Copper Head Gasket Fit

[Smt]

Hi all,

1st build..

Looking to check correct fit between head and jug.
I forgot what stock head looked like before I took it off.

Seems like there is a gap or does it just compress along inside perimeter.
I gradually tightened to all head nuts to 13 ft lbs

I'm using a .4mm also have available a .2mm.
Should I try .2mm, if I run 93 Octane?

thanks

 

[Street Ryderz]

Hi all,

1st build..

Looking to check correct fit between head and jug.
I forgot what stock head looked like before I took it off.

Seems like there is a gap or does it just compress along inside perimeter.
I gradually tightened to all head nuts to 13 ft lbs

I'm using a .4mm also have available a .2mm.
Should I try .2mm, if I run 93 Octane?

thanks

Thats normal fit because the head has a raised surface (crush ring) that compresses the gasket.Your squish clearence is what should determine the gasket thickness.Also paying extra for 93 octane to get less from it why? These engines dont have crazy high c/r to require the reduced burn rate of the higher octane,87 octane at 32:1 and good oil works best all around.

 

[catman78]

Ok thanks.
Yeah, they are a bit crude. I did a full build on a Predator 212 for a go kart and I thought that was rough around the edges but these engines take the cake.

Cheap, dangerous and fun.. what could go wrong.