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02-22-2021, 06:58 PM | #1 |
BlahBlahBlah
Join Date: Feb 2002
Location: Wa.
Posts: 19,909
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Media blasting exhaust manifolds?
Im getting a pile of stuff ready to take to the blasters in a few weeks. My guess is its a good idea to blast them before redoing them with some high temp coating of some sort (undecided as of right now). I just dont remember seeing anyone post up pics of before and after blast of exhaust manifolds.
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02-22-2021, 08:22 PM | #2 |
Registered User
Join Date: Apr 2017
Location: Boise, ID
Posts: 856
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Re: Media blasting exhaust manifolds?
Definitely worth doing. I have a set that I had blasted and am waiting to coat or sell
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1968 GMC C2500 Long Bed Fleetside |
02-22-2021, 08:41 PM | #3 |
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Join Date: Jul 2015
Location: Sedalia Mo.
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Re: Media blasting exhaust manifolds?
I have blasted a few sets of mani's and have always put masking tape over the machined surfaces. Blasting will make a differnce in how long the coating lasts, but it never really lasts as long as you want. I'm on the cheap and always used Rustoleum engine paint. It does better by following the instructions and using an oven to cure them, but it's still just paint on a hot engine component.
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He who is without oil shall throw the first rod. Compressions 8.7:1 1972 C10 1976 C10 (parts truck) 1985 K20 |
02-23-2021, 12:06 PM | #4 |
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Join Date: Jul 2019
Location: New Boston, NH
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Re: Media blasting exhaust manifolds?
I used glass media in my cabinet.
Before: After: Coated with Eastwood manifold paint:
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1968 C-20 CST Vermillion http://imageevent.com/happy_dan/dantoys/68c20 2019 Silverado 2012 Camaro ZL1 |
02-23-2021, 12:31 PM | #5 |
Senior Member
Join Date: Dec 2014
Location: Edmonton Alberta
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Re: Media blasting exhaust manifolds?
They look great blasted and painted.
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DAVE Edmonton, Alberta 1959 Apache 1967 K20 1968 C20 1970 C10 1972 GMC 2500 1981 C10 |
02-23-2021, 09:28 PM | #6 |
BlahBlahBlah
Join Date: Feb 2002
Location: Wa.
Posts: 19,909
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Re: Media blasting exhaust manifolds?
Taping off the flanges is a good tip ... thanks.
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02-24-2021, 09:24 PM | #7 |
Senior Member
Join Date: Jul 2001
Location: Wellington, Ks
Posts: 10,228
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Re: Media blasting exhaust manifolds?
I bead blasted my exhaust manifolds on my 71 4x4 during the restore. Bead blasted but did not smooth. Was several years ago, used POR 15 Exhaust Manifold Cast Paint. Has held up well over the years but it is not a daily driver. Think it would be fine but unsure about daily driver use. Maybe a ceramic coat like is used on today's aftermarket headers would be an option also.
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1971 Chevy 1/2T 4x4 LWB 350 V-8 Was sm465-now 350TH/np205 Tilt, Tach, Towhooks Original Truck AM/FM Wellington, Ks |
02-24-2021, 10:25 PM | #8 |
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Join Date: Sep 2016
Location: Ozark, MO
Posts: 566
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Re: Media blasting exhaust manifolds?
I bought a cheap set of new manifolds off of E bay. Wiped them down with wax and grease remover, sprayed them with VHT cast iron paint. I've driven it about 5000 miles since and they look as good as the day i put them on.
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02-25-2021, 09:54 PM | #9 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,943
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Re: Media blasting exhaust manifolds?
When I was working on the 68 step in my buddies shop he had a Mac beed blaster he ended up giving it to me. I have it now but it's not hooked up.
But any way I blasted them in it before I took the cabinet home. I then smoothed them some to look nice. I used the black jet hot on them and they looked good on the motor.
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
03-05-2021, 11:59 PM | #10 |
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Join Date: May 2013
Location: Post Falls, ID
Posts: 896
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Re: Media blasting exhaust manifolds?
I sand blast them then wash them with hot water and dish soap (you could also hot tank them) to remove any grease and oil.
After they're nice and clean, I "paint" them with Permatex anti-seize just before installation. Smokes like crazy when you start it up but leaves a nice graphite coating that's easy to touch up. just brush on a little more anti-seize. It's cheap & easy, it works great and lasts a long time. old Hotrodder trick
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03-06-2021, 02:16 AM | #11 |
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Re: Media blasting exhaust manifolds?
I have blasted mine and sprayed them with a galvanized spray and then a coat of graphite. Lasts a long time and is easy to touch up as well. I never heard of the anti seize before.
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03-06-2021, 03:29 AM | #12 |
Senior Member
Join Date: Mar 2015
Location: washington
Posts: 2,259
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Re: Media blasting exhaust manifolds?
I use POR high temperature paint.
amazon has it. Nice stock cast look. The NCRS Corvette guys like it. |
03-06-2021, 12:03 PM | #13 | |
The Older Generation
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,557
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Re: Media blasting exhaust manifolds?
Quote:
I used Copper gasket sealer in a spray can on my 327 manifolds. I read that in an old hot rod book too. The only problem is they are hard to bolt on after you spray them because it doesn't dry. Stayed on really good though, after it baked on, and they didn't rust. LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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03-06-2021, 08:58 PM | #14 |
Senior Member
Join Date: Jul 2000
Location: North Texas
Posts: 3,533
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Re: Media blasting exhaust manifolds?
I sand blasted mine many years ago, then hit them with some VHT high temp cast iron gray. Those things looked good for more than 5 years. Wouldn't last long on headers because the thin wall tubes get much hotter.
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Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
03-07-2021, 02:16 AM | #15 |
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Location: Northern Nevada
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Re: Media blasting exhaust manifolds?
Blasted & hot Cerakote.
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Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 |
03-07-2021, 10:16 AM | #16 |
Senior Member
Join Date: Jul 2000
Location: North Texas
Posts: 3,533
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Re: Media blasting exhaust manifolds?
Does that POR-15 require primer, or simply very clean metal? Sure would like to know which of the products last the longest. On headers, none of them seem to last very long.
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Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
03-07-2021, 01:01 PM | #17 |
Senior Member
Join Date: Mar 2015
Location: washington
Posts: 2,259
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Re: Media blasting exhaust manifolds?
No primer needed.
I have used the POR high heat and after 3 years looks like the day I applied it. Admittedly not a lot of miles on this motor, under 1000. Blast and install with a brush. Rick |
03-07-2021, 01:16 PM | #18 |
Mr. Cheyenne
Join Date: Jun 2020
Location: Kyle, Texas
Posts: 1,688
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Re: Media blasting exhaust manifolds?
I wished I had though of this before putting on the new ram horns on my engine. Now they are all rusty looking - boo.
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Richard '72 Chevy C10 Cheyenne *Super WHT/MED BRONZE/WHT SBC 350 | TH350 | LWB | AC | Buddy Seats Upgrades: Tilt | Front Sway Bar | Radio | Sliding Window | Bed Spare w/Lock Bed Rails | Full LEDs | Courtesy Lights | Tachometer | Glovebox Lock & Light | Head Light Relays | *Upgraded Fully Super Trim |
03-07-2021, 02:59 PM | #19 |
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Re: Media blasting exhaust manifolds?
Sub’d for future reference
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03-07-2021, 06:16 PM | #20 |
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Re: Media blasting exhaust manifolds?
subscribed
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