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Old 03-31-2018, 09:10 PM   #15
6spdhyperblue


 
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Quote:
Originally Posted by bhillakaiceberg View Post
We good to go now! Good looking man!!
You turn down the stock bolt?
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Old 03-31-2018, 09:11 PM   #16
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Great !

Glad I could help
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Old 04-02-2018, 07:41 AM   #17
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Originally Posted by ULTRAZLS1 View Post
Will not allow damper to seat all the way on properly. Just installed one today. I had correct part # as well. 234-2504 for gen V LT1.

Just a heads up to anyone in the future. I just used a stocker with the end shaved down a bit. It won’t fit through the opening in the hub as is. Needs to be grinded just a little.
Thank you!! My UDP is sitting on the floor next 2 both bolts!! Awesome looking out!!
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Old 04-09-2018, 01:31 AM   #18
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Originally Posted by ULTRAZLS1 View Post
The arp is 5 1/8 long not including bolt head or washer. So it goes about 5 inches deep with the washer
That's what she said
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Old 04-09-2018, 11:40 AM   #19
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Old 10-23-2018, 12:51 PM   #20
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Quote:
Originally Posted by ULTRAZLS1 View Post
Will not allow damper to seat all the way on properly. Just installed one today. I had correct part # as well. 234-2504 for gen V LT1.

Just a heads up to anyone in the future. I just used a stocker with the end shaved down a bit. It won’t fit through the opening in the hub as is. Needs to be grinded just a little.

ATI has the application listed inncorrectly and therfore the info from the resellers is inncorrect as well.

Part # 234-2504 is 5.25" under the head and works with LS7 and LT4 Dry Sump. (Corvette & Z28)

Part# 234-2503 is 4.34" and appprox 4.00" under the washer and works with most LS and LT4 Wet Sump. (GM LS bolt measures 4.00" under the head, built in washer)

Last edited by Stefano; 10-23-2018 at 04:01 PM.
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Old 10-27-2018, 09:27 AM   #21
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Quote:
Originally Posted by Stefano View Post
ATI has the application listed inncorrectly and therfore the info from the resellers is inncorrect as well.

Part # 234-2504 is 5.25" under the head and works with LS7 and LT4 Dry Sump. (Corvette & Z28)

Part# 234-2503 is 4.34" and appprox 4.00" under the washer and works with most LS and LT4 Wet Sump. (GM LS bolt measures 4.00" under the head, built in washer)
Thanks for letting us know about this
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Old 10-27-2018, 11:11 AM   #22
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Originally Posted by ULTRAZLS1 View Post
I been working on cars for years and seen it all. Getting wrong or incorrect or just plain faulty parts happens all the time.

I once got a cam from comp that the holes were tapped so far off in the base of the cam it nearly came through the base circle. It was fingernail thin or less. Would have failed and ruined my engine for sure. Fuel pumps that simply won’t run. Wheel bearings that go bad in two weeks. Nothing is sacred
Chinese wheel bearings, last one year. I us only US, German or Japanese made bearings. Anything else you will be changing them in a year
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Old 06-27-2022, 09:08 PM   #23
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My bolt supplied with the ATI damper was the longer one and caused a harmonic balancer failure, ATI still incorrectly says to use the longer bolt.
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Old 06-27-2022, 10:45 PM   #24
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i bought a shorter bolt bc of this thread. few thousand miles, so far so good.
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Old 09-26-2023, 08:28 PM   #25
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I got the correct bolt thanks to this thread. Just for future searches, here is the stock crank bolt beside the 234-2503 ARP bolt.

Part# 234-2503 is what you want for SS/ZL1.
In my case, I went with the ZL1 style balancer for my SS - didn't want to deal with the weird size belt and don't really care if I'm missing out on 3-5hp.

You can also see the ARP bolt/washer fit the ATI hub perfectly, compared to the stock bolt which needs to be ground slightly.
FYI - the ATI balancer comes with the correct stock bolt.
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