Engine Curiosities - Page 2 - JeepForum.com
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post #16 of 18 Old 10-27-2017, 10:02 PM
Mortgage-payer
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1976 CJ7 
 
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Quote:
Originally Posted by LumpyGrits View Post
The date on the block is the casting date.
Most iron block makers let the blocks sit for a year or so as the iron will age harden during this time.
My '85 I bought new in March of '85, has a late 83 date stamp on the block.
LG
The age hardening process in gray irons takes place in days not months or years.


I call it a distributor, not a dizzy.
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post #17 of 18 Old 10-28-2017, 04:12 AM
whollsee
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Originally Posted by Mortgage-payer View Post
The age hardening process in gray irons takes place in days not months or years.
Don't know SFA about metallurgy but I thought long ageing used to be done anyway regardless of what the science may have said. Almost a foundry tradition? Perhaps AMC just had stockpiles of blocks? Anyway, our engines are cast steel aren't they?

When ever I hear the word 'Jeep' I reach for my wallet.
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post #18 of 18 Old 10-28-2017, 01:00 PM
LumpyGrits
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Cj

Quote:
Originally Posted by Mortgage-payer View Post
The age hardening process in gray irons takes place in days not months or years.
Iron blocks and heads are cast from Ductile iron.
Think the foundry who casts the block would know what the best is.
It was/is SOP to let a Ductile iron block to set for a year or more, before machining starts.
AMC blocks are Ductile iron.
LG

Have'n you along, is like loose'n 2 good men
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1975 cj5 , cj5 , engine , newbie , oil filter

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