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How do you replace the intake manifold gaskets on a 1996 Chevy vortec?

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2008-03-12 16:22:42
2008-03-12 16:22:42

I have a 97 Astro that is leaking. The dealer ship quoted a price of $650. minimum. I know there is a lower and upper manifold gaskets.I'm faced and with cruise control and fuel injection and I am a little aprehensive. But being out of options and low on funds due to uncle sam and cost of living increases and not alot of work I might have to take it on. Any help would be cool. I have been driving GM products for 30 years and have never had a intake manifold gasket blow.

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That is a very COMMON PROBLEM WITH those engines. You need to replace the intake manifold gaskets to fix that problem.

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intake manifold gaskets need replacing, i have repaired several of these

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you can as long as you use your TBI heads if you want to use the vortec heads with TBI you will need a special intake manifold or a carb manifold with a adapter to mount your throttle body to the carb manifold heres some more info TBI heads will mount to the vortec block TBI intake manifold has 12 bolts vortec intake manifold has 8 bolts

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We have had several 4.3L engines at work develop coolant leaks from the intake manifold gaskets failing.

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I live in KY. And the going labor rate on that job is 250.00 to 300.00 dollars to replace the intake manifold gasket.I charge 250.00 $ when I do them at the shop.

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Look at the intake manifold. A vortec engine has 8ea. All the others have 12ea.

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It will as long as the 305 is a VORTEC ENGINE TOO.

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On valley cover plate underneath intake manifold. Must remove intake manifold to get to them.

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A vortec 350 has a two piece intake manifold, with the upper portion being plastic.

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yes they will fit, but you will need an intake manifold compatible with vortec heads if you plan on reusing the carburetor

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this is a common problem with the Vortec engine and the manifold gaskets that GM uses. In fact, if you do a search on GM manifold gasket you'll see all the chatter about a class action law suite related to this problem. Bottom line is that you'll need to replace the manifold gasket - preferably with an after market replacement (like Fel Pro) so you don't have to do it again!

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yes they will bolt on to the block. valve train will be the same. valve covers will be the same. but you will have to buy a different intake manifold. the bolt pattern and gaskets for the intake is different. there are aftermarket parts available for this swap

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If engine is running good, Then the intake manifold gaskets or most likely the source of the problem. That is common on 305-350 Vortec engines need to know what it is your working on, YEAR AND TYPE That would help the answer.

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That engine has 2 of them and there underneith the intake manifold. You will have to remove the intake to get to them.

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approximatly $545 and it takes about 6-8 hours if you do it yourself and take your time 10-12 hours and the kit is worth 69 dollars and includeds all the necessary gaskets there are great websites with pictures that show exactyly how to do it and they are very informative also good luck

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That is a very common problem with the vortec engines.You will have to replace the intake manifold GASKET. If you run your finger around the 4 corners of the intake were it sets against the heads you will probley find the leak.Have you run the engine HOT or over heated it ? If you did then you may have damaged the head gasket / gaskets and that would cause a rough idlel.

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The big difference with a vortec vs normal gm motors is vortec has different head design and the intake manifold have bigger runners. In 1995 vortec heads still used T.B.I injection with the top end of the engine being vortec head and intake mainfold.

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Take off valve covers, heads an intake manifold with throttle body, pull out lifters and pushrods and simply replace It's not necessary to remove the heads for this procedure.

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no, the bolt pattern on the small block Chevy intake manifold changed in '87 to the vortec head design, but if it doesnt have the centerbolt valve covers, then it will.

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Idle speed on the L29 "Vortec 454" is determined by the Powertrain Control Module (PCM) electronically. You cannot adjust the idle speed with a setscrew or any other mechnical adjustment. The PCM chooses idle speed based on coolant temperature, A/C clutch status, transmission gear status, and startup conditions. If you find that the idle is too high when it should normally be lower it could mean that the Idle Air Control (IAC) motor has failed or is bound up. This component is located on the forward-facing side of the throttle body (passenger side). If idle is still too high it may have intake manifold gasket failure causing air to leak in. There are two set of intake manifold gaskets on the L29 engine - the lower gaskets are between the lower intake and the heads and the upper gaskets are between the lower and upper halves of the intake manifold assembly. If you are not familiar with how to reinstall the distributor on an L29 do not attempt distributor or intake manifold removal.

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Yes an 89 350 will bolt up to original Vortec heads. However, Vortec heads have an 8 bolt inatke manifold that is different from the standard 89' intake. Its worth mentioning that the intake manifolds changed in 1986. Prior to 1986 all intake manifolds for a sbc had 12 bolts. These 12 bolts all secured the intake to the head at the same angle. In 1986, or primarily in 1987 the intakes 4 center bolts were changed to a steeper angle. With the introduction of the vortec head came a new 8 bolt intake eliminating the 4 center bolts. If you plan to use Vortec heads on any V8 be it a 305,327,350 or bigger, you will need a Vortec intake manifold as well. You can also buy an after market intake to run a carburetor on a set of Vortec heads in place of the TBI injection.

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it is under the upper intake manifold, if you have a vortec engine


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