What am I doing wrong?

[Z26-T]

I mentioned earlier proper surfacing RA of aluminum heads if they had been surfaced. I wouldn't say aluminum heads warp easily without mentioning "with overheating", especially since the 3400 gaskets don't seem to be failing easily. This may be the result of the increased bore of the 3500 needing a stronger gasket to make up for the reduced gasket area under clamping pressure.

So 3400/3500 hybrid is the best of both worlds? More deck surface area, slightly lower CR , and the better flowing heads.

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[95SleeperAcheiva]

I don't mean to rain on anyone's parade here, but KISS method. I agree the FP gaskets are known for being weak, but did you deck the heads after the last HG popped? and/or did you atleast check them with a feeler gauge and "real" straight edge for "true"? Also it's rare on iron, but check the block too.

[TGP37]

I too have had my Felpro SD head gaskets fail. And they're even claimed to have 3 steel layers. I got the stock gaskets now.

You seem like you know what you are doing but, did you clean the thread passages in the block? I read up to 50% less clamping force can be experienced from improperly torquing the bolts.

Sorry you gotta go through this.....sucks.

[Jonpro03]

Wow, I sold this car a while ago!

The problem was the restrictive exhaust. The head gaskets were melting under extended WOT runs with high boost because cylinder temps got too high.

[TGP37]

LOL, I guess I should look at the time stamps...haha

[Jonpro03]

No worries!