Head gaskets brand? metal? thickness?

cre · 10-26-2011, 10:54 PM

Cometic and Titan (strongly believed to be made by Cometic) are the most forgiving, but yes, any MHG requires extra preparation. The block and deck must be more than just cut, they need to be very smooth. If your shop can't provide a very low RA then you will need to lap the block with a precision lapping plate and diamond lapping compound of progressively finer grades.

Torque head bolts according to the manufacturer's specs and according to the type of lubricant you are using. Make sure to chase the threads in the block as well, this is critical.

The thickness is chosen based on a number of criteria but yes, for your needs it will be primarily based on how much material is removed from head and block. Stock is 1.37mm compressed, IIRC. To maintain the stock C/R you would take 1.37mm + whatever is removed and that is the thickness you would want. If you want to increase your C/R you would go with a stock HG or thinner after the head and block are shaved.... the opposite to lower the C/R.

EDIT: Oh and the link not found thing.... possibly the placeholder for an advertisement for an advertiser who's not up and running? I don't see it on my screen. If it's between the first and second post then that is what it is... I've seen it using other browsers before. I'm not sure why the forum owner hasn't fixed it.

10-26-2011, 10:54 PM	#3
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Cometic and Titan (strongly believed to be made by Cometic) are the most forgiving, but yes, any MHG requires extra preparation. The block and deck must be more than just cut, they need to be very smooth. If your shop can't provide a very low RA then you will need to lap the block with a precision lapping plate and diamond lapping compound of progressively finer grades. Torque head bolts according to the manufacturer's specs and according to the type of lubricant you are using. Make sure to chase the threads in the block as well, this is critical. The thickness is chosen based on a number of criteria but yes, for your needs it will be primarily based on how much material is removed from head and block. Stock is 1.37mm compressed, IIRC. To maintain the stock C/R you would take 1.37mm + whatever is removed and that is the thickness you would want. If you want to increase your C/R you would go with a stock HG or thinner after the head and block are shaved.... the opposite to lower the C/R. EDIT: Oh and the link not found thing.... possibly the placeholder for an advertisement for an advertiser who's not up and running? I don't see it on my screen. If it's between the first and second post then that is what it is... I've seen it using other browsers before. I'm not sure why the forum owner hasn't fixed it. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar ---> Last edited by cre; 10-26-2011 at 10:57 PM.