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#1
03-11-2018, 09:15 AM
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exhaust manifold difference?
I have the correct 64 drivers side exhaust manifold for dual exhaust but I have a passenger side which numbers come out to be a 66 with the heat riser valve. Are the 64 and 66 manifolds the same except for part numbers? Will the 66 bolt up and work?
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#2
03-11-2018, 12:49 PM
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The 64 heat riser “weight” is different from the 65 and newer style.
Below is a NOS 64 RH exhaust manifold (first 4 pics). Last pic is a pair of 65 manifolds. Same bolt pattern on all of them. Chris.
__________________
1) 65 GTO Survivor. 43,440 Original Miles. “Factory” Mayfair Maize Paint with Black Pinstripe, Black Cordova Top, Black Interior, OEM Numbers Matching Powertrain. Purchased from the Lady that bought it new. Baltimore Built (11A). 2) 66 GTO Survivor. “Factory” Cameo Ivory Paint with Red Pinstripe, Red Interior. OEM Numbers Matching Powertrain. Tri-Power (OEM Vacuum Linkage), Automatic "YR" code (1759 Produced). Fremont Built (01B), with the Rare 614 Option. Last edited by 60sstuff; 03-11-2018 at 12:55 PM. |
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#3
03-11-2018, 04:25 PM
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Hello Chris. I see your 64 manifold does not have the little anti rattle spring but the 65 does. Did they not use that spring in 64?? I don't know. "Bill"!
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#4
03-11-2018, 05:45 PM
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I'm not too worried about the heat riser, I'm probably going to make sure it stays open. I'm more worried about flow and if it is basically the same if I go with the 64 on one side and 66 on the other.
Thank you for all the help and pictures! |
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#5
03-11-2018, 07:03 PM
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Quote:
I purchased the NOS 64 manifold as shown. I’m sure it had the anti rattle spring at one time. I have an NOS Spring and my MPC shows 63-67 All exc. T/6 #521580. Chris.
__________________
1) 65 GTO Survivor. 43,440 Original Miles. “Factory” Mayfair Maize Paint with Black Pinstripe, Black Cordova Top, Black Interior, OEM Numbers Matching Powertrain. Purchased from the Lady that bought it new. Baltimore Built (11A). 2) 66 GTO Survivor. “Factory” Cameo Ivory Paint with Red Pinstripe, Red Interior. OEM Numbers Matching Powertrain. Tri-Power (OEM Vacuum Linkage), Automatic "YR" code (1759 Produced). Fremont Built (01B), with the Rare 614 Option. |
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#6
03-11-2018, 08:44 PM
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As always, Chris, many thanks!!!! "Bill"!
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#7
03-11-2018, 09:17 PM
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Quote:
You're good.
__________________
1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
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#8
03-12-2018, 06:54 AM
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Thank you! Were the down pipes 2 1/2" from the manifolds in 64?
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#9
03-12-2018, 06:33 PM
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I remember 2-1/4" but that was a long time ago with a lot of header swaps after those days.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#10
03-12-2018, 08:20 PM
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For '64 GTO
Head pipes were 2.25" Mufflers were 2.25" inlet and 2.00" outlet Tailpipes were 2.00" Same exhaust for auto and manual trans '65 was different. |
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