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At what torque must the Intake Manifold Bolts be tightened to on a 98 Chevy 350 Vortex Two years post replacement the manifold seems to be leaking again?
Wiki User
∙ 16y ago
The 98 Vortec 350 CID engine has an aluminum intake and a plastic plenum mounted to it. I just had to tear mine down due to a blown intake manifold gasket on the water port located above #1 Piston. This caused MAJOR leak of Anti-Freeze into the "Valley of lifters" and consequently into my oil.
The Aluminum intake manifold on a 98 Vortec 350 engine should have 8 bolts total, located in the 4 corners of the manifold.
The Torque order is the center bolts in an "X" pattern followed by the outers in a line pattern. Following the cylinder numbers of 1 - 8 (1, 3, 5, 7 on drivers side, and 2, 4, 6, 8 on passenger) you would tighten them down 3, 6, 4, 5 for the "X" pattern, then 7, 8, 2, and finish on 1.
You tighten them down in steps
1st round goes to 26 in lbs.
2nd round to 106 or 116 in lbs.
Then last round is 11 ft lbs
The Haynes manual is correct on that but they do not mention the ft lbs behind 11 on that last step
Hope that helps
;-)
Wiki User
∙ 16y ago
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