AntiVTEC

I was wondering how can you tell if they are aluminum or iron? Also, how do you go about taking them off the car? I want to go to the junk yard and rip some off and slap them on my car! also, any notable preformance gains? thanks!

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85 2.8L Sport Coupe 5-speed.
Mods: Hpertech chip and powerstat, MSD 6A-L, Crane fireball coil, Dynomax hi-flow cat and catback system with a dynomax magnum race bullet muffler on the i-pipe, K&N filterchargers, Eibach and Tokiko springs/shocks setup, Global west sub frames, Suspension techniqs front and rear sway bars, and good ole 88 IROC wheels with Kumo Ecstas on em!
"I'm out to seek those pesky VTEC boys!" (don't get me wrong, I'm asian myself! hehe)

Jza

Aluminim will be grey colored, and cast iron will be black/dark colored or reddish (rust). And they just pull off once the wheels are off, but more often than not, they're stuck on due to rusty hubs or seized shoes, so take a mallet with you and use it to bang around the hub and studs while pulling on the drum.

There's a theoretical performance gain, but it's not "noticable". I also hear they warp easily or quicker than cast irons, but I've had mine for I don't know how long without problems.

AntiVTEC

Any other way to find out whether they are aluminum or not? such as year/engine/tranny combos? just in case some fool painted the iron drums grey too! hehe... payce

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85 2.8L Sport Coupe 5-speed.
Mods: Hpertech chip and powerstat, MSD 6A-L, Crane fireball coil, Dynomax hi-flow cat and catback system with a dynomax magnum race bullet muffler on the i-pipe, K&N filterchargers, Eibach and Tokiko springs/shocks setup, Global west sub frames, Suspension techniqs front and rear sway bars, and good ole 88 IROC wheels with Kumo Ecstas on em!
"I'm out to seek those pesky VTEC boys!" (don't get me wrong, I'm asian myself! hehe)

Wins: 2000 V6 Accord, 69 302 Mustang, 2000 Auto VR6 Jetta, 89 Toyota MR2, 90 Civic Si, 76 350 Camaro.

Jza

Scratch it with a key, screwdriver or something that's harder than aluminum. If it's shiny underneath, it's aluminum.

Pick it up. If it's light it's aluminum.

CrazyRob75

This one is too easy. Take a magnet. If it sticks, it's cast iron. If it doesn't, it's aluminum.
I'd also like to kknow the most common models they're found on. Will g-body drums work? Has anybody actually weighed them and found out the difference per drum?

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85 Berlinetta Iroc exterior NOW 454 powered, 4.10 gears, 275/60/15 Hoosier Quicktimes and a PILE of other goodies..........YES, it's street driven!

check it out at http://www.bsronline.net/members/rob/rob_specs.html

AntiVTEC

I've heard they're about 5 pounds lighter. Thats pretty good. Also, they've got a little more width than cast irons ones to give your rear end a little meaner stance. I think GM drums are universal throughout their entire line up. So any GM drum will fit any GM car/truck.

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85 2.8L Sport Coupe 5-speed.
Mods: Hpertech chip and powerstat, MSD 6A-L, Crane fireball coil, Dynomax hi-flow cat and catback system with a dynomax magnum race bullet muffler on the i-pipe, K&N filterchargers, Eibach and Tokiko springs/shocks setup, Global west sub frames, Suspension techniqs front and rear sway bars, and good ole 88 IROC wheels with Kumo Ecstas on em!
"I'm out to seek those pesky VTEC boys!" (don't get me wrong, I'm asian myself! hehe)

Wins: 2000 V6 Accord, 69 302 Mustang, 2000 Auto VR6 Jetta, 89 Toyota MR2, 90 Civic Si, 76 350 Camaro.

T.L.

It is only too obvious if they are aluminum...I have aluminum drums on my car...they came from a '84 H.O. Z-28...have not weighed them yet...

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'83 Trans Am clone;
700R-4, 3.42:1 rearend,
'84 Z-28 suspension, H.O. dual snorkel air cleaner, H.O. exhaust manifolds & system, 180* 'stat, stock ECM. Awaiting 350 swap with CompCams 212/218 --.444/.444 -- 110* LSA

Jza

Well, not the C/K platform trucks. Their bolt pattern is about a 1/4 inch wider than the F or G platform cars. I don't know about the W/T platform trucks, but I would assume they're even heavier built than the C/Ks.