Engine freshening question

H

hal stclair

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Mar 26, 2013
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I'm about to install the 403 I removed from my 77 Royale for the diesel transplant into a 1975 we plan on giving to our daughter. The motor had 86,000
miles on the clock and ran well, used about a quart of oil between 1500-2000 miles and oil pressure seemed fine. I plan on replacing the timing
chain/gears but am undecided weather to pull the heads and freshen the valves. I've heard the siamese cylinders tend to be rough on head gaskets but
don't know if that is a real concern or not. I remember years ago where a valve job sometimes created issues with increased blow by so I'm on the
fence on that. I know it would be WAY easier to attack while out in the open than back inside the hole for sure. Any suggestions?
Thanks, Hal
--
1977 Royale 101348,

1977 Royale 101586, Diesel powered,

1974 Eagle Bus 45',w/slideout
 
Yes, Hal. Do the rings and bearings too. Along with a standard duty oil
pump and a true roller timing chain set. Check valve lift on all the valves
with a dial gage. If there is more than .020" difference between them,
replace the cam and lifters as well. You won't be sorry.
Jim Hupy

> I'm about to install the 403 I removed from my 77 Royale for the diesel
> transplant into a 1975 we plan on giving to our daughter. The motor had
> 86,000
> miles on the clock and ran well, used about a quart of oil between
> 1500-2000 miles and oil pressure seemed fine. I plan on replacing the timing
> chain/gears but am undecided weather to pull the heads and freshen the
> valves. I've heard the siamese cylinders tend to be rough on head gaskets
> but
> don't know if that is a real concern or not. I remember years ago where a
> valve job sometimes created issues with increased blow by so I'm on the
> fence on that. I know it would be WAY easier to attack while out in the
> open than back inside the hole for sure. Any suggestions?
> Thanks, Hal
> --
> 1977 Royale 101348,
>
> 1977 Royale 101586, Diesel powered,
>
> 1974 Eagle Bus 45',w/slideout
>
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> GMCnet mailing list
> Unsubscribe or Change List Options:
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>
 
Hal

You might read Larry's article in tech, GMC Easter States

http://www.gmceast.com/technical/Weidner_Rebuilding_that_Motor.pdf

Dennis

> I'm about to install the 403 I removed from my 77 Royale for the diesel transplant into a 1975 we plan on giving to our daughter. The motor had
> 86,000 miles on the clock and ran well, used about a quart of oil between 1500-2000 miles and oil pressure seemed fine. I plan on replacing the
> timing chain/gears but am undecided weather to pull the heads and freshen the valves. I've heard the siamese cylinders tend to be rough on head
> gaskets but don't know if that is a real concern or not. I remember years ago where a valve job sometimes created issues with increased blow by so
> I'm on the fence on that. I know it would be WAY easier to attack while out in the open than back inside the hole. Any suggestions?
> Thanks, Hal

--
Dennis S
73 Painted Desert 230
Memphis TN Metro
 
Nice read ... as I will be refreshing my 403 good info thanks - Dave
--
'78 Palm Beach car nut & new to RV'ing
26 ft. 403 OEM wheels, 2 ACs, Pod, ladder, macerator
On FaceBook as David Martin Servati
585-953-53OO call or text
 
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