CRG Discussion Forum

Camaro Research Group Discussion => Restoration => Topic started by: VI009DZ on May 31, 2007, 12:43:26 PM

Title: 1969 Z/28 Exhaust manifolds
Post by: VI009DZ on May 31, 2007, 12:43:26 PM
I'm looking at picking up a set of manifolds with smog holes for my 1969 Z/28 (3946826 RH, 3942527 LH).  Dates on the manifolds aren't critical for me (10C '68 car), but I've seen sets on eBay being sold as GM licensed reproduction parts for around $300/set new. (link below)  Both manifolds have the same date.  I'm wondering if anybody has purchased these manifolds, and could tell me if they are really decent parts, or if they are cheap foreign junk.  As much as I love my headers, I'd like to begin piecing my engine bay back to stock dress.  Thank you all.....

-adam

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&Item=8050603702
Title: Re: 1969 Z/28 Exhaust manifolds
Post by: Gambitt on June 01, 2007, 02:32:50 AM
The repo manifolds were brought up in a discussion on here a while back.  I asked Jerry MacNeish what he thought about them and he said they are a pretty nice reproduction part.  I think I will be buying a set too.  Any nice originals go for $1000-1800, so repo's are the only way to go on this for us average joes.
Title: Re: 1969 Z/28 Exhaust manifolds
Post by: Jonesy on June 01, 2007, 04:41:20 AM
I bought a pair of repop big block exhaust manifolds from this seller. They fit real nice and have the real appearance of the originals. I have not bought or used the small block ones. The ones I bought we a perfect fit and the casting numbers looked just like factory on the car.
Title: Re: 1969 Z/28 Exhaust manifolds
Post by: Gambitt on June 01, 2007, 12:06:09 PM
Here is the thread I was referring to:

http://www.camaros.org/forum/index.php?topic=1612.0
Title: Re: 1969 Z/28 Exhaust manifolds
Post by: VI009DZ on June 01, 2007, 01:11:51 PM
Thanks for the info guys....I appreciate the opinions, and thank you for digging up that link fo rme Gambitt....

-adam
Title: Re: 1969 Z/28 Exhaust manifolds
Post by: Gambitt on June 01, 2007, 05:23:24 PM
No problem, and when you get those manifolds in, please post your opinion on them.  One more thing you might want to consider is sending them to Jerry MacNeish and have them reskinned...that way you would never have to worry about them rusting.   It would be nice to see a side-by-side comparison from someone that has a set of the orignals and a set of the repos.
Title: Re: 1969 Z/28 Exhaust manifolds
Post by: pickelnose on June 01, 2007, 11:37:57 PM
Are original 69Z manifolds with smog tube holes really worth that much.I have a set that I threw in the shed 17 years ago when I went to hedders.Im going to dig them up tommorow and put them in the house.
Title: Re: 1969 Z/28 Exhaust manifolds
Post by: Jerry@CHP on June 03, 2007, 01:43:34 PM
Nice original manifolds are big $$$.  Only if the date codes are good for 1969 production. 

When the repro manifolds came out, there were problems with fit and head bolt clearance but all of these issues have been fixed and they are very respectable now.  We've installed them on customer's cars and they look good.

Jerry
Title: Re: 1969 Z/28 Exhaust manifolds
Post by: Dave69x33 on June 16, 2007, 03:12:36 AM
My 69Z had headers on it when I purchased.  During the restoration, I look a long time for a set of originals but they all were pitted and looked bad,  relative to everything else that looked new after the restoration.

I purchased a set of GM Restoration Parts brand repros from Rick 1st Gen.  They fit and look great.  They need to be cleaned thoroughly several times with lacquer thinner then with soap and water and allowed to dry out for several days (or bake the moisture out of them at 200 degree for a period).  Then paint them with high temp paint, and baked according the manufacturers recommendations.

I used Seymourís "Pit Crew High Temp 1200 F "Cast Blast color, #16-2668.  Eastwood also sell a similar nice product called Factory Gray High Temp Coating #10395Z, $15.99 per 12 oz spray can.  I donít recall where I got the Seymourís product.

The pictures of my manifolds show the color which appears very natural.  My manifolds were painted back in 2000 and still look great...no rust!
Title: Re: 1969 Z/28 Exhaust manifolds
Post by: Dave69x33 on June 16, 2007, 03:15:11 AM
WOOOPS....too quick on the trigger....see attached.
Title: Re: 1969 Z/28 Exhaust manifolds
Post by: Gambitt on June 16, 2007, 04:34:51 AM
They do look nice.
Title: Re: 1969 Z/28 Exhaust manifolds
Post by: Jerry@CHP on June 18, 2007, 07:10:23 PM
The best paint for any exhaust manfolds is the VHT #SP998.  That is what we use for our reskinning process.  It's the best and will last the longest.  It's about $12 a can so it's cheaper too.

Jerry
Title: Re: 1969 Z/28 Exhaust manifolds
Post by: Gambitt on June 28, 2007, 10:07:37 PM
Do these repo exhaust manifolds have the holes for attaching the heat shields?
Title: Re: 1969 Z/28 Exhaust manifolds
Post by: x77-69z28 on June 29, 2007, 12:58:00 AM
i thought the heat shields attached to the block
Title: Re: 1969 Z/28 Exhaust manifolds
Post by: Gambitt on June 29, 2007, 01:30:06 AM
They might do it, I don't know for sure...I have seen several places selling rivets to put them on...but that doesn't mean they are advertising them correctly...if they do attach to the block, that would make things a lot easier.
Title: Re: 1969 Z/28 Exhaust manifolds
Post by: rich69rs on June 29, 2007, 04:42:44 AM
The heat stove on the passenger side exh manifold on cars with auto tran in '69 (obvioulsy non-Z28) is riveted to the exh. manifold which is different than the exh manifolds used on manual transmission cars.  The one in the attached PDF file (for auto tran) is fatter toward the rear to accomodate the heat stove.  It also has holes in it for the rivets to go into.  The spark plug heat shields bolt directly to the block.

See attached PDF file.
Title: Re: 1969 Z/28 Exhaust manifolds
Post by: Gambitt on June 30, 2007, 09:35:42 PM
So manual trans 69 Camaros do not use any rivets?  The shields bolt directly to the block?
Title: Re: 1969 Z/28 Exhaust manifolds
Post by: JohnZ on July 01, 2007, 01:08:15 AM
Don't confuse the riveted-on sheet metal heat stove that attaches to the exhaust manifold and feeds hot air through a tube to the air cleaner snorkel with the spark plug heat shields; the spark plug heat shields have been on every small-block Chevy V-8 since 1955, and they attach with 1/4"-20 bolts to tapped holes in the block.
Title: Re: 1969 Z/28 Exhaust manifolds
Post by: Gambitt on July 01, 2007, 02:57:59 AM
Cool, thanks JohnZ.  Since my car never had the original exhaust manifolds, I never knew how they attached...but I am getting ready to order a set of the repo original type. 
Title: Re: 1969 Z/28 Exhaust manifolds
Post by: Dave69x33 on July 06, 2007, 01:29:50 AM
As noted in this e-mail tread, the shields were bolted to the block as shown in the attached.  The other two pics are of original restored shields.  Itís interesting to note that the LH driverís side set, the bracket is separate from the shield and they are screwed together.  The passenger RH side shield and bracket is spot welded as one unit as shown.
Title: Re: 1969 Z/28 Exhaust manifolds
Post by: Gambitt on July 06, 2007, 11:52:00 AM
Thanks Dave...that's the exact pics I wanted to see.

Title: Re: 1969 Z/28 Exhaust manifolds
Post by: Gambitt on July 06, 2007, 02:20:23 PM
One more question Dave...french locks are still used, they are bent out and sit against the smog tubes?  I think that is what I see in your pics. 
Title: Re: 1969 Z/28 Exhaust manifolds
Post by: Gambitt on July 12, 2007, 11:45:02 AM
Well, I now have a set of the repo exhaust manifolds...and I have to say, these things are nice!  I will be shipping them to Jerry very soon to have them reskinned. 
Title: Re: 1969 Z/28 Exhaust manifolds
Post by: Dave69x33 on September 03, 2007, 02:54:53 AM
Hello Gambitt,

It been quite a while since I have been on the site, so sorry for the long delay in responding to your question.

I had to bend the loop portion of the French lock outward to clear the smog tube fittings.  It will not fit over the top side of the tube. 

I just now quickly looked thru my pic library for a pic of an unrestored 69 Camaro (manual shift car) that still had the exhaust manifolds and French looks but did not see one.  If I can find the pic, I'll post it.