Which damper for a 327 / 275?

Paul Merolla · 12-16-2009, 11:42 AM

I'm making out my Christmas list, and have a question for you guys...ATI shows a 6.325" and a 7" balancer for the SBC. I've never understood why, but never really needed to know til now.

rod · 12-16-2009, 06:47 PM

bigger, larger dia. is better. if you have a Jessel belt system, you can use an 8" narrow width, not the wide 8".
rod

Alan Roehrich · 12-16-2009, 07:57 PM

Call ATI and let them tell you exactly what balancer you need. Their balancers are tuned, by any number of factors. They offer multiple diameters, various numbers and locations of o-rings, different materials for different weights, and even different durometer o-rings. All so you get the damper that works for what you are putting it on.

Aaron Keown · 12-18-2009, 11:31 AM

The smaller balancer will run faster on the car,larger one will make a smother engine and show more h.p. on the dyno but will not accelerate as quickly.You might also want to think about ATI's balancer that has the magnets already built into it for the crank trigger,if you already have a crank trigger just be aware that some machining will be required around the inside lip of the crank trigger wheel to make it seat properly,this did not used to be the case but they have changed the lip on the balancers within the last year.Its only an issue if you are using a crank trigger.

Paul Merolla · 12-19-2009, 09:33 AM

Thanks for the replies, guys. Aaron, I forgot to say this is for a stocker so no crank trigger.

Alan Roehrich · 12-19-2009, 09:36 AM

Paul, if it helps you decide, we have the smallest aluminum damper ATI makes on the 427 Stock engines we race. And we do not use those heavy flexplates either.

Bub Whitaker · 12-19-2009, 06:36 PM

ATI 917320 for that combo...

Paul Merolla · 12-20-2009, 08:45 AM

Quote:

Originally Posted by Bub Whitaker

ATI 917320 for that combo...

Thanks, Bub, for the reassurance. I was told by reliable sources to get the lightest one, and that was the # I came up with from ATI's website. BTW, anybody else that's shopping for one of these...Summit beat everyone else by $50.

Mark70Nova · 12-20-2009, 11:56 AM

I'm a WD for ATI dampers and would be glad to help out any of you guys. I'm with Alan, as I prefer to put the small light weight ones on our drag race engines.

Mark

12-16-2009, 11:42 AM	#1
Paul Merolla Senior Member Join Date: Dec 2001 Location: Papillion, NE Posts: 597 Likes: 206 Liked 232 Times in 57 Posts	Which damper for a 327 / 275? I'm making out my Christmas list, and have a question for you guys...ATI shows a 6.325" and a 7" balancer for the SBC. I've never understood why, but never really needed to know til now.

12-16-2009, 06:47 PM	#2
rod Member Join Date: Dec 2009 Location: Kingman, NW AZ. in the middle of the longest stretch of Route 66 Posts: 308 Likes: 0 Liked 17 Times in 13 Posts	Re: Which damper for a 327 / 275? bigger, larger dia. is better. if you have a Jessel belt system, you can use an 8" narrow width, not the wide 8". rod

12-16-2009, 07:57 PM	#3
Alan Roehrich VIP Member Join Date: May 2006 Location: Murfreesboro TN Posts: 4,948 Likes: 1,037 Liked 1,120 Times in 295 Posts	Re: Which damper for a 327 / 275? Call ATI and let them tell you exactly what balancer you need. Their balancers are tuned, by any number of factors. They offer multiple diameters, various numbers and locations of o-rings, different materials for different weights, and even different durometer o-rings. All so you get the damper that works for what you are putting it on. __________________ Alan Roehrich 212A G/S

12-18-2009, 11:31 AM	#4
Aaron Keown Junior Member Join Date: Mar 2004 Location: 1710 Dutch Lane,Jeffersonville,IN Posts: 63 Likes: 0 Liked 0 Times in 0 Posts	Re: Which damper for a 327 / 275? The smaller balancer will run faster on the car,larger one will make a smother engine and show more h.p. on the dyno but will not accelerate as quickly.You might also want to think about ATI's balancer that has the magnets already built into it for the crank trigger,if you already have a crank trigger just be aware that some machining will be required around the inside lip of the crank trigger wheel to make it seat properly,this did not used to be the case but they have changed the lip on the balancers within the last year.Its only an issue if you are using a crank trigger.

12-19-2009, 09:33 AM	#5
Paul Merolla Senior Member Join Date: Dec 2001 Location: Papillion, NE Posts: 597 Likes: 206 Liked 232 Times in 57 Posts	Re: Which damper for a 327 / 275? Thanks for the replies, guys. Aaron, I forgot to say this is for a stocker so no crank trigger.

12-19-2009, 09:36 AM	#6
Alan Roehrich VIP Member Join Date: May 2006 Location: Murfreesboro TN Posts: 4,948 Likes: 1,037 Liked 1,120 Times in 295 Posts	Re: Which damper for a 327 / 275? Paul, if it helps you decide, we have the smallest aluminum damper ATI makes on the 427 Stock engines we race. And we do not use those heavy flexplates either. __________________ Alan Roehrich 212A G/S

12-19-2009, 06:36 PM	#7
Bub Whitaker Member Join Date: Feb 2005 Location: Dayton, MD Posts: 222 Likes: 0 Liked 1 Time in 1 Post	Re: Which damper for a 327 / 275? ATI 917320 for that combo... __________________ Bub Whitaker

12-20-2009, 11:56 AM	#9
Mark70Nova Junior Member Join Date: Aug 2009 Location: So Cal Posts: 33 Likes: 85 Liked 0 Times in 0 Posts	Re: Which damper for a 327 / 275? I'm a WD for ATI dampers and would be glad to help out any of you guys. I'm with Alan, as I prefer to put the small light weight ones on our drag race engines. Mark