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401 year ?

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htrdkd69 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote htrdkd69 Quote  Post ReplyReply Direct Link To This Post Topic: 401 year ?
    Posted: Jan/11/2018 at 12:13am
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lyle Quote  Post ReplyReply Direct Link To This Post Posted: Jan/11/2018 at 6:19am
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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote htrdkd69 Quote  Post ReplyReply Direct Link To This Post Posted: Jan/11/2018 at 1:43pm
Ok thanks a bunch it looks like its supposed to be 8.25 to1
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SC397 Quote  Post ReplyReply Direct Link To This Post Posted: Jan/11/2018 at 1:56pm
The part number on the heads will tell you what compression ratio it was.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote amxron Quote  Post ReplyReply Direct Link To This Post Posted: Jan/12/2018 at 3:12am
The 1971 high comp 401 had different pistons and heads.

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htrdkd69 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote htrdkd69 Quote  Post ReplyReply Direct Link To This Post Posted: Jan/13/2018 at 3:50am
Hi sorry it took so long the casting numbers for the heads are 3225002-2 there's also 5-13
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Post Options Post Options   Thanks (0) Thanks(0)   Quote purple72Gremlin Quote  Post ReplyReply Direct Link To This Post Posted: Jan/13/2018 at 7:30am
Originally posted by htrdkd69 htrdkd69 wrote:

Hi sorry it took so long the casting numbers for the heads are 3225002-2 there's also 5-13
Sure? The last 3 should say 502. If so, 1974-77.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote htrdkd69 Quote  Post ReplyReply Direct Link To This Post Posted: Jan/13/2018 at 2:23pm
Im sorry one to many zeros it is 502-2 would I be right in thinking its 8.25to 1 ?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote pacerman Quote  Post ReplyReply Direct Link To This Post Posted: Jan/13/2018 at 2:55pm
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote htrdkd69 Quote  Post ReplyReply Direct Link To This Post Posted: Jan/13/2018 at 3:05pm
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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