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I had some spare intake washers from an LS1 intake manifold so I used them, but they still don't look right. I'm afraid to torque this thing down like this?
I'm just talking about the diameter of the head over the hole on the intake. The bolt head is barely larger than the hole. A washer the diameter of the OEM bolt rubber portion is what I'd think would be necessary. I started to torque them down and I swear I could see the plastic area start to cave in around 70 inch lbs so I stopped. I'll grab some washers. Odd ICT billet sells these without the washers though. Figure if I'm paying $17 for a few bolts they would at least come with washers...
This pic shows what I’m talking about a little better.
The LS1 manifolds had small holes/perches for the bolts. The TBSS has ¼” “ish” holes on 1” perches. So the tiny head diameter is barely larger than the ¼” hole. Had me nervous is all. I contacted ICT billet and they said they would send me some ¾” washers if I wanted. Think I’ll head down to the hardware store and get some 1” washers instead.
Any time I do a project where the heads come off, I always drill and tap the intake bolts to accept a 5/16 bolt. Also drill the intake bolt holes out accordingly.
There is just something about those little chicken **** metric bolts I don't like.
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Truck intake bolt head diameter? 
