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post #1 of 7 (permalink) Old 07-23-07, 11:17 AM Thread Starter
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Aussie blocks- overbore

How much overbore will these blocks handle before splitting .

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post #2 of 7 (permalink) Old 07-23-07, 03:38 PM
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Re: Aussie blocks- overbore

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Originally Posted by slusher
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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post #3 of 7 (permalink) Old 07-25-07, 03:26 PM
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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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post #4 of 7 (permalink) Old 07-25-07, 06:19 PM Thread Starter
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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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post #5 of 7 (permalink) Old 07-26-07, 01:30 PM Thread Starter
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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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post #6 of 7 (permalink) Old 07-26-07, 07:10 PM
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Re: Aussie blocks- overbore

Quote:
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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post #7 of 7 (permalink) Old 07-30-07, 07:35 AM
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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

Craig Johnston.
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email- cjperformance@lizzy.com.au
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