Hey all, I am putting a 71 340 in my 67 barracuda that had a 273. I am trying to use as much of my 273 parts as I can. I was going to use my 273 radiator, alt. water pump and pulleys. I have a Eddie RPM manifold and I noticed it has a 1" By-pass connection that goes to the water pump which on my 273 water pump(cast iron) is smaller like a 3/8 or 5/8 fitting. Can I just buy a reducer or bushing from a hardware store and just reduce the fitting to the proper size on the manifold or any other suggestions. My other option would be to go to the original 340 alumn. water pump, but then I need to switch pulleys and Radiator since the outlet on 70 and up small block are on the passenger side. There is some gain here for the new radiator would be a 3 core,it is what should be on the motor, but of course more cost and a waste of my 273 parts. There may also be a fan to radiator clearence problem do to the 340 pulleys come out a little farther from the motor,but I am just guessing. Thanks for any info!

Anyone?

Just get a flush or face reducing bushing for the intake, that whole pulley change out will cost you bucks.

I would also recommend getting a pipe tap and opening the hole a bit allowing your bushing to sit in further. I did this with all tapped holes on my Performer intake. In my case it was nothing more than for looks. I hate seeing a bunch of threads on a fitting, but in your case it could make it difficult to get the hose on if its sticking out further than it should.

I just took my time on each. Cut half a turn or so, and fit the part, etc, etc...