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Mod | | | Forums66 Topics128,030 Posts1,055,428 Members48,422 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Oct 2010 Posts: 171 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2010 Posts: 171 | Have the engine just about wraped up but can not figure out what the heck this 3 port brass fitting is for(where the lines go. it's an '84 chevy 4.1L 250 port
....David
| | | | | Joined: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | Hy 54barnfind, is that fitting in the intake manifold, or in the water jacket in the head? | | | | | Joined: Oct 2010 Posts: 171 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2010 Posts: 171 | it's on the head....don't think it's in the h20 jacket but could be wrong. the orange 2-port sensor below it is in the water jacket though
....David
| | | | | Joined: Nov 2006 Posts: 2,544 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 2,544 | | | | | | Joined: Oct 2010 Posts: 171 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2010 Posts: 171 | could be, as two of the ports are small going out the sides. But what would the large 5/16 vertical line go to??
Thanks for the help!
....David
| | | | | Joined: Oct 2007 Posts: 725 Shop Shark | | Shop Shark Joined: Oct 2007 Posts: 725 | Hi 54barnfind, I'm pretty sure that is part of the pollution control control system that went to/fed an air control valve. You are right at the end of 250 production. Does your engine have the 2bbl intake and dual exhaust, and the valve cover with the two humps? Find a Chilton's or Glenn's manual and look in emission controls. Because you have the "one piece" head, that thing probably goes right into the intake! When I put a replacement engine in my '75 C10 it was a late "pollution" engine with all the stuff. Because it wasn't required, I pulled it all and replaced the carb with a Webber 2bbl, and plugged all the extra holes. It made a runnin' 6.
best wishes,
Les | | |
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