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Old 05-02-06, 11:41PM   #1
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Default 2 block molds for 1970 455's?

This 455 has different numbers and the front timing cover area is larger and flat like the 428, there must have been 2 different casting molds? This one is dated Aug 69, I had another dec 69 and its the newer style.
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Old 05-03-06, 04:35PM   #2
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nobody.....?? I guess I dont understand why they would make a casting mold then change it
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Old 05-03-06, 08:36PM   #3
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I have worked in a few production plants in the Detroit area, never an engine foundry. with that said, I would think there were probably dozens of casting molds. To meet production numbers, say at least 10,000 there is no way 1 mold forming casting cores could make that many blocks even working 24/7 just my .02:ax
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Old 05-15-06, 08:36PM   #4
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I agree
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Old 10-16-07, 07:28PM   #5
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Some 70 455's are more similar to the 428's as you mentioned and others are different.

I have a 70 455 YH and it does not have the 455 displacement cast on the driver side of the block near the front. My block has 455 under the motor mount area like a 428 does.

I don't know when changes were made.

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