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how to replace a lower intake gasket on a 3.4 dohc


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#21 GTP091

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Posted 15 March 2010 - 07:51 AM

Just wanted to note: there are two nuts to remove on the upper plentum, in addition to the 7 bolts.

It would also be a good idea to stuff clean rags into the ports to keep debris from entering the cylinders while the intake is off.

#22 Red Nightmare

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Posted 13 January 2011 - 05:24 AM

The dist shaft cap - It doesn't pull up very much at all. Maybe like 1/8 inch. the best way to clean under it I found was to soak some thick string in solvent/mineral spirits and work it around the thing... tedious cleaning job around there but once you do that then you can re-seal, I just crammed some high-temp RTV under it best I could and spun the cap to work it around, put a bit more in, spun cap, and put the clamp back on. Seems to be holding nicely for now. If you have to pull the heads for whatever other reason night as well fix it properly but the above rig seems to do nicely for a while.
1994 Pontiac Grand Prix GTP. 3.4 DOHC with 197,000 miles, 4 speed automatic.

#23 cutty collector

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Posted 08 October 2016 - 12:46 AM

If you do want to permanently repair it with the head off use a standard small block distributer base gasket and it will never leak again we used to do it a the gm dealer I worked at whenever we did intake gaskets on 3100 and 3400 engines
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#24 Psych0matt

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Posted 08 October 2016 - 01:02 AM

If you do want to permanently repair it with the head off use a standard small block distributer base gasket and it will never leak again we used to do it a the gm dealer I worked at whenever we did intake gaskets on 3100 and 3400 engines

I'm pretty sure he didn't wait five years to get started on this project...
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'92 5 speed GTP - Mod list _____ '06 Grand Prix SE - Daily Driver

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#25 Imp558

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Posted 08 October 2016 - 02:24 AM

You don't KNOW that for sure.
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#26 Galaxie500XL

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Posted 13 November 2016 - 03:18 PM

I believe that the torque figure should be INCH pounds, not foot-pounds.
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1993 LT1 Corvette Coupe

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#27 Psych0matt

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Posted 14 November 2016 - 04:10 PM

I believe that the torque figure should be INCH pounds, not foot-pounds.

ill give you a foot-pound right in your ass!
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#28 Galaxie500XL

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Posted 14 November 2016 - 06:43 PM

The plenum bolts, I meant. 


galaxie500xl

1993 LT1 Corvette Coupe

1988 Camaro IROC-Z 5.7 TPI 5-speed

2015 Chevrolet Equinox LTZ

GONE to a new home... 1995 Cutlass DOHC Convertible, 3rd Quarter 2012 W-Body.com COTQ


#29 Padgett

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Posted 14 November 2016 - 07:01 PM

Mine says 18 lb-ft and 24 n-m for the intake manifold bolts. 24 in-lb is 2 ft-lb and not very tight.



#30 cdn_olds_94

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Posted 30 May 2018 - 01:41 AM

Did this on my Cutlass a few weeks ago. Took all day but it was a job that needed to be done. I also changed the spark plugs while I was at it and she purr's like a kitten now.


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#31 GTP091

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Posted 01 June 2018 - 01:33 AM

What symptoms did you have??

#32 cdn_olds_94

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Posted 05 June 2018 - 12:17 AM

What symptoms did you have??

Rough start when cold, rough idle when cold, bad gas mileage. 






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