401 belly pan modification.
Printed From: TheAMCForum.com
Category: The Garage
Forum Name: AMC V8 Engine Repair and Modifications
Forum Description: AMC-made V8 engine mechanical, ignition and fuel from basic repair to high-perf modifications
URL: https://theamcforum.com/forum/forum_posts.asp?TID=114140
Printed Date: Apr/16/2024 at 10:43am
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Topic: 401 belly pan modification.
Posted By: Firecopemt
Subject: 401 belly pan modification.
Date 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. ------------- Heywood Jablomi |
Replies:
Posted By: mbwicz
Date Posted: Jan/26/2022 at 11:58am
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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 ------------- 1970 AMX, one step forward, one step back. Both steps cost time and money. |
Posted By: Trader
Date Posted: Jan/26/2022 at 12:15pm
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Good reference: https://theamcforum.com/forum/amc-360-intake-manifold-question_topic93741.html" rel="nofollow - https://theamcforum.com/forum/amc-360-intake-manifold-question_topic93741.html 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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Posted By: Midnight Rambler
Date Posted: Jan/26/2022 at 2:26pm
I did the same rather than trying to use the "rivnuts". I think Fastenal does carry the originals:
-------------  '66 American 440 Convertible 290/M-40/AMC 20 3.15/PS/PB '04 Jeep Wrangler X Rocky Mountain Edition 4.0 5sp |
Trader wrote:
Posted By: Trader
Date Posted: Jan/26/2022 at 5:09pm
| 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. |
Posted By: PROSTOCKTOM
Date Posted: Jan/26/2022 at 5:24pm
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McMaster-Carr has the screws way cheaper than dealing with Fastenal. https://www.mcmaster.com/u-drive-screws/" rel="nofollow - https://www.mcmaster.com/u-drive-screws/ Tom
------------- 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 |
Posted By: BassBoat
Date Posted: Jan/28/2022 at 5:31pm
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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. |
Posted By: 1948kaiser
Date Posted: Jan/28/2022 at 5:38pm
| 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. |
Posted By: Firecopemt
Date Posted: Jan/28/2022 at 5:45pm
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The castings #s displayed show that my block was manurfactured in December of 1972. ------------- Heywood Jablomi |
Posted By: PROSTOCKTOM
Date Posted: Jan/28/2022 at 6:40pm
Tom ------------- 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 |