered to as the nascar block) will take a decent over bore. tru blu is right, .030" is about it for stock block and performance use. save money in the long run and go aftermarket. cheers
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