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401 belly pan modification. |
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Firecopemt
AMC Apprentice Joined: May/22/2021 Location: Florida Status: Offline Points: 49 |
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Posted: Jan/25/2022 at 6:45pm |
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Apparently, there is a different way to put a belly pan under the intake manifold on a 401 with an aftermarket Intake. I am using an Offenhauser dual quad aluminum intake, with twin EFI. I'm told you have to "attach" the belly pan somehow, but there is a few different ways I'm being told. Does anyone know what is the best way, where do I get the right belly pan, and how do I "afix" it? Thank you for the help.
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Heywood Jablomi
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mbwicz
Supporter of TheAMCForum Joined: Feb/20/2019 Location: Buffalo, NY Status: Offline Points: 2001 |
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On my 390 with an edelbrock intake, I was able to use the valley pan with no special modifications. The intake has a small baffle under the oil fill tube, I didn't try and install a factory type baffle.
Mike |
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1970 AMX, one step forward, one step back. Both steps cost time and money.
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6916 |
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Good reference:
And you will burn oil if you don't put a full/partial or some sort of deflector there if planning to use the PVC valve. And yes, I have done this a couple of times myself using self tapping machine screws instead of drive pins.
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Midnight Rambler
AMC Addicted Joined: Jan/17/2011 Location: SoCT Status: Offline Points: 1670 |
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I did the same rather than trying to use the "rivnuts". I think Fastenal does carry the originals:
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'66 American 440 Convertible 290/M-40/AMC 20 3.15/PS/PB '04 Jeep Wrangler X Rocky Mountain Edition 4.0 5sp |
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6916 |
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Thanks for correcting me on the name of the fastener. Going off the top of my head vs getting the name correct, no excuse then other things going on in life.
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PROSTOCKTOM
Supporter of TheAMCForum Joined: Jun/20/2010 Location: Indiana Status: Offline Points: 2458 |
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McMaster-Carr has the screws way cheaper than dealing with Fastenal. https://www.mcmaster.com/u-drive-screws/
Tom
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Molnar Technologies Full Service Dealer - Crankshafts & Connecting Rods
1969 AMC Rambler Rouge Race Car 1974 AMC Hornet Hatchback, Wally Booth Outlaw Nostalgic Pro Stock Race Car Project |
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BassBoat
AMC Addicted Joined: Aug/29/2008 Status: Offline Points: 1719 |
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In the link Trader posted, Phat69 posted pics of early vs late pans. My dual quad intake didn't match the pan I had laying around, but looking at the early picture, pretty sure that is what lines up for your intake. Maybe someone will chime in as to what year the change was, maybe when the intake was changed between 69 and 70 but I don't really know for sure.
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1948kaiser
AMC Addicted Joined: Jan/25/2015 Location: south west flor Status: Offline Points: 839 |
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what i have found is a 3 slot pan is pre recurcilation valve and the 4 slot is for one with the valve. cannot spell it right. the pans are different shapes on the bottoms and will not interchange each other.
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Firecopemt
AMC Apprentice Joined: May/22/2021 Location: Florida Status: Offline Points: 49 |
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The castings #s displayed show that my block was manurfactured in December of 1972.
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Heywood Jablomi
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PROSTOCKTOM
Supporter of TheAMCForum Joined: Jun/20/2010 Location: Indiana Status: Offline Points: 2458 |
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Tom
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Molnar Technologies Full Service Dealer - Crankshafts & Connecting Rods
1969 AMC Rambler Rouge Race Car 1974 AMC Hornet Hatchback, Wally Booth Outlaw Nostalgic Pro Stock Race Car Project |
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