Mystery device mounted to heat shield btw SU's

[RustyBucket]

Glad I have some pictures to be able to put the plumbing back in order. I've not seen another photos or information on this smog arrangement.

- Here is a trick question for you.. Are harden valve seats required for "today's fuels" to keep form trashing the rest of the motor ?
Any experience with that ??
Cam

[keith0alan]

I have had a few heads off an have never seen major issues with the bronze intake valve seats. I would not take an engine apart just to do the valve seats. Do them next time the head needs to come off for other things like valve guides and stuff.

[RustyBucket]

Keith,
Thank you for the information! I was hoping that would be the case

As it is, I have the clutch mc and the brake mc to rebuild/ replaced, lines to flush, wheel cyls to deal with. $$

[david premo]

I think that maybe a Datsun 411 intake manifold for an automatic transmission.

[roadsterdude1600]

My '70 project also has the mystery device. I am planning to de-smog when I put it back together, but I also wondered what it does. Just bolted to the manifold with 2 dangly wires...They had to re-machine the intake manifold to mount that gismo, and only in 1970. I have 6 other intake manifolds without that boss. A lot of trouble for something that looks like a "feel good" smog helper.

[Linda]

I wonder if anyone who has a 70 has gone so far totally stock that they actually keep all that smog system crap....at least for the car show....
Linda

[RustyBucket]

Mike . I have a late ‘69 and a ‘70 SPLs. My intake had the ‘gulp valve’ which ‘prevents backfired’ between gear shifts, I was told.

I sent my intake and SUS to Ztherapy for a rebuilding and every thing return in beautiful condition - except he plugged the smog ports and eradicate the gulp valve.

They are mounted on the engine, but I ve yet to fire the car up due to prior commitments.

Call or email Ztherapy for help maybe

[redroadster]

That last pic shows ...what looks like a anti backfire valve
With high vacuum the engine pulled fuel through enough to cause a bf plus burn it it opened a big vacuum leak until vacuum lessend

[roadsterdude1600]

I am trying to post a picture of an old and "new" (1970) intake manifold side by side to show the new casting with the boss for the anti-backfire device. I am not sure how to post a picture. When I click insert image it does not allow me to navigate to the image. I know I have done this before, but age is catching up...something obvious I am sure.

[RustyBucket]

GULP Valve and the treatment performed by ZTherapy on my nasty intake manifoldand SUs. *Minus the SMOG)

I had to dig around for the before and after photos. Hope these help

IMG_0147.JPG

IMG_0249.JPG

IMG_0305.JPG

IMG_0471.JPG

IMG_0475.JPG

[spl310]

It looks like Z Therapy changed out your manifold to an early manifold. They didn't have smog stuff.

[RustyBucket]

I thought that was rather odd too. I figured that they would have returned the correct manifold. Now I have to strip the air pump and other smog parts off.

Will it run correctly now ??

[spl310]

If you strip the smog stuff off and set the car up like a pre smog car, it will run better. That being said, if you want to retain it, you could push back and tell them that you want the original 1970 manifold.

[RustyBucket]

I think I’ll give the no smog attempt a try since the other smog parts are not in good shape to begin with

[RustyBucket]

I gave to figure which bits to remove and what ports/ hoses need to be plugged - that’s going to be pain