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Old 06-22-2017, 05:18 PM
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Default 1969 Z/28 Camaro "472" Intake Manifold Expansion Plug

I'm cross posting from the CRG site as I'm not getting traction on this question. The original, steel intake expansion plug from my 472 intake manifold was lost. I sent the intake to a well known restoration shop for re-skinning and was surprised to see the replacement plug they used was stamped with manufacturers' marks. The original, factory installed 1 1/4" plugs had no marks so what I now have is incorrect. I have been trying to source a correct replacement steel plug and have ordered them from eBay sellers as well as Heartbeat City. Contrary to item photos they all arrive with some form of manufacturers' stamping marks. I have even tried to grind out the stamp however the result is not suitable for a quality restoration. The original 302 from my Z/28 which is being rebuilt needed a set of replacement frost plugs which I was able to source from a Corvette restoration parts supplier with no manufacturers' stamping marks however I've been unable to locate a correct replacement intake expansion plug. Anyone have a confirmed source for unstamped, 1 1/4" steel intake expansion plugs?

472 Intake with an incorrect replacement steel expansion plug showing stamped manufacturers' marks highlighted (source: eBay)
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Old 06-22-2017, 05:55 PM
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Wish I could help. I ran into the same issue as you. There must be a few out there. However, if it is used, it will likely get dinged pretty good when removed. I suppose you could get one out using a 1 inch wooden dowel instead of steel or brass as the drift.
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Old 06-22-2017, 05:58 PM
Charley Lillard Charley Lillard is offline
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What resto shop installed the wrong one ?
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Old 06-22-2017, 06:18 PM
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What resto shop installed the wrong one ?
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Old 06-23-2017, 12:58 AM
enio45 enio45 is offline
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how about machining the part to take out the stamp??
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Old 06-23-2017, 11:49 PM
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how about machining the part to take out the stamp??
Eddie, machining a stamped plug to eliminate the stamp is a definite possibility if I can't source a nice, unstamped replacement plug. As we don't have a lathe in our shop it would be a job I'd have to outsource.
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Old 06-24-2017, 12:12 AM
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I got lucky some years ago and ordered them from McMaster Carr. Ordered 25 (smallest quantity to order) and half of them didn't come with the stamp. Sorry I told a few friends and they all got scooped up. That stamp in most of those freeze plugs is actually pretty deep. Some were almost 30 thousandths deep.
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Old 06-24-2017, 12:48 AM
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lloyd, send me a few and let me try at my machine shop
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Old 06-24-2017, 04:52 AM
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Quote:
Originally Posted by dvss1 View Post
I got lucky some years ago and ordered them from McMaster Carr. Ordered 25 (smallest quantity to order) and half of them didn't come with the stamp. Sorry I told a few friends and they all got scooped up. That stamp in most of those freeze plugs is actually pretty deep. Some were almost 30 thousandths deep.

"That stamp in most of those freeze plugs is actually pretty deep'" Yes, I've experienced that trying grind it off.
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Old 06-24-2017, 05:38 PM
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Is it possible to pour some filler, resin, glue etc. on the stampings and then restore the freeze plug? Try to fill the stampings in and then sand out?
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