Smog Pump to Cat hookup help
Senior User
Joined: Jul 2000
Posts: 101
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From: Maryland/D.C. Area
Well, I can at least tell you the setup on my 84 with a 351, so it is most likely a little diffrent. On mine, a thick rubber hose comes off the pump into a "T" configuration. One part of the "T" goes to a steel air pipe that bolts to the back of each head. The other part of the "T" has the steel pipe clamped to it that runs down to the cat. The "T" itself has what may be a solenoid-type valve on it. This gets hooked up, I think, to a vaccuum source (that's at least what I did with mine when I replaced the engine). So to answer your question, you may need to find out if the 300 had a "blowhole" in the back of the head like a 351. If it doesn't, I don't see why plumbing the pump right up to the cat won't work. Is this to pass emissions or just to "show" that your pollution control junk is in place?
-Tom
-Tom
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Senior User
Joined: Jan 2003
Posts: 327
Likes: 1
Originally posted by hflu
Well, I can at least tell you the setup on my 84 with a 351, so it is most likely a little diffrent. On mine, a thick rubber hose comes off the pump into a "T" configuration. One part of the "T" goes to a steel air pipe that bolts to the back of each head. The other part of the "T" has the steel pipe clamped to it that runs down to the cat. The "T" itself has what may be a solenoid-type valve on it. This gets hooked up, I think, to a vaccuum source (that's at least what I did with mine when I replaced the engine). So to answer your question, you may need to find out if the 300 had a "blowhole" in the back of the head like a 351. If it doesn't, I don't see why plumbing the pump right up to the cat won't work. Is this to pass emissions or just to "show" that your pollution control junk is in place?
-Tom
Well, I can at least tell you the setup on my 84 with a 351, so it is most likely a little diffrent. On mine, a thick rubber hose comes off the pump into a "T" configuration. One part of the "T" goes to a steel air pipe that bolts to the back of each head. The other part of the "T" has the steel pipe clamped to it that runs down to the cat. The "T" itself has what may be a solenoid-type valve on it. This gets hooked up, I think, to a vaccuum source (that's at least what I did with mine when I replaced the engine). So to answer your question, you may need to find out if the 300 had a "blowhole" in the back of the head like a 351. If it doesn't, I don't see why plumbing the pump right up to the cat won't work. Is this to pass emissions or just to "show" that your pollution control junk is in place?
-Tom
