| Re: [GMCnet] losing power [message #220249] |
Wed, 28 August 2013 17:51  |
KB
Messages: 1262
Registered: September 2009
Karma: 0
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Senior Member |
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> Karen, what timing chain set did you use, and where did you time it.?
It was the melling equivalent to the Cloyes street double true roller
(melling 40409 I believe). It was installed by the builders at 0.
We didn't change it because we figured the RV cam already puts
the power lower than stock.
thanks
Karen
1973 23'
1975 26'
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Karen
1975 26'
San Jose, CA
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| Re: [GMCnet] losing power [message #220252 is a reply to message #220249] |
Wed, 28 August 2013 18:05  |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Ok. Double check the throttle body hold down bolts, and all your vacuum
lines. Temporarily block off the cruise control at the back of the
manifold. Steady idle at 750 rpm on a new engine should yield 18" of
mercury with a rock steady needle. If it is not steady, perform a
compression test or a cylinder balance test. RV camshafts usually pull high
vacuum at low speeds. Did you check your intake manifold for cracks? Enough
for now.
Jim Hupy
Salem, Or.
78 gmc Royale 403
On Aug 28, 2013 3:51 PM, "KB" <kab7@sonic.net> wrote:
> > Karen, what timing chain set did you use, and where did you time it.?
>
>
> It was the melling equivalent to the Cloyes street double true roller
> (melling 40409 I believe). It was installed by the builders at 0.
> We didn't change it because we figured the RV cam already puts
> the power lower than stock.
>
> thanks
> Karen
> 1973 23'
> 1975 26'
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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