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401 year ? |
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htrdkd69
AMC Apprentice Joined: Nov/09/2016 Location: Missouri Status: Offline Points: 97 |
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Posted: Jan/13/2018 at 8:30pm |
I believe you are right about the b being for a mod to the cast a closer look shows that the driver side of the block has been machined for the push rod clearance as the right side is cast
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htrdkd69
AMC Apprentice Joined: Nov/09/2016 Location: Missouri Status: Offline Points: 97 |
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There is a clock depending on how you look at it it reads either 1 o'clock or 7 o clock I read on another fourm that 74 to 77 was all 8.25 to 1 does that sound right ?
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pacerman
Supporter of TheAMCForum Joined: Jul/03/2007 Location: United States Status: Offline Points: 9048 |
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The 178 is probably the Julian date (sequential date of the year) And the 7 probably means 1977. The B in your case might mean second shift or perhaps a light mod to the casting/molding process. There might be a "clock" symbol cast into the valley which also indicates the shift where the mold waste set or casting performed and the hour of that shift. Joe
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Happiness is making something out of nothing.
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htrdkd69
AMC Apprentice Joined: Nov/09/2016 Location: Missouri Status: Offline Points: 97 |
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Im sorry one to many zeros it is 502-2 would I be right in thinking its 8.25to 1 ?
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purple72Gremlin
AMC Addicted Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16591 |
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htrdkd69
AMC Apprentice Joined: Nov/09/2016 Location: Missouri Status: Offline Points: 97 |
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Hi sorry it took so long the casting numbers for the heads are 3225002-2 there's also 5-13
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amxron
AMC Nut Joined: Nov/18/2011 Status: Offline Points: 295 |
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The 1971 high comp 401 had different pistons and heads.
Ron. |
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AMXron
Fleet/Jeep Mgr. Orbit AMC/Jeep 50-1787 |
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SC397
AMC Addicted Joined: Apr/30/2009 Location: Michigan Status: Offline Points: 5428 |
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The part number on the heads will tell you what compression ratio it was.
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htrdkd69
AMC Apprentice Joined: Nov/09/2016 Location: Missouri Status: Offline Points: 97 |
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Ok thanks a bunch it looks like its supposed to be 8.25 to1
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Lyle
AMC Addicted Joined: Jul/17/2014 Location: None Status: Offline Points: 772 |
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I believe the b178 is month- letter, day, year. So Feb 01 1978.
Reference: http://www.planethoustonamx.com/main/amc_engine_casting_numbers.htm Last year of the 401's.
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