5.7L Gasket

**Meathead** · 04-07-2005, 08:19 AM

I have heard that there is a known issue with the 5.7 L engine.

Around 75,000 miles on the origional gasket it might start leaking. A lot of people have it leak early and have them replaced under warranty. Chevy has since improved the gasket design.

Should I stay away from Felpro? How about the ultra Gray gasket seal? Anyone have any input on this?

**peterK** · 04-07-2005, 08:51 AM

I might have this issue. I'll post it in its own thread also to see if anyone knows about it.

I have been hearing a noise from the engine of my Tahoe for the past week. Sounds like a flat tire hitting the pavement over and over when you're under the hood, and from the inside it almost sounds like a chirping or sipping sound.

It sounds like an exhaust leak that is from the intake manifold somewhere. It's coming from the driver-side intake, right below the TB/Intake mating surface. Could be a bad gasket?

**rbruce** · 05-12-2005, 11:58 AM

Meathead, I'm assuming you are talking about the intake manifold gasket. Mine held up to about 150,000, so I feel luck after reading many posts about this. Leak shows itself at the rear of the engine as a coolant leak.

I replaced with a Felpro kit. Had the help of a mechanic friend. Job took about 5.5 hours, probably would have been more like 8 if I done it on my own. Having the correct tools really helped in two places, removing one of the pulleys, and resetting the timing, which can only be done correctly with a diagnostic computer.

Good luck.

**ARNIE** · 05-12-2005, 09:45 PM

Which gasket?

**Steve** · 05-13-2005, 09:39 AM

That's got to be the intake manifold gasket. I've read that there were problems on several years with the factory gasket. I've not heard of a known problem with other ones like the head or valve cover or pan gasket, just the intake..

**ARNIE** · 05-13-2005, 04:45 PM

Those gaskets usually begin leaking around 75,000 or so. If you do it yourself, 2 words of advice. Corteco gaskets and ultra gray. Corteco is a superior product to Felpro. Corteco is the original Chevy gasket division of General Motors.

**97tahoeboy** · 07-29-2005, 11:05 AM

hed my intakes go at about 80,000, took it in and shop did it in a bout 4hrs. but they're real good with those gaskets, ( that shop gets a lot of intakes)

**Steve** · 08-15-2005, 09:52 AM

4 hours of labor, at what $70/hour?

It's been a while since I've had to replace anything like that. I live in rented space right now, no room for a project like that.

**surfin_phil** · 02-22-2006, 01:47 PM

I think I now know why my Tahoe starts miss firing when going up steep hills. Runs fine otherwise but I have noticed my coolant disappearing and pressure test showed no leaks.

My question for the group:
Is GM stepping up on this issue? obviously a serious defect.
If DEXCOOL is the problem, should I use something else before my engine rots away?

Thinking of joining the class action suit if dexcool is the cause.
Anyone know more about this?

Thanks.