Torque foot pounds for intake manifold on a 65 corvette 327/365hp

[John S.]

I would like to know the torque foot pounds for an intake manifold for a 65 corvette 327 cu in /365hp engine. Please help!

[David S.]

Re: Torque foot pounds for intake manifold on a 65 corvette 327/365hp

My torque spec sheet shows 30ft/lbs.

Best,
Dave

[Larry M.]

Re: Torque foot pounds for intake manifold on a 65 corvette 327/365hp

My torque spec sheet shows 30ft/lbs.

Best,
Dave

I agree. That is what is shown in the Chevrolet Service Manual. I believe that a few of the bolt holes are "thru holes" and require some sealant on the threads to prevent future leakage.

Larry

[Domenic T.]

Re: Torque foot pounds for intake manifold on a 65 corvette 327/365hp

Larry has a good point about the thru holes and only 4 are not thru, the 2 on each end.

When I was turning a wrench at a Chevy dealer we had to send the job out the door and snuck in 5 lbs more, 35lbs, because we would not be able to retorque the thich gasket. They all loosen up a little after the engine warmed up a few times.

Nice thing is that we can retorque ours and if you use a sealer that dries completely it can break the seal when you turn the bolt to re torque, so a non hardening sealer is best.

And we all know that the center bolts are not easy to retorque so you may need to train your wrist and match the torque you used on the others.
I used to use the long box end wrench and test a bolt that I torqued a few lbs under torque, then move it a bit more to get the feel of how tight the hard to reach bolts needed to be.

DOM

[Larry M.]

Re: Torque foot pounds for intake manifold on a 65 corvette 327/365hp

Larry has a good point about the thru holes and only 4 are not thru, the 2 on each end.

When I was turning a wrench at a Chevy dealer we had to send the job out the door and snuck in 5 lbs more, 35lbs, because we would not be able to retorque the thich gasket. They all loosen up a little after the engine warmed up a few times.

Nice thing is that we can retorque ours and if you use a sealer that dries completely it can break the seal when you turn the bolt to re torque, so a non hardening sealer is best.

And we all know that the center bolts are not easy to retorque so you may need to train your wrist and match the torque you used on the others.
I used to use the long box end wrench and test a bolt that I torqued a few lbs under torque, then move it a bit more to get the feel of how tight the hard to reach bolts needed to be.

DOM

I made up an adapter/extension for my torque wrench for these bolts. It requires a bit less torque setting on the wrench to get the same torque on the bolt. I have also used a long box end wrench and "calibrated wrist". Both work.

Larry

[James W.]

Re: Torque foot pounds for intake manifold on a 65 corvette 327/365hp

I know this is an old thread, but I have some questions. I have to remove all the intake manifold bolts in order to remove the washers that were put on when my dad replaced the intake manifold gaskets back in the mid 1980's. This in on is a 1965 L79 327/350 engine with the aluminum intake.

So what would be the best way to do this? Remove one bolt at a time starting in the center bolt on each side of the manifold or remove them all at once and then re-torqueing the center bolt on each side of the intake manifold and work my way out in a star or cylindrical pattern? Next, do I go straight to the 30 ft./lb. torque specification or do should I go in steps 20, 25 then 30?

Thanks,

James West

[Don H.]

Re: Torque foot pounds for intake manifold on a 65 corvette 327/365hp

James, I would reconsider removing them as the aluminum "is not getting any younger" and will damage with torque. I use AN washers on all my aluminum pieces (intake, plenum, etc) to avoid further damage. The AN washers are much smaller outer diameter and less noticeable. I would think any points deduction if judged would be very minimal. Sorry I didn't answer your question. Don H.

[Larry M.]

Re: Torque foot pounds for intake manifold on a 65 corvette 327/365hp

Remove one and then re-install it. Torque to 30 ft-lbs. Some will require sealer to keep from wicking up oil.

Then do the second one. Repeat as needed.

Doesn't really matter regarding orientation if done like this. Personally I would just leave them alone unless I had to remove the intake.

Larry

[Michael G.]