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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: May 2014 Posts: 44 Wrench Fetcher | | Wrench Fetcher Joined: May 2014 Posts: 44 | I have a pretty solid 250 six that I would like to swap into a 49 3100. I pulled the exhaust manifold and noticed that there is a tube in each exhaust port that is capped with a brass plug in the head. What are these and can I just remove them?
Thanks for your help!
| | | | | Joined: Feb 2004 Posts: 29,826 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,826 | Those are air injection tubes that the tree huggers who ran the EPA insisted on having for emission control purposes back when that engine was a daily driver. Originally, the engine had an air pump and a rat's nest of tubing connected to those ports. Go ahead and get rid of whatever's sticking into the ports, any way you need to. I'd suggest a Sawzall or something similar.
If the cylinder head happens to have the intake manifold cast integral with it, use that head for a boat anchor and find yourself a pre-smog head with a separate intake to use.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: May 2014 Posts: 44 Wrench Fetcher | | Wrench Fetcher Joined: May 2014 Posts: 44 | The intake and exhuast manifolds are separate. Thanks for the help Jerry!
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