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#1
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source for unfinned drums(??)
I was wondering if I could buy OE un-finned drums for my 1970 Firebird - I was a dummy in the late 1990's, and tossed my originals without a second thought...
This was essentially the message I sent to a company today which advertized in 'Smoke Signals' as relining drums; Their website stated they stocked many relined drums. To my surprise, I recieved a prompt reply (I didn't expect a reply on Sunday!); The gentleman replying seemed to have missed an important part of my query, because this was his reply: Quote:
So my question which I am now putting out to the knowledgable people here is; Does anyone know if/where I can get original style unfinned cast iron drums for my Firebird?
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1970 Formula 400 Carousel Red paint on Black standard interior A no-engine, no-transmission, no-wheel option car. Quite likely one of few '70 Muncie three speed Formula 400's left. 1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing) 2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs) |
#2
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Aluminum drums were used on 89-91 Camaro Z-28's as far as I know, Also had them on my '90 Formula Firebird .I have owned a few. These can be re -lined as the lining is steel bands.
Back to 1970 > I may have a extra set of 1970 dated drums. I will have to look. |
#3
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My understanding the smooth drums as I thought was the correct term?
I have them on my 72 Formula. I'm pretty sure they are correct from 70-72? Anyways that would include all f bodies built in 70-72 which would be a lot. My guess the demand is limited? Dated? I assume cast in the drum?
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Mike/Illinois |
#4
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My 1973 Formula 455 has them. I had them turned to eliminate the surface rust and minor pits. Only one shop was able to perform that service.
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1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey 1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles 2017 Sierra SLT 1500 Z71 4X4 2019 Canyon SLT Crew 4X4 |
#5
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Using casting number 3841177, a few usable cores pop up on Ebay...
The actual GM part number was 3841176.
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1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey 1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles 2017 Sierra SLT 1500 Z71 4X4 2019 Canyon SLT Crew 4X4 Last edited by 77 Canamman; 09-23-2019 at 07:43 AM. |
#6
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Jonny, Here is the rear drum from my '71 Formula that is original and I see a stamped number 3995560 in the outer portion. I'm not sure these changed from 70 to 71, but maybe it might help...
Dennis |
#7
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I have some,
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#8
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and
another available pair
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#9
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thanks to everyone for your input!
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1970 Formula 400 Carousel Red paint on Black standard interior A no-engine, no-transmission, no-wheel option car. Quite likely one of few '70 Muncie three speed Formula 400's left. 1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing) 2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs) |
#10
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Are they the same ones used on your 12 bolt as the 10 bolt?
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#11
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yup
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1970 Formula 400 Carousel Red paint on Black standard interior A no-engine, no-transmission, no-wheel option car. Quite likely one of few '70 Muncie three speed Formula 400's left. 1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing) 2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs) |
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