Ok, doing headgasket job, just got the heads back from the shop, and i read for rocker arm torque 18-25ft lbs. Is it 18 or 25? Also how do i torque the head bolts? And off hand, does anybody know the bolt thread and size of the exhaust manifold?

 

Of its 18-25 I'd prolly do like 20. There's a specific order for the head bolts. I'd say go get a haynes manual for your truck and that will give you all your torque specs and sequences.

 

Yea I know the order, but read that these bolts are torque to yield and have no clue what that means

 

Head bolts with shouldered hex heads are reusable. Head bolts with washers built on to the bolts are torque to yield and should be replaced. Fel-pro website has torque specs and pattern for both style bolts. Use thread sealer on all bolts that thread through the deck into the water jacket. A dab of assembly lube on the underside of the bolt heads will help you accurately reach proper torque.

 

Just google torque to yield.... There's a great pdf on them ..1rst hit... short version is you can't reuse them. There is a sequence for head bolt torquing and you should follow it verbatim.

Exhaust manifold bolts... don't know,,, get a nut...or keep sticking bolts in there till you get one that screws easy...

 

Torque to yield bolts require the use of a torque wrench and a yield angle gauge. Your local parts store should have one for around $20.

 

I already have the new head bolts, and I'm asking about the manifold bolts because I got a set of long tube headers and need shorter bolts since the flange is only 1/4 thick. I HAVE the originals, but they are about a 30 min drive away

 

Exhaust manifold bolts either 5/16 x 18 or 3/8 x 16

 

Torque to yield bolts stretch as you torque them to maintain clamping strength. Because they stretch you can't reuse them because the torque load will be inaccurate. Other than that they are the same as any other bolt. No real mystery there.