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post #1 of 5 (permalink) Old 01-15-13, 07:58 AM Thread Starter
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428 with X

428 block date code 5j14 has 428 cast in rear water jacket floor but has a perfect X scrached in back of block ? any ideas

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post #2 of 5 (permalink) Old 01-15-13, 05:35 PM
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Re: 428 with X

Near as I can figure is the "X" in the casting made it a service block. Basically, it didn't originate in a car, but sold or used as replacement. Don't take it as gospel, that's just the most common explanation I can find.

Ever notice that there's so many high performance parts available for GM products?

Did you ever think that maybe they NEED them?
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post #3 of 5 (permalink) Old 01-16-13, 04:09 AM Thread Starter
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Re: 428 with X

Thank's, I believe your right.
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post #4 of 5 (permalink) Old 01-17-13, 04:36 AM
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Re: 428 with X

I don't think that's a service block and here's why....... 66 was the first year for the 428. The date code on your block is 5J14 which is 65-Sept-14th. As 66 production started in July-Aug 65 I'd say it's a pretty early 428 block.
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post #5 of 5 (permalink) Old 08-05-15, 09:59 AM
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Re: 428 with X

I too believe that it's a service block.
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