Torque specs head bolts to the upper intake manifold?

2005 PONTIAC GRAND PRIX

320,000 MILES • 3.8L • V6 • 2WD • AUTOMATIC

SCOTTSOSA_18

MEMBER
1 POST
FOLLOW

I had a blown head gasket and replaced everything but before I put everything back togeather again I need to know the exact torque specs each set of bolts starting from the head bolts to the upper intake manifold. I keep getting different specs from 22 ft/lbs to 37 ft lbs.

Dec 15, 2025 at 6:31 PM

STRAILER

CERTIFIED EXPERT
53,854 POSTS

Hello,

The cylinder head bolts are torque-to-yield so you will need a new set.

First Pass .................... 50 Nm (37 ft. lbs.)
Final Pass .................... 120 degrees

The intake are:

Tighten the lower intake manifold bolts in sequence
L26 to .................... 15 Nm (11 ft. lbs.).

Check out the images (below). Let us know if you need anything else.

Images (Click to enlarge)

Dec 16, 2025 at 10:28 AM