NOS Fuel Injection Plenum.....
Le Mans Master
Joined: Feb 1999
Posts: 5,841
Likes: 376
From: Mobile AL
It depends
There were at least three versions of the '63 - '65 FI plenum offered over-the-counter by GM.
The first was a true 1963 plenum for a 7017375 FI unit. It did not have a large threaded hole for a PCV system fitting on the front face. I've never seen one of these offered for sale in NOS condition. My guess is that it would bring about $800 on eBay.
The second was a 7017380 series plenum sold as a '63 "replacement" and a '64 - '65 design. These plenums are die-cast (just like the assembly line plenums) and have a large threaded hole on the front face for the PCV system fitting. I've seen one NOS plenum like this sell on eBay for about $800. I've also seen several of these plenums in as-cast condition with no machining done. The machining would be expensive, so they don't sell for much at all even though they are all "NOS".
The last version offered had a rough sand-cast finish. GM started selling these around 1970. This design is based on the '64 - '65 7380 series plenum but can be used for a '63 unit. They sell in NOS condition for $300 to $400 at swap meets and seem to pop up pretty regularly.
The first was a true 1963 plenum for a 7017375 FI unit. It did not have a large threaded hole for a PCV system fitting on the front face. I've never seen one of these offered for sale in NOS condition. My guess is that it would bring about $800 on eBay.
The second was a 7017380 series plenum sold as a '63 "replacement" and a '64 - '65 design. These plenums are die-cast (just like the assembly line plenums) and have a large threaded hole on the front face for the PCV system fitting. I've seen one NOS plenum like this sell on eBay for about $800. I've also seen several of these plenums in as-cast condition with no machining done. The machining would be expensive, so they don't sell for much at all even though they are all "NOS".
The last version offered had a rough sand-cast finish. GM started selling these around 1970. This design is based on the '64 - '65 7380 series plenum but can be used for a '63 unit. They sell in NOS condition for $300 to $400 at swap meets and seem to pop up pretty regularly.
