The block is a 454 used from 72-75 in the Chevelle, up to 76 in passenger cars thru 76 and trucks until 79. Also used in the vette in 72.
The 3919840 was on the 396 from 67-69 and on the 427 from 67-70. It is a closed chamber 106.8 cc head. The 3873858 was used from 66-67 on the 396 and 66-68 on the 427. It is also closed chamber but with a larger 108.9 cc chamber. If you have a question for the list, you should start a new thread to eliminate confusion. Thanks, Dan -------------------------- Sent using BlackBerry -----Original Message----- From: jimmy brown <gymratsbb...@yahoo.com> Sender: chevelle-list-boun...@chevelles.net Date: Mon, 25 Oct 2010 18:51:32 To: The Chevelle Mailing List<chevelle-list@chevelles.net> Reply-To: The Chevelle Mailing List <chevelle-list@chevelles.net> Subject: Re: [Chevelle-list] Exhaust gaskets (Donuts) Help! I need help on id #'s for my 468 big block i tried mortec but i cannot find them engine # 3999289 cyl head # 3873858 cyl head # 3919840 --- On Mon, 10/18/10, Jim Thompson <jimthompso...@gmail.com> wrote: From: Jim Thompson <jimthompso...@gmail.com> Subject: Re: [Chevelle-list] Exhaust gaskets (Donuts) Help! To: "'The Chevelle Mailing List'" <chevelle-list@chevelles.net> Date: Monday, October 18, 2010, 4:09 PM Never had a problem in over thirty years, using Loctite vs. steel and anti seize. In my early days I spent a lot of time on rusted and rounded exhaust bolts. I do suggest anti-seize on the studs when replacing. Hand tighten is sufficient. Tighten on three or four even passes. From: chevelle-list-boun...@chevelles.net [mailto:chevelle-list-boun...@chevelles.net] On Behalf Of Rich Pruett Sent: Monday, October 18, 2010 6:26 AM To: The Chevelle Mailing List Subject: Re: [Chevelle-list] Exhaust gaskets (Donuts) Help! Retorqueing after thermal cycling is a good idea but not brass nuts, they are too soft and may strip out. The only reason a carbon gasket will fail is if air/exhaust is able to pass by it causing it to oxidize. I would take a real close look at your flanges. Are they lining up properly? Is there any nicks or any other imperfections in the mating surfaces that may cause mis-alinement's? You would be looking for any cuts or burrs that would damage the integrity of your sealing media. Tighten your bolts in sequence, assuring that you have a even compression of the gasket. Torque in increments 1/3 of the end result you wish to achieve and then once around to check. Whenever you touch one bolt, it changes to values of the other two. Hope this helps. If the women don't find you handsome, they should at least find you handy. Red Green ----- Original Message ----- From: "Jim Thompson" <jimthompso...@gmail.com> To: "The Chevelle Mailing List" <chevelle-list@chevelles.net> Sent: Friday, October 15, 2010 8:28:51 PM Subject: Re: [Chevelle-list] Exhaust gaskets (Donuts) Help! I never had a gasket fall apart. I suggest new studs, use brass nuts, and locktite. Retighten nuts after an initial warm up period and then again a month later. From: chevelle-list-boun...@chevelles.net [mailto:chevelle-list-boun...@chevelles.net] On Behalf Of flesh...@aol.com Sent: Tuesday, October 12, 2010 5:03 PM To: chevelle-list@chevelles.net Subject: Re: [Chevelle-list] Exhaust gaskets (Donuts) Help! I am having a tough time keeping the donut gasket between the manifold and the exhaust pipe from disintegrating. After installation, it takes about 3-4 months of very little driving and they start leaking again. I have been told that there are metal gaskets (poss copper?) and regular donut gaskets with a metal tube insert that helps the heat/exhaust flow through with less stress to the donut. I have not seen anything like what I am describing and wondered if there was someone out there that had some experience with this problem that they could share. Thanks, Ed 70 Chevelle SS Convertible
