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401 cam paint mark |
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xspiriment
AMC Nut Joined: Apr/27/2009 Location: New Mexico Status: Offline Points: 376 |
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Posted: May/02/2021 at 9:35am |
401 cam paint mark (white) .Pulled this cam from a 304 i bought about 3 weeks ago. I have been searching the web for 401 cam specs and id find some help here. I do know the lift is .456 checking with my dial gauge. I tried checking the .050 to .050 duration with a degree wheel and keep coming up with 263 degrees going from .050 over the nose and back to .050. I know this is not the correct duration but does this tell you guys what it might be. I believe is just a stock 401 cam. Found one search mentioned the paint mark for 401 and said to be white mark. This 304 engine also had 502 head on it and yes every valve clearanced itself by hitting the bore edge. If the cam info sound like rubbish i will continue on. thanks Paul
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SC397
AMC Addicted Joined: Apr/30/2009 Location: Michigan Status: Offline Points: 5428 |
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I am not sure about the white paint but the 401 cam has a ring located in between the first two lobes. |
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Sonic Silver
Supporter of TheAMCForum Joined: Nov/23/2011 Location: East Tennessee Status: Offline Points: 7903 |
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IO: -(7) BTDC IC: 34 ATDC EO: 42 BBDC EC: -(14) ABDC Duration: 207/208 degrees Overlap: -(21) degrees The above are all at .050 Lobe center angle 114 degrees Intake centerline 110 degrees Exhaust centerline 118 degrees Lift with 1.6 rockers measured .456
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xspiriment
AMC Nut Joined: Apr/27/2009 Location: New Mexico Status: Offline Points: 376 |
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IO: -(7) BTDC IC: 34 ATDC EO: 42 BBDC EC: -(14) ABDC Duration: 207/208 degrees Overlap: -(21) degrees The above are all at .050 Lobe center angle 114 degrees Intake centerline 110 degrees Exhaust centerline 118 degrees Lift with 1.6 rockers measured .456 This is one of the postings i found while searching. I am going to reset the dial gauge and check again. Was thinking using this in my j4500 jeep with the LS rockers for a little more lift but don't want to much duration. Thanks SC397 and Sonic for the replys
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xspiriment
AMC Nut Joined: Apr/27/2009 Location: New Mexico Status: Offline Points: 376 |
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Oh, and checked for a ring as shown by Sc397, no ring.
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Sonic Silver
Supporter of TheAMCForum Joined: Nov/23/2011 Location: East Tennessee Status: Offline Points: 7903 |
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I bought an NOS 401 cam from an AMC dealer back in the 1970's , and never installed it until a few years ago. Sometime in the 1990's , I sent the cam to Kip Fabre, owner of Cam Motion in Baton Rouge, Louisiana for him to read the specs on his Cam Doctor machine that was invented by Quadrant Scientific. I have the open/close events to a tenth of a degree, and the lift to 4 or 5 decimal points. It seems like the lift was more like .456/.460 rounded off, but I don't have the sheet with me at the moment.
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Sonic Silver
Supporter of TheAMCForum Joined: Nov/23/2011 Location: East Tennessee Status: Offline Points: 7903 |
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I just checked my 401 cam and it has the same ring between the first 2 lobes as the one Rick posted a picture of. Also, it has a casting number of #3198817 on the shaft between lobes. Whether or not that is a casting number for all AMC cams or just for a 401, I don't know.
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xspiriment
AMC Nut Joined: Apr/27/2009 Location: New Mexico Status: Offline Points: 376 |
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Its possible that its an aftermarket cam but i never seen after market cam with paint marks, ever. No shops around here have a cam doctor, that sure would be a certain way of finding out what this is. Thanks again Sonic.
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Sonic Silver
Supporter of TheAMCForum Joined: Nov/23/2011 Location: East Tennessee Status: Offline Points: 7903 |
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xspiriment
AMC Nut Joined: Apr/27/2009 Location: New Mexico Status: Offline Points: 376 |
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Checked the cam good yesterday and had no stampings in it. Next to the paint mark is a cast in core num H1and the CWC a few inches from the back. The back of cam has the lug cut off with a grinder. Not sure who built this 304 but it was not a good combo. Think i pulled off half a tube of silicone sealer from the intake pan and timing cover, had no oil slinger in it. Any way thanks guys for your input. Paul
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