L98 Intake manifold leaking

[Mart]

I pretty sure my intake manifold has a leak at the rear, the odd drip of oil and if it sits for a few days the coolant will leak at the back of the intake not sure exactly where.

Has anyone else had this problem, is it a huge job to reseal the intake (new gaskets) etc. Or is it worth having a shop do the work.

Any advice would be great.
Mart

 

[Mart]

^^^

 

[bradvette]

The previous owner had the intake gasket replaced on my '90 L98 in May 2002 when it was at 61,000 mi......the shop charged
about $500 total for intake manifold gaskets, coolant, sealer, t-stat & gasket and engine oil change, labor was 6.4 hours.

Its my understanding that 5-6 hours is normal to replace the gasket, and this is quite common on L98's.

My question to anyone who might know is: which years of the L98 are more susceptible to this, and how often in the lifespan of the car would the intake gasket need reaplced?

 

[8388]

Pretty much all L98 are susceptible. The black factory intake gasket is the culprit. I would highly recommend going back with felpro blues, and as an added safety measure I'd apply some RTV around the water passages.

 

[mmark2]

I had to have my intake gasket replaced at 60,000 also, as did a friend of mine who has an 85. The mechanic at the local Chevy told me that he's worked on quite a few L98's over the years and at 60,000 it's pretty common to see this.