1969 350hp Harmonic Balancer?
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1969 350hp Harmonic Balancer?
OK, I asked this in C3 General, didn't get much help. The more I read, the less I know about what harmonic balancer to get for a 1969 350 hp car. NCRS says:
300 hp= 6"
427/390, 400hp= 7"
350 hp, 427 solid lifter= 8"
Simple enough? Every online catalog I read had different/ conflicting/ inconsistent info. 350 hp is never listed with 427 engines. 69 is lumped in with other "performance" 350s and with smaller HB's. 65-69 8" balancers only show big blocks. Part numbers have been 12555879, 3870325 , 3860010, and ???
Anyone have a line on exactly what goes in the 350hp, and maybe even part numbers or, <gasp> a place to get one??? I'm hearing the right one is 8". Any part numbers? They aren't all the same, right?
300 hp= 6"
427/390, 400hp= 7"
350 hp, 427 solid lifter= 8"
Simple enough? Every online catalog I read had different/ conflicting/ inconsistent info. 350 hp is never listed with 427 engines. 69 is lumped in with other "performance" 350s and with smaller HB's. 65-69 8" balancers only show big blocks. Part numbers have been 12555879, 3870325 , 3860010, and ???
Anyone have a line on exactly what goes in the 350hp, and maybe even part numbers or, <gasp> a place to get one??? I'm hearing the right one is 8". Any part numbers? They aren't all the same, right?
Safety Car
Joined: Aug 2006
Posts: 4,102
Likes: 1
From: Forsyth Illinois
Steve...I am pretty sure that it ius a 8".I don't have my books here in the house,but get me a part number,and I have several dampers that I have pulled off vettes in the past.
The reason for the differences of size for the engines are....all the engines that you listed are internally balanced,true enough,but the bigger the damper....the better the dampening effect would be for a higher RPM engine like your L46,and the solid lifter 427.The 427/400 is a solid lifter engine too,so that is kinda weird that it has a 7".
I don't know,but wouldn't think that this is a Corvette only damper that you are needing.This shouldn't be too hard of a quest.I think the finned dampers for the 8" ended in 68,and those ARE hard to come by.....
The reason for the differences of size for the engines are....all the engines that you listed are internally balanced,true enough,but the bigger the damper....the better the dampening effect would be for a higher RPM engine like your L46,and the solid lifter 427.The 427/400 is a solid lifter engine too,so that is kinda weird that it has a 7".
I don't know,but wouldn't think that this is a Corvette only damper that you are needing.This shouldn't be too hard of a quest.I think the finned dampers for the 8" ended in 68,and those ARE hard to come by.....
Last edited by vettesbydesign; Jan 14, 2009 at 12:47 AM.
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
OK, I asked this in C3 General, didn't get much help. The more I read, the less I know about what harmonic balancer to get for a 1969 350 hp car. NCRS says:
300 hp= 6"
427/390, 400hp= 7"
350 hp, 427 solid lifter= 8"
Simple enough? Every online catalog I read had different/ conflicting/ inconsistent info. 350 hp is never listed with 427 engines. 69 is lumped in with other "performance" 350s and with smaller HB's. 65-69 8" balancers only show big blocks. Part numbers have been 12555879, 3870325 , 3860010, and ???
Anyone have a line on exactly what goes in the 350hp, and maybe even part numbers or, <gasp> a place to get one??? I'm hearing the right one is 8". Any part numbers? They aren't all the same, right?
300 hp= 6"
427/390, 400hp= 7"
350 hp, 427 solid lifter= 8"
Simple enough? Every online catalog I read had different/ conflicting/ inconsistent info. 350 hp is never listed with 427 engines. 69 is lumped in with other "performance" 350s and with smaller HB's. 65-69 8" balancers only show big blocks. Part numbers have been 12555879, 3870325 , 3860010, and ???
Anyone have a line on exactly what goes in the 350hp, and maybe even part numbers or, <gasp> a place to get one??? I'm hearing the right one is 8". Any part numbers? They aren't all the same, right?
And ... you should take a close look at what Timing Cover and Timing Tab you have ... if they're correct, you can determine which diameter fits that.
regardless of diameter, BBC damper will Not fit sbc nor vv.
If you have hipo (often codified "hp") 69 small block; my best guess is 8" ... but I do NOT KNOW what's correct for yours.
Safety Car
Joined: Aug 2006
Posts: 4,102
Likes: 1
From: Forsyth Illinois
Jackson...he has 69 350/350 horse car,or I should say....this is one of Steve's cars.
It would be the 8",but do you know the number?I have some vette 8" balancers here,and also,have a 70 010 engine w/8" balancer from a truck.????
It would be the 8",but do you know the number?I have some vette 8" balancers here,and also,have a 70 010 engine w/8" balancer from a truck.????
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From: About 1100 miles from where I call home.
First ... what cubic inch is YOUR motor? is it BBC or sbc?
And ... you should take a close look at what Timing Cover and Timing Tab you have ... if they're correct, you can determine which diameter fits that.
regardless of diameter, BBC damper will Not fit sbc nor vv.
If you have hipo (often codified "hp") 69 small block; my best guess is 8" ... but I do NOT KNOW what's correct for yours.
And ... you should take a close look at what Timing Cover and Timing Tab you have ... if they're correct, you can determine which diameter fits that.
regardless of diameter, BBC damper will Not fit sbc nor vv.
If you have hipo (often codified "hp") 69 small block; my best guess is 8" ... but I do NOT KNOW what's correct for yours.
It sure seems like 8" is the consensus. I guess my question now is... does it matter which 8" I use? I'm surmising that 8" is used for both some big blocks and hi-per 350 in '69. (per NCRS) But are they different 8" parts? Different part numbers? Again, does it matter?
(above posts says BB wont fit SB even if they are both 8"... I guess this answers the question? What's the difference??)
ZIP lists a 350 hp '69 for $79. Dr. Rebuild lists a 350 hp '69 for $275.
Last edited by vettebuyer6369; Jan 14, 2009 at 01:19 AM.
Drifting
Joined: Jul 2006
Posts: 1,259
Likes: 154
From: Deplorableville Nebraska
I had the same confused look on my face when I started to research which balancer I needed for my '70 350hp. I finally researched which brand was considered the best for the bucks, and called them. The brand was Pioneer, and the tech there was very helpful. The correct size is 8", and I was told the part #DA-3502 is the correct one. There is also a HD model listed, but that was for high HP. The replacement balancer is not quite as wide as my original, but functions as well. A quick lookup shows no difference between '69 and '70 L46 cars. I believe I bought it at Autozone, although I may be wrong. Good Luck....
Thread Starter
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From: About 1100 miles from where I call home.
Thanks Dave... I was discussing this with someone who was unhappy that he had a '69 one as opposed to the '70 he needed, so I was assuming there was a difference in those years. Im seeing these listed 66-69, 68-69 or 69-80, so I couldn't possibly guess what was right. I'm actually getting more fuzzy the more I read.
Thanks for the input everyone.
Thanks for the input everyone.
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Le Mans Master
Joined: Sep 2001
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From: Unreconstructed, South Carolina
I agree Pioneer makes a good damper. Whatever brand you get, ensure its matches YEAR of YOUR existing timing tab ... there are diffs among dampers re: timing mark index relation to keyway ... search my posts.
Thread Starter
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From: About 1100 miles from where I call home.
