mopowers
Well-Known Member
Can you identify a thick main 230 400 block by the casting date? Which date range indicates the desirable thick main version? Thanks
I would like to know to !Can you identify a thick main 230 400 block by the casting date? Which date range indicates the desirable thick main version? Thanks
Yes there is a cutoff date. It is pretty early in the production cycle. Check the 440Source website to see if they have the date on there. I think it is late summer time.
not sure the cut off,but my 400 block was cast 12/6/71 and is said not to be one.Can you identify a thick main 230 400 block by the casting date? Which date range indicates the desirable thick main version? Thanks
Looking at my main webbing, it looks thick and very beefy. i often wondered if chrysler made some til the end of the yr and didnt document. Mine had bad core shift and had to fill within 3" from the deck. I have a 530 block as a spare. I think the later blocks are the way to go because of the thicker bore/less core shift.from july to sept,i have 3 230 blocks,one is 12-7-71 not thick web,also beware of frost cracks between freeze plugs as I have 2 that is cracked,one block I paid high bucks for,everyone thinks,these are the #1 race block for low decks,but for many years racers has been using the 630 blocks which have thicker bores,if your building a race motor,go with a later block,same goes with the 440
Thank you that's the date...couldn't remember exactly.10/10/71
Just bought a 230 block. Where is the casting date? Is that cast into the block on the passenger side? I'll need to check mine.
Yea, was looking at that. Is there anywhere else it would be stamped ? Or I can pull the oil pan I suppose.The date is cast on the left side of your picture. looks like '71, but the month is not visible.
Yea, was looking at that. Is there anywhere else it would be stamped ? Or I can pull the oil pan I suppose.
Ok, looks like I have the good one! 9 3 71. Anout 5 weeks BEFORE the cut off date of 10 10 71View attachment 1715267752
Ok, looks like I have the good one! 9 3 71. Anout 5 weeks BEFORE the cut off date of 10 10 71View attachment 1715267752
Looks like i just missed it. Its still a very strong block with thin cylinder walls, but filled for just in case.About the same time mine was cast.