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Old 09-24-2018, 04:28 PM   #1
2000wvdodge
 
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6.7 Block - Is a girdle a necessity?

I have been running a 5.9 for several years now over the 1200HP mark and have never had any main bearing trouble. I am starting to collect what I need to venture into the 6.7 world and know nothing about the characteristics of the blocks. Has anyone ran a pulling engine making over 1200HP without a girdle? If so, what kind of RPM and how many runs? My little 5.9 has been turned well over 6000rpms at the line and makes runs anywhere between 4700-5200 down the track depending on the track.

I searched through 3 pages of old posts looking for some info but only found posts talking about a build or stuff for sale.

Looking for some input... Not a bunch of "if your spending the money, why wouldn't you do the girdle too" comments.

Thanks!
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Old 09-24-2018, 05:41 PM   #2
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I would at that power level and rpm just for insurance
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Old 09-24-2018, 07:23 PM   #3
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I’d argue that cylinder wall integrity is more of a concern at 1200hp with a factory 6.7 block. There are also many examples of 1200hp engines living with a stock 6.7 girdle, albeit with bigger hardware. The extra displacement is definitely fun!
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Old 09-24-2018, 08:37 PM   #4
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Quote:
Originally Posted by Poulina View Post
The extra displacement is definitely fun!
Truth
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Old 09-24-2018, 10:19 PM   #5
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After making the switch from 5.9 to a 6.7. Screw the girdle buy sleeves instead. That much rotating mass at that rpm is bound to hurt those walls.
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Old 09-25-2018, 08:17 AM   #6
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I’m definitely going to sleeve this motor, but wasn’t sure if anyone has run a 6.7 block without a girdle. The industry makes one believe that the blocks are relatively weak unless they are deck-plated and girdled but is that really the case? I’ve learned over the years that not everything you see is as much a necessity as it is a sales pitch sometimes.
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Old 09-30-2018, 06:52 PM   #7
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I highly doubt it is necessary. I know fleece has stronger main cap dowels though, so they must have had issues with those.
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