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Re: [GMCnet] Blackstone Labs and ZDDP oils [message #109619 is a reply to message #109589] Fri, 24 December 2010 06:32 Go to previous messageGo to previous message
Steven Ferguson is currently offline  Steven Ferguson   United States
Messages: 3447
Registered: May 2006
Karma:
Senior Member
Poor fitment of the intake is usually, and I mean usually, the result of
decking the block and milling the heads. Quality machine shops provide a
spec sheet on the machine work so there 's no mystery when the assembler is
putting the engine together. It's when they don't supply that information
that the stuff hits the fan.
I saw a GMC engine that had less than 100 miles on it that had leaned out
so bad because of this that most of the pistons had lost chunks of the
tops. The owner said the engine temp never rose above the thermostat,all of
a sudden the engine just started eating itself.

On Thu, Dec 23, 2010 at 4:49 PM, fred veenschoten <fredntoni@cox.net> wrote:

>
>
> James Hupy wrote on Wed, 22 December 2010 22:53
> > Fred, one of the GMC Cascaders just rebuilt his 455 and it was using oil
> > like crazy. He was using a Rockwell aluminum intake manifold with
> throttle
> > body FI. What he found was his intake manifold didn't have a good seal to
> > the valley, and it was injesting oil from that source. He removed the
> intake
> > & resealed it & his oil burning stopped. Engine ran very well and the
> plugs
> > looked good. Had us scratching our heads for a while before he found it.
> > Jim Hupy
> > Salem, Or
> > 78 GMC Royale 403
>
> someone else here had that same problem with the alum GMC intake.
>
> --
> Fred V
> '77 Royale RB 455
> P'cola, Fl
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> GMCnet mailing list
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>



--
Steve Ferguson
Sierra Vista, AZ
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