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Re: Head gasket leak? [message #328577 is a reply to message #328574]

Thu, 25 January 2018 10:32

Larry

Messages: 2875
Registered: January 2004
Location: Menomonie, WI

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Senior Member

shaunone wrote on Thu, 25 January 2018 08:20

What John said. When your speed gets down to 45-50, drop it into 'S' manually

Depending the final drive you are using (3.08, 3.21, 3.42, 3.50 3.70 or 4.10) 50 MPH may be be high or low in terms of engine RPM. Personally, I would use a 2400rpm rule. If you are at WOT and RPM drops to 2400rpm, that is the time to shift manually into "S"...or second. Then again when rpm drops to 2400, manually shift into first. For the 455 or 500, IMO, when climbing grade we should try to keep the rpm around 3000 or so. The 403 may run 500rpm or so higher. One must keep in mind what Dick Paterson has reminded us of, that because the oil pump runs off the the camshaft, it is turning at half the speed of the crank. Keeping rpm up keeps a good supply of oil going to the rod and main bearings under these high load conditions. So...just what I'd do.

Larry

78 Royale w/500 Caddy
Menomonie, WI.

[Updated on: Thu, 25 January 2018 10:33]

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[Message index]

		Head gasket leak? By: Jimmy_Bonez on Mon, 15 January 2018 18:01
		Re: Head gasket leak? By: 77Royale on Mon, 15 January 2018 18:29
		Re: [GMCnet] Head gasket leak? By: jimk on Mon, 15 January 2018 18:54
		Re: [GMCnet] Head gasket leak? By: Matt Colie on Mon, 15 January 2018 19:18
		Re: Head gasket leak? By: Matt Colie on Mon, 15 January 2018 19:12
		Re: Head gasket leak? By: Larry on Mon, 15 January 2018 20:25
		Re: [GMCnet] Head gasket leak? By: bdub on Mon, 15 January 2018 20:25
		Re: [GMCnet] Head gasket leak? By: bdub on Mon, 15 January 2018 20:32
		Re: [GMCnet] Head gasket leak? By: tphipps on Tue, 16 January 2018 07:55
		Re: [GMCnet] Head gasket leak? By: Ken Burton on Tue, 16 January 2018 10:14
		Re: Head gasket leak? By: Jimmy_Bonez on Tue, 16 January 2018 10:47
		Re: [GMCnet] Head gasket leak? By: Richard Denney on Tue, 16 January 2018 11:08
		Re: Head gasket leak? By: Jimmy_Bonez on Fri, 19 January 2018 21:46
		Re: Head gasket leak? By: 77Royale on Sat, 20 January 2018 11:14
		Re: Head gasket leak? By: Jimmy_Bonez on Sat, 20 January 2018 12:04
		Re: Head gasket leak? By: tphipps on Sat, 20 January 2018 17:28
		Re: Head gasket leak? By: Ken Burton on Sun, 21 January 2018 04:14
		Re: [GMCnet] Head gasket leak? By: USAussie on Sun, 21 January 2018 04:52
		Re: [GMCnet] Head gasket leak? By: Ken Burton on Sun, 21 January 2018 05:40
		Re: Head gasket leak? By: Jimmy_Bonez on Wed, 24 January 2018 09:23
		Re: Head gasket leak? By: Ken Burton on Wed, 24 January 2018 19:47
		Re: Head gasket leak? By: JohnL455 on Wed, 24 January 2018 09:46
		Re: Head gasket leak? By: shaunone on Thu, 25 January 2018 08:20
		Re: Head gasket leak? By: Larry on Thu, 25 January 2018 10:32
		Re: Head gasket leak? By: shaunone on Thu, 25 January 2018 13:00
		Re: Head gasket leak? By: jhbridges on Thu, 25 January 2018 12:58
		Re: Head gasket leak? By: Ken Burton on Thu, 25 January 2018 18:45
		Re: Head gasket leak? By: Jimmy_Bonez on Thu, 25 January 2018 20:24
		Re: Head gasket leak? By: Ken Burton on Thu, 25 January 2018 22:05

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