Re: 327 Manifold Gaskets
Posted by Mike On 2011/4/3 10:38:51
I had this same issue, no exhaust leak but it was fine then loosing power on the freeway then wouldn't idle or barely go unless you pumped the gas.
I chased everything around until i re-tightened the manifolds and now it will idle, but roughly under 800 rpm, but it does run by itself at 450. Idle screws are adjusted pretty far out, but not too far. I'm guessing the same happened to me.
I did notice that when i went to tighten them, they were pretty damn loose, not near what i torqued them at. I did do the correct procedure...i had them apart to sandblast, paint, and new gaskets, tightened to block first. I'm thinking that after i got the car back together, that the heating and cooling of all my tuning and couple test drives caused the manifolds to "settle" and if i had torqued them before it started running rough, maybe it would still be fine. I just tightened them "damn hand tight" in my haste and that got me back to somewhat running. Maybe i'll revisit putting new gaskets on there and checking the manifolds with a straight edge.
One note, between the rear-most gap between the intake and exhaust, i saw my gasket had heaved around the stud. I thought i had found the issue, until i saw my old engine, that ran great, had the same issue. Old motor seemed to have metal gaskets, new were like cardboard with metal in the middle. Both scrunched up in the same spot, but don't seem to affect:
Attach file:
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I chased everything around until i re-tightened the manifolds and now it will idle, but roughly under 800 rpm, but it does run by itself at 450. Idle screws are adjusted pretty far out, but not too far. I'm guessing the same happened to me.
I did notice that when i went to tighten them, they were pretty damn loose, not near what i torqued them at. I did do the correct procedure...i had them apart to sandblast, paint, and new gaskets, tightened to block first. I'm thinking that after i got the car back together, that the heating and cooling of all my tuning and couple test drives caused the manifolds to "settle" and if i had torqued them before it started running rough, maybe it would still be fine. I just tightened them "damn hand tight" in my haste and that got me back to somewhat running. Maybe i'll revisit putting new gaskets on there and checking the manifolds with a straight edge.
One note, between the rear-most gap between the intake and exhaust, i saw my gasket had heaved around the stud. I thought i had found the issue, until i saw my old engine, that ran great, had the same issue. Old motor seemed to have metal gaskets, new were like cardboard with metal in the middle. Both scrunched up in the same spot, but don't seem to affect:
Attach file:
(94.98 KB)
(155.12 KB)
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