273 318 dual quad
#3228375
04/21/24 08:36 AM
04/21/24 08:36 AM
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Joined: Jul 2003
Posts: 4,769
Holland MI Ottawa
2boltmain
OP
master
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OP
master
Joined: Jul 2003
Posts: 4,769
Holland MI Ottawa
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This is on Facebook Book Market place. It's interesting a factory Mopar air cleaner fits on this set up.
Keep old mopars alive.
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Re: 273 318 dual quad
[Re: 2boltmain]
#3228511
04/21/24 10:47 PM
04/21/24 10:47 PM
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Joined: Jan 2003
Posts: 15,350
Omaha Ne
TJP
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 15,350
Omaha Ne
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that is rather interesting  just an FYI the early 273's used a different intake than the 318's
Last edited by TJP; 04/21/24 10:50 PM.
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Re: 273 318 dual quad
[Re: TJP]
#3228518
04/21/24 11:11 PM
04/21/24 11:11 PM
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Joined: Jan 2003
Posts: 10,555
Freeport IL USA
poorboy
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,555
Freeport IL USA
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that is rather interesting just an FYI the early 273's used a different intake than the 318's Yep, I believe drilling the mounting holes a bit larger diameter solved that problem, it seems to me the threaded holes in the 273 and the 318 heads were at a slightly different angles. Opening up the holes on the intake allowed the bolts to be threaded into the heads and the slight difference in the angles didn't cause any sealing issues. But it was a long time ago.
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Re: 273 318 dual quad
[Re: poorboy]
#3228727
04/23/24 10:30 AM
04/23/24 10:30 AM
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Joined: Sep 2003
Posts: 19,395
north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,395
north of coder
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that is rather interesting just an FYI the early 273's used a different intake than the 318's Yep, I believe drilling the mounting holes a bit larger diameter solved that problem, it seems to me the threaded holes in the 273 and the 318 heads were at a slightly different angles. Opening up the holes on the intake allowed the bolts to be threaded into the heads and the slight difference in the angles didn't cause any sealing issues. But it was a long time ago. also, didn't the early 273's use 5/16" bolts as opposed to the 318 using 3/8" bolts ? i may be wrong on this, not that i have been wrong in the past......  if so, will someone please correct me ?
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Re: 273 318 dual quad
[Re: poorboy]
#3229025
04/24/24 09:40 PM
04/24/24 09:40 PM
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Joined: May 2019
Posts: 6,241
nowhere
Sniper
master
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master
Joined: May 2019
Posts: 6,241
nowhere
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Yep, I believe drilling the mounting holes a bit larger diameter solved that problem, it seems to me the threaded holes in the 273 and the 318 heads were at a slightly different angles. Opening up the holes on the intake allowed the bolts to be threaded into the heads and the slight difference in the angles didn't cause any sealing issues. But it was a long time ago.
Exactly right, that's how I put a Performer intake on my 65 273.
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Re: 273 318 dual quad
[Re: Sniper]
#3229092
04/25/24 10:39 AM
04/25/24 10:39 AM
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Joined: Sep 2003
Posts: 19,395
north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,395
north of coder
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Yep, I believe drilling the mounting holes a bit larger diameter solved that problem, it seems to me the threaded holes in the 273 and the 318 heads were at a slightly different angles. Opening up the holes on the intake allowed the bolts to be threaded into the heads and the slight difference in the angles didn't cause any sealing issues. But it was a long time ago.
Exactly right, that's how I put a Performer intake on my 65 273. did the performer intake have the small ports ? what size did you drill the holes to ? did you use washers under the bolt heads ?
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Re: 273 318 dual quad
[Re: moparx]
#3229261
04/26/24 08:03 AM
04/26/24 08:03 AM
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Joined: May 2019
Posts: 6,241
nowhere
Sniper
master
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master
Joined: May 2019
Posts: 6,241
nowhere
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Yep, I believe drilling the mounting holes a bit larger diameter solved that problem, it seems to me the threaded holes in the 273 and the 318 heads were at a slightly different angles. Opening up the holes on the intake allowed the bolts to be threaded into the heads and the slight difference in the angles didn't cause any sealing issues. But it was a long time ago.
Exactly right, that's how I put a Performer intake on my 65 273. did the performer intake have the small ports ? what size did you drill the holes to ? did you use washers under the bolt heads ? I don't recall the port match, I don't worry about it, it's turd polishing for a stock 273 in my opinion, lol. I don't recall the size drill bit I used, wasn't much bigger than the stock opening as someone mentioned the intake bolts are smaller on the early 273 and there was almost enough clearance as it was, just did a test ft and inspection while it was on the stand. I always use washers, so yes, but not so much because of anything specific to this swap.
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