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Old 08-02-2007, 09:44 PM   #1
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I recently inquired about the Big Boost and SRT Killer packages and the sales rep told me he wouldn't recommend running either setup with out a forged motor with built up internals. Anyone with experience with either setup. Just tossing the idea around and want to go slowly and find out all the bugs and catches before I drop all that money? What does it cost to build a forged motor? Thanks for the help in advance!

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Old 08-02-2007, 10:02 PM   #2
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A well know shop to this site told me that they have been rebuilding several bottom ends with just the standard GSM set-up was told the pistons were really weak. That's why I'm waiting on my installation.
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Old 08-02-2007, 10:29 PM   #3
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Quote:
quote:What does it cost to build a forged motor?
In the long run, it would be simpler to buy a 6.1 short block. Block is stronger, rods are better, and crank and pistons are forged. The bores are honed from the factory with torque plates. Open up the top ring gap a little, and your good to go.
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Old 08-02-2007, 10:38 PM   #4
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Quote:
quote:was told the pistons were really weak.
For sure they were not made for super/turbo charged applications, but they are a eutectic piston. Where the real problem is, is the top ring end gap. The cylinder pressures, and temperature are high enough to make the top ring expand till there is no gap. When that happens, something has to give. Its usually the piston, just above the ring lands. In some situations, it leads to rapid disassembly.
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Old 08-02-2007, 10:44 PM   #5
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Hey Jay I didn't think the pistons in the 6.1 were forged? and eutectic piston means cast with high tech alloys right? Since I'm not to familar with them This message has been edited. Last edited by: bigkumadog, document.write(''+ myTimeZone('Thu, 02 Aug 2007 19:57:27 GMT-0700', '02 August 2007 10:57 PM')+''); 02 August 2007 10:57 PM
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Old 08-02-2007, 10:56 PM   #6
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Yes the 6.1 are forged. The difference between eutectic, and hypereutectic is the percent of silicon content.
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Old 08-02-2007, 10:57 PM   #7
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Thanks
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Old 08-02-2007, 11:25 PM   #8
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Check this out http://www.moparsupercenter.com/6-1l...5159561ab.html
not a bad price.
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Old 08-03-2007, 06:09 AM   #9
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I'm glad you're onboard here Jay - "you one smart guy"
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Old 08-03-2007, 06:20 AM   #10
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The 6.1 pistons are burning up just as fast as the 5.7's. You'd be wasting your money with a 6.1 short block and keeping the stock pistons. There are so many srt8's with blown GSM engines due to burned up pistons that they have their own "club".

And plenty of 6.1 rods have snapped at 500rwhp. The only thing worth a crap out of the 6.1 short block IMO is the crank and block. Even if you got a good tune and the pistons survived, the rods would be a serious weak link.

Build a good engine 1st time around and you'll save yourself some money. A 6.1 short block is not the answer to a f/i engine.
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