Head gasket thickness. Help needed! (1 Viewer)

Joined
Jan 29, 2019
Messages
14
Location
Portland, Oregon
Hi, everyone. I need help!

My head gasket failed and I am in the middle of a light-rebuild of my engine. Block had some pitting in the area of the HG failure so I had my machine shop surface the deck as well.
The head was milled 0.008" and the block 0.009". All together I have lost 0.017" or 0.43 mm.

I am wondering if I can still use OEM HG, or I need to go with Cometic HG.

Also, when I measured my used HG it was on average 0.043", but then I kept reading that compressed head gasket thickness is 0.050" on our engines. I am wondering if I made a mistake when measurements were taken.

Thank you for everyone's input.
 
Joined
Nov 1, 2009
Messages
1,531
Location
South Central PA
Would have rather had a micrometer, but this is what I have on hand.

20200908_120208[1].jpg
 

inkpot

SILVER Star
Joined
Jan 30, 2003
Messages
13,676
Location
All over Arizona
I had about that much milled off my head hwile I had it out due to a vave problem. I reinstalled it with a stock gasket and it works just fine. the 1fzfe is a non interference motor, so unlikely you will have a valve clearance issue, and you will not realize much performance difference for the slight increase in compression. I have run about 50,000 miles since working the head, with an overboosted Supercharger, and it still runs fine at 230,000.
 
Joined
Jan 29, 2019
Messages
14
Location
Portland, Oregon
I had about that much milled off my head hwile I had it out due to a vave problem. I reinstalled it with a stock gasket and it works just fine. the 1fzfe is a non interference motor, so unlikely you will have a valve clearance issue, and you will not realize much performance difference for the slight increase in compression. I have run about 50,000 miles since working the head, with an overboosted Supercharger, and it still runs fine at 230,000.
Awesome feedback! Thank you.
 
Joined
Jan 29, 2019
Messages
14
Location
Portland, Oregon
A little bit of an update. Just got off the phone with Cometic. They have OEM compressed gasket thickness at 0.040" in their system. And , currently there is about a 4 week lead time on all of their gaskets.
 

jjdeneen918

SILVER Star
Joined
Jul 23, 2008
Messages
958
Location
Long Beach, CA
I went Cometic last year. With their custom sizes, I brought it back to stock tolerances after shaving about 0.006” off the head.

I’ve been running great with a turbo-installed engine.
 

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