Harmonic Balancer
Race Director
Joined: Oct 2004
Posts: 12,795
Likes: 4,614
Well it's sort of complicated. ATI is one of the best HB at doing the job, but it only comes in 10% in our applications IIRC. ASP or other (don't go cheap) at 25% is an underdrive pulley, but NOT a HB. Some say it makes a difference in the longevity of the engine. But you def DON'T want the 25% if have a lot of draw on the alternator, like a big amplified stereo system. Alternatively ASP at least has a OVERDRIVE accessory pulley (forgot which one(s)), to offset some of that 25% (which is a lot relatively speaking).
Personally I would get an ATI which performs top of class, and just go with their 10% standard UD HB.
Personally I would get an ATI which performs top of class, and just go with their 10% standard UD HB.
Last edited by grinder11; Apr 3, 2021 at 01:12 PM.
Melting Slicks
Joined: Feb 2007
Posts: 3,297
Likes: 398
From: Raleigh Suburbs
As far as I know, the ASP IS a HB. I have seen one fail, and it definitely had some sort of rubber/elastic bonding ring between the inner and outer metal rings that failed, much like stock ones do. Any V8 would have to have some sort of control of the harmonics, or you'd be looking at some very short bearing/valvetrain life. As for the ASP offering a compensatory OD accessory pulley, you are correct. IIRC, it's for the alternator, due to the C5 being so fussy about voltage......
Advanced
Joined: Aug 2016
Posts: 52
Likes: 8
From: California
Looks like I'm joining the HB club!
I've been reading about HB's by chance, here on the boards and went to check mine - sure enough the sob is wobbly.
I started looking at aftermarket parts - like most of you suggested here - ATi. There's just one issue I ran into - I'm not sure which balancer to get, on ATi's web page there's so many different types and kinds - all I need is a replacement HB for a stock LS1 and the seal that goes with it.
Has anyone done the pin kit too? Is that a job I could do in my garage?
I've been reading about HB's by chance, here on the boards and went to check mine - sure enough the sob is wobbly.
I started looking at aftermarket parts - like most of you suggested here - ATi. There's just one issue I ran into - I'm not sure which balancer to get, on ATi's web page there's so many different types and kinds - all I need is a replacement HB for a stock LS1 and the seal that goes with it.
Has anyone done the pin kit too? Is that a job I could do in my garage?
.
Joined: Apr 2013
Posts: 5,010
Likes: 1,143
From: Oregon
St. Jude Donor '14-'15-'16-'17-'18-'19-'20-'21-'22-'23
Looks like I'm joining the HB club!
I've been reading about HB's by chance, here on the boards and went to check mine - sure enough the sob is wobbly.
I started looking at aftermarket parts - like most of you suggested here - ATi. There's just one issue I ran into - I'm not sure which balancer to get, on ATi's web page there's so many different types and kinds - all I need is a replacement HB for a stock LS1 and the seal that goes with it.
Has anyone done the pin kit too? Is that a job I could do in my garage?
I've been reading about HB's by chance, here on the boards and went to check mine - sure enough the sob is wobbly.
I started looking at aftermarket parts - like most of you suggested here - ATi. There's just one issue I ran into - I'm not sure which balancer to get, on ATi's web page there's so many different types and kinds - all I need is a replacement HB for a stock LS1 and the seal that goes with it.
Has anyone done the pin kit too? Is that a job I could do in my garage?
I'm sure Summit sells pin kits also an your local GM dealer should have the seal
Last edited by Smoken1; Apr 3, 2021 at 10:49 PM.
Team Owner
Joined: May 2001
Posts: 25,044
Likes: 1,265
From: Virginia
St. Jude Donor '11
The stock balancer's rubber fails at both mileage and time. Yours's is 18 so yeah, it could be failing. If you put on another OEM balancer it too will fail over time. I'm doing my 02's this Spring and I'm going with an ARP bolt and Summit C2501 balancer https://www.summitracing.com/parts/sum-c2501 You want to replace it before it completely fails and does damage to other parts.
...but i will be pushing up daisies in 10 years anyway so who cares ? I used a Powerbond...that was good enough for me and better than the GM crappy balancer...just sayin...
Advanced
Joined: Aug 2016
Posts: 52
Likes: 8
From: California
Does anyone have the ATI balancer part number / ARP stud / pinning kit? I'm about to get them but there's so many options on their page and I have no idea which combination is correct for a stock LS1.
EDIT:
I think I've found it:
EDIT:
I think I've found it:
- GM Corvette Y-Body Serpentine Dampers (Steel) / Part number: 917246 / $ ??? - there's no price?
- Damper Crank Bolts & Retaining Bolts / ARP - Includes sealant / Part number: 951503 / $47
- Crank Pin Drill Fixture Kits for HEMI & LS1 Engines / LS1, 2, 3, 6, 7 / Part number: 918993 / $124 - anyone know of any less excessively expensive pin kits?
Last edited by WhiteKnuckleRide; Apr 19, 2021 at 02:33 AM.
Team Owner
Joined: May 2001
Posts: 87,294
Likes: 1,579
From: Western NY
Does anyone have the ATI balancer part number / ARP stud / pinning kit? I'm about to get them but there's so many options on their page and I have no idea which combination is correct for a stock LS1.
EDIT:
I think I've found it:
EDIT:
I think I've found it:
- GM Corvette Y-Body Serpentine Dampers (Steel) / Part number: 917246
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
2027 Corvette vs The World: Every Model vs Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!
Michael S. Palmer