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Author Topic: 460 bore  (Read 10816 times)
gator
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« on: March 13, 2010, 11:38:47 pm »

How much can you bore a 460 safely, street/strip?
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« Reply #1 on: March 13, 2010, 11:45:57 pm »

Hard to say. I heard of 68-70 blocks going .100 over  It's always best to sonic check to know what you can safely do. .030 over may be too much... you never can tell really.
Bill
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ANDY7YO
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« Reply #2 on: March 14, 2010, 09:23:11 am »

My last was .080 and half filled with hard block, mud raced it for 6 years.
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Andy
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« Reply #3 on: March 24, 2010, 06:38:19 pm »

As the other guy stated, it is not uncommon to be able to bore them .080 over.  That is one of the combinations used to make 514 and 533 inch engines.  Unfortunately you never know unless you have it checked.  It would suck to put all that time/money/energy and then find out afterward that you are too thin and the block cracks or leaks.  Do yourself a favor and check it first.  I had one 71 block that with the core shift it would only safetly go .040  and that was a block I was thinking about making a 514 from.
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Kevin Meine
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« Reply #4 on: March 25, 2010, 10:07:07 pm »

Ditto, sonic check them. The old yellow Performance Ford book of the 70's stated any 429/460 could go .080 over, and up to .160 with checking. There's always the odd bad block, so test it first. Regards,
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« Reply #5 on: September 27, 2012, 09:19:13 am »

How much can you bore a 460 safely, street/strip?
One small addition for analogous purposes: The 385 Series blocks are not like the earlier Ford designs such as the Winsor which are considered "done" at 0.060" over. Many 385 Series can be bored far beyond that. Currently we have one that can go 0.140" overbore without issue.

Exactly how much any given block can be bored is best evaluated with a sonic checker, but there have been sonic check parties where dozens of 385 Series blocks were evaluated and found to all be good to at least 0.060" and essentially to 0.080" based on my personal interpretation of all those sonic check sheets. That means 1000 hp at 0.080" no problem, and possibly more than that depending on engine combination, bore, stroke, rpm, rod ratio, power adder or not, etc.

Over in this camp, we have managed more than 1500 hp through 0.080" 2-bolt 385 Series blocks that were run bone dry, unfilled, and were not sonic checked. Further, we have managed about 3000 hp through similar 385 Series passenger car blocks (with as much as 96% nitromethane) which had zero modifications except for a 4-bolt main cap conversion and o-ringed deck...and again the block was run bone dry, unfilled, and was not sonic checked.

Paul
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We're On The Web; Click Below:
High Flow Dynamics
Performance Components for the 429/460 Engine Family
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« Reply #6 on: September 27, 2012, 07:46:48 pm »

Hi Paul.     Welcome     I follow you over on the 460ford forum.

Anybody following this thread listen closely as Paul knows his shit on the 385's!   4 Eyed

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« Reply #7 on: September 27, 2012, 08:59:13 pm »

How much can you bore a 460 safely, street/strip?
One small addition for analogous purposes: The 385 Series blocks are not like the earlier Ford designs such as the Winsor which are considered "done" at 0.060" over. Many 385 Series can be bored far beyond that. Currently we have one that can go 0.140" overbore without issue.


Paul



Hi, Paul.      Welcome



How do they come up with 632ci BBF engines?  I've always fancied that number!      Naughty
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« Reply #8 on: September 30, 2012, 11:14:16 am »


Hi, Paul.      Welcome

How do they come up with 632ci BBF engines?  I've always fancied that number!      Naughty
The 632 cubic inch engines cannot be built with the OEM passenger car blocks; they require an aftermarket block such as the Ford Racing A460 block, Eliminator Products block, C&C Motorsports block, etc.  Typically, the bore and stroke of a 632 is 4.60" bore x 4.75" stroke.

The blocks that would be used for the 632 are still standard deck height blocks (10.300"). There are also tall deck blocks, the next common block deck height being 11.200", then 11.700", then 12.000". (The OEM 385 Series has a 4.900" bore spacing, as do the 11.200" and 11.700" tall deck blocks; the 12.000" block has a 5.000" bore spacing.)

The largest displacement tall deck 385 Series I have seen is a Jon Kaase built 815 Hemi.

Paul
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We're On The Web; Click Below:
High Flow Dynamics
Performance Components for the 429/460 Engine Family
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