Cylinder head Bolts

anyone know what size is the spline socket thing (triple square?) is for removing these? just started stripping the engine and this is holding me back.. need to know what size to get in case my mate has one,  cheers.

I'm sure I read somewhere on here that big block petrol engines are M11, and diesel engines are M12.

I can't be sure though - I'd like to know for sure as I need to buy a tool for myself.

Rich

Just as you say Rich.

Cool - thanks

Rich

cheers

Resurrecting an old thread - my usual tool supplier can't seem to source an M11 12-spline tool - he can do M10 or M12.

Could someone who has bought one let me know where they got it from, and what make it is?

Thanks

Rich

Big block petrol are M10 aren't they? I can't remember now, its been so long ago. They're not M11 though.

Thanks Paul

Can anyone else confirm the thread size for a big block petrol engine?

Rich

The one I use has got Draper-Expert scmv M12 stamped on it so I suppose they're M12 but it doesn't look that big.

just done my head, T55 torx tool is the one you want bud to remove and re-fit cylinder head bolts
Pete :wink:

mcscrew said

Thanks Paul

Can anyone else confirm the thread size for a big block petrol engine?

Rich

I've finally sorted this out - I bought a tool yesterday and it fits.

The tool you need for a big block petrol engine is an M12 triple-square / 12-splined tool.

Gedore do an excellent one on a 1/2" drive which is quite long and reaches inside the head easily. Their part no. is INX 19 L 12-100.

HTH

Rich

hi

just did my head its m12 u need