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.
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
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!
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.
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.
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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