Vandit

What's the torque value for the 3 10mm fasteners that bolt these to the heads?

axl911

I think the specs for these are something really small like the valve covers. I did mine hand tight. The rubber seal on the bottom of the stack provides the seal.

What are you doing taking these out?

Vandit

All were cracked around all 3 fastening points, seal at base was brittle and falling into the port, lots of gunk around the outside base of each makes it seems like it was blowing out somehow.


Note spray over top of valve cover.



Failing seals falling into intake port, also note crack on intake manifold, barely visible top right. All corners on all intake manifolds were cracked like that.

axl911

Yep...same as mine (except for the oil blowing out). It gets hot, the plastic get brittle and crack. When I took mine out to replace, the stacks were just about to crumble.

JasonAndreas

Not sure how much it matters but the 993 doesn't use studs and nuts for these like your 964, it has 6mm screws.

sonny1

18in pnds.

Vandit

^so that's 1.5ft/lbs?

bcameron59

I used 7Nm