LT1-LT4 Modifications 1993-97 Gen II Small Block V8

LT-1 Rod???

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Old Aug 12, 2007 | 01:59 PM
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Question LT-1 Rod???

What is the longest rod i can use with the stock crank... 5.7???6.0???
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Old Aug 12, 2007 | 02:14 PM
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Cranks need to have clearance at the counterweight when using SHORTER rods. Nothing stopping you from going longer, could go 6.125 if you want as I think that is the longest readily available for a 3.48 stroke and still find pistons. You are wrong if you think there is any worthwhile gain in going long as possible in a STREET motor though.
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Old Aug 12, 2007 | 02:15 PM
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stock is 5.7 rod,you would benefit by moving to a 6"rod/piston combo.
do you have a particular reason for changing?
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Old Aug 12, 2007 | 02:18 PM
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it's staying a street motor while i build the one comeing out of the car... i was looking at going with a 6.0 scat rod and some 30 pistons.. if the 30 over bore makes a 355 what would the 6.0 rod make it than....
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Old Aug 12, 2007 | 02:20 PM
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oh if thats the case i would do a mild rebuild since you are planning on a major build save the money!
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Old Aug 12, 2007 | 02:23 PM
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Originally Posted by BsGreenZ
it's staying a street motor while i build the one comeing out of the car... i was looking at going with a 6.0 scat rod and some 30 pistons.. if the 30 over bore makes a 355 what would the 6.0 rod make it than....

..a 355 with lighter pistons and a better rod/stroke ratio.
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Old Aug 12, 2007 | 02:24 PM
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Originally Posted by BsGreenZ
it's staying a street motor while i build the one comeing out of the car... i was looking at going with a 6.0 scat rod and some 30 pistons.. if the 30 over bore makes a 355 what would the 6.0 rod make it than....
The rod length wont change the engine size. The wrist pin goes up in the piston more to compensate. Longer rods just free up a little side load and make it easier for the piston to go up and down.
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Old Aug 12, 2007 | 02:28 PM
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ok so it will stay a 355 but i will be ok with using the 6.0 rods... this is a mild build motor i want to make the next one a 383 or bigger...
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Old Aug 12, 2007 | 02:30 PM
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You'll be fine. You can even reuse them in your 383 build if you want. Just change the crank and pistons. The longer rods make a lil more HP versus a shorter one.
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Old Aug 12, 2007 | 02:34 PM
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ok thanks guys... i was just wondering cause the rods are the same price for the 5.7 as for the 6.0...
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Old Aug 12, 2007 | 02:45 PM
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Make sure you get the right pistons or you'll have them sticking up above the deck. A 1.250” compression height piston will work with a 3.48" stroke and 6" rod.
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Old Aug 12, 2007 | 02:46 PM
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I think the supposed benifits of longer rods are GROSSLY overstated.

It will result in a little lighter piston which is easier on the rods and rodbolts but to claim it is worthwhile from a HP perspective on a street motor is an overstatement.

If buying parts anyway hell yeah go for the 6.0" but don't convince yourself that it was a big part of the project or results.

I also can not believe how many people thing rod length impacts displacement, I have run into that a lot and find it scary those folks are turning wrenches. Please make an effort to understand what you are doing.
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Old Aug 12, 2007 | 04:41 PM
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I dont like the longer rods it moves the pin to far up, the oil rings are right on top the pins theres no meat there for support the compression rings are also moved up higher. I seen the ring lands break since there so thin. more so on forced induction or nitrous injected cars but non the less theres less meat there.
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Old Aug 12, 2007 | 09:51 PM
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Have built a few 6.200 rod small blocks. Think all but one is still together and running donw the tracks or riding the waves.
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Old Aug 12, 2007 | 11:47 PM
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i talked to my engine builder today and and we decided to use the 5.7 rods... i dont really want to take any chances since i need this motor to last a year or two so i can build the hell out of the motor i'm pulling out.. thanks guys...
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Old Aug 13, 2007 | 11:53 AM
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Originally Posted by aboatguy
..a 355 with lighter pistons and a better rod/stroke ratio.
Yep!
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