How much to have shave off 2006 Tacoma 4.0 heads?

I got a head gasket leak. How much can be safely shaved off these heads in case it’s warped? TY

 

None, according to the SM I have. "If warpage is greater than the maximum, replace the cylinder head."

Maximum warpage:
0.10 mm (0.0039 in.)

By resurfacing the heads and removing the distance between the camshafts and crankshaft you risk having VVTI issues.

Now have folks resurfaced theirs heads? Yes, I am one of them. Per the shop I went to, my heads were out .003". The shop took off .0035" from RH and .0034" from the LH. I have about 40k miles on my head gasket repair. I suppose in hindsight, mine were still within the allowable range.

Others suggest using thicker head gaskets, like Cometic, but I honestly don't know much about that.

 

Had a buddy who had the block decked. Because that was the actual issue. He had to make up difference with headgasket.

This was on a 1grfe 4runner

 

Read up on issues after machining heads.

Head gaskets fail on these trucks but the heads rarely warp.

I haven't machined a cylinder head on a 1GR yet and have never had one leak after gasket replacement.

But milling the head seems to throw the timing off of these engines.

 

I am definitely hoping that this 2006’s heads aren’t warped? It hasn’t overheated as long as I’ve owned it as far as I know

 

If you shave the head, you have to have it shaved to match the new gasket. (Or you WILL have timing issues)
Cometic makes them. They are good stuff.

https://www.cometic.com/applications/automotive/toyota/gr-series/1gr-fe--241ci40l-v6

 

Would you recommend these over OEM or is this gasket just thicker to accommodate a head shave? Thanks Deogee!

 

They are as good as OEM.
But they don't make them in OEM thickness.

If you don't shave the head, go OEM.

If you do, go Cometic.

 

Cometic is a highly reputable brand. As mentioned, if the cylinder head is shaved, a thicker head gasket is required to compensate for the material removed, which is why the Cometic gasket is designed with added thickness.

 

I have to take the heads into a machine shop to see if they are warped first… so I guess I buy the gaskets afterwards then right? TY

 

Or you just go get you a good straight edge and feeler gauges and check it yourself.

 

Don't buy anything until you know the condition of the heads