C3 Vette Registry - The Best Resource on the Net for C3 Vettes! C3 Vette
Forums -> C3 Fuel, Emission Control, and Exhaust Systems
Not Logged In! Login or Register!  Users Online: 20 / Help 
Features  Find C3 Parts on ebay in only 2 or 3 clicks!  | Add YOUR C3 to the Registry

Supporting Vendors
Bair's Corvettes
Volunteer Vette Products
VetteBookStore.com
Mid America Motorworks
CorvetteClothing.com

C3 of the Month
None Current
Enter Yours Today!
Online C3 Show
13
C3s are Registered

Vanity Plates
1981 CPE
Burkey
Featured Links

Buy Now
Corvette Magazine - $19.99 for 8 issues
Corvette Magazine
Only $19.99 for 8 issues


Corvette by the Numbers
Corvette by the Numbers


The Corvette Dynasty (Hardcover)
The Corvette Dynasty (Hardcover)


Corvette: America's Sports Car Yesterday, Today, Tomorrow (Hardcover)
Corvette: America's Sports Car Yesterday, Today, Tomorrow (Hardcover)



| Hide Signatures and Profile Pics

 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1]  
10/18/13 4:32pm - Original Message: 'Mystery to Solve'
dbarnesid
Former Member
- Send Private Message


Boise, ID - USA

Vette(s):
1972 mille miglia red corvette convertible. This is a car currently under restoration. The pic above is of me and my Ph.D. candidate daughter. She, not my Vette, is my pride and joy. Smile...

Joined: 5/29/2013
Posts: 159
I've got a mystery for you all to help me solve.
 
In the midst of restoration I removed the exhaust manifolds from my 1972 (with a turbo hydramatic 400 and AC). (Though the AC is not functioning and the compressor has been removed.)
 
I had the manifolds ceramic coated because my attempt to do a Por-15 job didn't work very well. There were several places where the Por-15 manifold paint flaked off. Probably because the manifolds were horribly corroded and oxidized so the paint just never would bond to the manifolds. After days of wire brushing and washing dust out of my sinuses I took them in to be sand blasted. While at the shop I decided to save myself some grief this time and spend some money and have them ceramic coated. They look great.
 
However, I decided to take a closer look at the casting numbers. 3747038. That number is off of a 1965 Corvette as near as I can tell. Also, they are both coded RH... right hand.
 
Now I'm puzzled. Why would one remove the manifolds from a 72 and replace them with those of a 65? And why two right hand manifolds? Is there any performance gain? Is it pure laziness? Is it a mistake? The engine is original because the engine vin matches the vin on the window post. So I don't have a 1965 engine.
 
But... why... dang... I'm scratching my head over this one. Confused


|UPDATED|10/18/2013 2:32:33 PM (AZT)|/UPDATED|


____________________________________
 Reply Reply  Quote Reply w/Quote
 
Support C3VR!
Suport our advertisers
10/18/13 9:28pm - Reply: 'Re: Mystery to Solve'
Adams' Apple Lifetime Member
Lifetime Member
Moderator
- Send Private Message


Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19454
Well...let's see if we can shed a little light on the subject....Big smile
First, the "RH" does NOT necessarily mean Right Hand. BOTH manifolds have RH on them on MOST exhaust manifolds. In our case, the "Ram's Horn" design manifolds WILL fit either side, since the outlet is centered on the manifold. There were some manifolds that did have extra castings on them for A/C, alternator, and other accessory attachments....those will NOT interchange side/side. Those will also have different casting numbers.  Thumbs Up

The 3747038 cast number listed fit MANY Chevrolet engines & vehicles of the era, including Bel Airs/Impallas up to at least '68...also including Corvettes.  
Is it correct for the '72? Idano...I could check, but unless you are having it Judged, I wouldn't worry too much about them. If they fit, and function, go with it! Big smile


____________________________________
Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
 Reply Reply  Quote Reply w/Quote
10/18/13 11:39pm - Reply: 'Re: Mystery to Solve'
dbarnesid
Former Member
- Send Private Message


Boise, ID - USA

Vette(s):
1972 mille miglia red corvette convertible. This is a car currently under restoration. The pic above is of me and my Ph.D. candidate daughter. She, not my Vette, is my pride and joy. Smile...

Joined: 5/29/2013
Posts: 159
That helps some. The research I've done shows a different casting number on the left (3932461) than the right (3989036). Not that it really matters since it surely does work. The only year where my numbers show up was 1965. I guess nothing would surprise me including the factory throwing some old manifolds on the car. :) As you say, unless it is to be an NCRS car it doesn't matter. The car is looking better all the time in spite of things like this and a tranny that is no longer numbers matching due to a Bubbaism. The car will be entered in shows... Just not NCRS shows.

____________________________________
 Reply Reply  Quote Reply w/Quote
 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1]  
 Forums -> C3 Fuel, Emission Control, and Exhaust Systems
(Moderator: Adam Wartell, Norsky, Adams' Apple, kstyer)
 

 
Official C3 Vette Registry Community:
Home | Forums | Email | Who's Online | Clubs | Events | Member Stats

Other Official C3 Vette Registry Areas:
Members | Research | Shop | My Account | About C3VR
 

Corvette is a registered trademark of the General Motors Corporation(GM) & Chevrolet Motor Division. Vette Registries, LLC is responsible for all site content (except for member submitted content or where otherwise noted) and does not claim or imply that Chevrolet or GM is responsible for Official C3 Vette Registry content. Vette Registries, LLC is independent from GM and is not affiliated with, sponsored or supported by GM.  Copyright/trademark/sales mark infringements are not intended, or implied and are in fact used to support GM, Chevrolet and Corvette

Official C3 Vette Registry content is Copyright 2001-2017, Vette Registries, LLC. Content may not be reused without written consent. All Rights Reserved. NS

Corvette (Vette) Model Years on this site: 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 30