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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/10/2018 at 11:13pm |
Hi I waa wondering if anyone could help me figure out what year my 401 was made the casting numbers on the back driver side of the block are 3198951the numbers in the valley are b178 and there is just a big 7 there as well thr block also has a big 7 and h on the back as well any ifo would be great im trying to figure out the year built and compression ratio thank you
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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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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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SC397
AMC Addicted Joined: Apr/30/2009 Location: Michigan Status: Offline Points: 5476 |
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The part number on the heads will tell you what compression ratio it was.
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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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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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purple72Gremlin
AMC Addicted Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16611 |
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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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pacerman
Supporter of TheAMCForum Joined: Jul/03/2007 Location: United States Status: Offline Points: 9057 |
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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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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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