2f intake manifold: how bad is too bad? (3 Viewers)

[johnnyshaner]

I'm doing the 3fe exhaust mod and I'm not sure my existing intake manifold is going to work out. It's not cracked, but you can see the eroded aluminum. Is this okay? I'm not looking for a ported intake, but will this be a future problem?

As I guessed it's not completely flat. It's off by 0.020.

 

[OSS]

It doesn’t matter how yucky the inside looks, so long as there isn’t a crack (usually found directly under the carburetor).
All 2F intake manifolds are warped by now if they’ve never been machined flat at some point.
Personally- I wouldn’t mess around. You’ve got the manifold off — machine that sucker flat! You’ll be glad you did.

 

[Spike Strip]

That 'erosion' looks more like a casting artifact - Either way it's not an issue. As for the flatness, look in the FSM to see what the tolerance is.

 

[Godwin]

When you mount up the intake and exhaust use a Reflex gasket. I did this mod 7 years and ca. 150,000 miles ago and my setup remains leak free.

 

[johnnyshaner]

When you mount up the intake and exhaust use a Reflex gasket. I did this mod 7 years and ca. 150,000 miles ago and my setup remains leak free.

Cool, thanks. I notice that there's some additional bolt/stud reliefs on the 3fe exhaust manifolds that the 2f exhaust manifold doesn't have. I guess the extra studs/bolts aren't necessary when mounting these to the 2f?

 

[Godwin]

Cool, thanks. I notice that there's some additional bolt/stud reliefs on the 3fe exhaust manifolds that the 2f exhaust manifold doesn't have. I guess the extra studs/bolts aren't necessary when mounting these to the 2f?

Yes, just use the 2F studs and bolts.

 

[Spike Strip]

*** Reflex should be Remflex if you're unfamiliar.

Amazon product ASIN B00B2HMHQU

 

[johnnyshaner]

Finally finished everything up. Local muffler shop welded up a y-pipe to connect the 3fe manifolds to my current exhaust. Turned out great!