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Re: [GMCnet] replacing driver's side head on a 455 [message #362744 is a reply to message #362743]

Tue, 09 March 2021 11:16

James Hupy

Messages: 6806
Registered: May 2010

Karma:

Senior Member

There are only two types of cast iron exhaust manifolds. Cracked ones, and
ones that haven't cracked yet. The real key to prevention is, rich mixture
combined with a soft cushion type gasket PROPERLY torqued, and a non rigid
connection to the exhaust pipes. If they have a white appearance near the
ports, you are too lean on the w.o.t. mixture.
Jim Hupy
Salem, Oregon

On Tue, Mar 9, 2021, 8:03 AM Robert J. Gogan via Gmclist <
gmclist@list.gmcnet.org> wrote:

> I have replaced so many cracked exhaust manifolds that I don't even
> remember the count. Finally switched to headers and increased the
> carburetor jet
> sizes by 2. I'll never go back to manifolds with the shock cooling and
> cracking they were susceptible to with a lean carb.
>
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[Message index]

		replacing driver's side head on a 455 By: rgogan on Mon, 08 March 2021 14:46
		Re: [GMCnet] replacing driver's side head on a 455 By: stu@97381.com, Emery on Mon, 08 March 2021 14:55
		Re: replacing driver's side head on a 455 By: Matt Colie on Mon, 08 March 2021 16:26
		Re: replacing driver's side head on a 455 By: Matt Colie on Mon, 22 March 2021 13:50
		Re: replacing driver's side head on a 455 By: rgogan on Thu, 24 June 2021 10:05
		[GMCnet] Re: replacing driver's side head on a 455 By: jimk on Thu, 24 June 2021 10:38
		Re: replacing driver's side head on a 455 By: JohnL455 on Mon, 08 March 2021 17:51
		Re: replacing driver's side head on a 455 By: rgogan on Tue, 09 March 2021 10:02
		Re: [GMCnet] replacing driver's side head on a 455 By: James Hupy on Tue, 09 March 2021 11:16
		Re: replacing driver's side head on a 455 By: rgogan on Mon, 15 March 2021 12:48
		Re: replacing driver's side head on a 455 By: Ken Burton on Tue, 16 March 2021 03:39
		Re: replacing driver's side head on a 455 By: JohnL455 on Tue, 16 March 2021 08:55
		[GMCnet] Re: replacing driver's side head on a 455 By: James Hupy on Tue, 16 March 2021 11:28
		[GMCnet] Re: replacing driver's side head on a 455 By: Ken Henderson on Tue, 16 March 2021 11:40
		Re: [GMCnet] Re: replacing driver's side head on a 455 By: rgogan on Sun, 21 March 2021 19:46
		Re: replacing driver's side head on a 455 By: jhbridges on Mon, 22 March 2021 11:03
		Re: replacing driver's side head on a 455 By: Matt Colie on Mon, 22 March 2021 13:47
		Re: replacing driver's side head on a 455 By: rgogan on Mon, 22 March 2021 18:30
		[GMCnet] Re: replacing driver's side head on a 455 By: stu@97381.com, Emery on Mon, 22 March 2021 21:16
		[GMCnet] Re: replacing driver's side head on a 455 By: stu@97381.com, Emery on Mon, 22 March 2021 21:25

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