1979 Trans am 400 4-Speed EFE (Heat Riser Valve)
 

Have been searching for a NOS or good condition EFE for a ‘79 W72 400 4-speed. Interestingly, this EFE is different than the ones on the auto trans cars - the 4-speed EFE is the mirror image with respect to the vacuum switch canister.

Kindly advise if you have one to part with or have a possible lead. Thanks so much.

Sorry I don't have one, but can you tell me if the vacuum line to the EFE goes from steel to rubber across the back of the engine? I am helping restore a '79 TA 4 sp and I'm at the point of hooking up all the lines and valves.

Joe Hand

Hi Joe.

Yes, above the EFE there is a small maybe one or two inch length of heat resistant rubber tubing (reddish/orange in color) which then connects to the stainless metal tube.

The stainless tube is held in place with a u-shaped clip, attached to the head bolt, second from the left rear.

Vacuum tubing is then attached to the stainless tube and goes around the back of the engine to the vacuum switch, which is found attached to the right head, about a third of the way forward from the rear of the engine.

I believe three total vacuum lines go to the switch. See the vacuum line diagram - same as depicted on the decal on the top of the core support.

Hope this helps.

Yes, it does help, thank you very much. I doubt I can find one, but I can make one that will work till one comes along.

Joe H

Yes, you can generally clean up the old EFE ‘til a better one comes along. FYI - attached is a pic showing the difference between a NOS EFE for an auto transmission car and the mirror image for a 4-speed car (this one well used and sans the interior valve). These 4-speed units are rare and so if one comes across in good shape or NOS, make the purchase, as likely will not see one again soon.

Also, FYI - the metal piping from the EFE is now made as a reproduction as is very close to the original.

These photo's are from Jim's ( car owner I am working with ) Macho TA #202, the turbo charged edition. It had an automatic EFE that came with the car, no idea if original or not, we used it not knowing there was a difference. It cleared all the four speed linkage, so why the difference? I bent the tube out of brake line, not knowing what they looked like, but it all worked. He brought over the manifolds and valve today, and sure enough its for an automatic and the manifold has a crack in it!

Auto version, but going cheap, so far...

https://www.ebay.com/itm/39462900596...Bk9SR8qcyt6JYg