Harmonic Balander--------HELP!
Thread Starter
Cruising
Joined: Jul 2005
Posts: 10
Likes: 0
Harmonic Balander--------HELP!
Help, everybody----------
I'm installing my new deep-breathing LT4 383 stroker in my 1994 Corvette. The engine came with an "AT Superdamper" harmonic balancer which was intended for an F-body installation. In the Corvette, the pulley does not line up with the accessories, being about 1 inch too far to the rear. We also noticed the diameter of the "AT Superdamper" was slightly larger than the original LT1 balancer.
Is it OK to go with the original LT1's harmonic balancer? Are there performance limitations to the original balancer which would make me want to replace it? The redline on the new all-forged reciprocating assembly is 7,000 rpm; is the original balancer all wrong for that application? Should I go with an underdrive pulley right now, for a few extra horsepower?
Thanks so much in advance!
Stealth C4
I'm installing my new deep-breathing LT4 383 stroker in my 1994 Corvette. The engine came with an "AT Superdamper" harmonic balancer which was intended for an F-body installation. In the Corvette, the pulley does not line up with the accessories, being about 1 inch too far to the rear. We also noticed the diameter of the "AT Superdamper" was slightly larger than the original LT1 balancer.
Is it OK to go with the original LT1's harmonic balancer? Are there performance limitations to the original balancer which would make me want to replace it? The redline on the new all-forged reciprocating assembly is 7,000 rpm; is the original balancer all wrong for that application? Should I go with an underdrive pulley right now, for a few extra horsepower?
Thanks so much in advance!
Stealth C4
Advanced
Joined: Nov 2006
Posts: 66
Likes: 0
From: Kempner TX
I just built a 388 LT1 a few weeks ago. I went with the ATI SuperDamper, last three part numbers 274 (first three are 219 or 291) designed specifically for the Vette. Got it at Summit.
Everything lined up on my 96, but I did need a longer serpentine belt.
I definitely wouldn't run the stock setup at 7000; I wouldn't even trust it at 6.
Gotta bite the bullet.
Jake
Everything lined up on my 96, but I did need a longer serpentine belt.
I definitely wouldn't run the stock setup at 7000; I wouldn't even trust it at 6.
Gotta bite the bullet.
Jake
Heel & Toe
Joined: Aug 2007
Posts: 16
Likes: 2
From: Maryland USA
You can just call ATI and ask them for the Y-body hub. Pull off your F-body short hub and install the y-body longer hub. The hub will cost about $150 shipped.
If it were my car I would keep the ATI damper. The stock is ok but the ATI is quite a bit better.
Karl Ellwein
95 impala SS with stock bottom LT1-350/ported heads/GM846cam/
4L60E/3600stall/4.10 rear/4000lb race weight/
11.98@115mph best ET all natural
95 impala SS clone with 383LT1/Chapman TFS heads/Crane solid roller cam/
TH400/ATI Treemaster/4.10 rear/3600lb race weight/
10.73@127mph best ET all natural
If it were my car I would keep the ATI damper. The stock is ok but the ATI is quite a bit better.
Karl Ellwein
95 impala SS with stock bottom LT1-350/ported heads/GM846cam/
4L60E/3600stall/4.10 rear/4000lb race weight/
11.98@115mph best ET all natural
95 impala SS clone with 383LT1/Chapman TFS heads/Crane solid roller cam/
TH400/ATI Treemaster/4.10 rear/3600lb race weight/
10.73@127mph best ET all natural
Last edited by Karl Ellwein; Aug 9, 2007 at 07:14 PM.
Burning Brakes
Joined: Jan 2002
Posts: 1,228
Likes: 1
From: Dallas Texas
Where do you measure, and what is the correct measurement supposed to be to indicate a properly installed hub and balancer assembly?
I too have an ATI Super Damper on my new engine and I am suspicious the hub is not pressed on completely. It was a completely nightmare getting the balancer on the hub in the car, so that seems to indicate the hub is sticking out too far...
I too have an ATI Super Damper on my new engine and I am suspicious the hub is not pressed on completely. It was a completely nightmare getting the balancer on the hub in the car, so that seems to indicate the hub is sticking out too far...
