Author Topic: A scratch block  (Read 1081 times)

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Offline redscj

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Re: A scratch block
« Reply #15 on: March 18, 2019, 01:28:03 pm »
     I thought that by 69 the casting number was meaningless.
« Last Edit: March 19, 2019, 02:59:55 pm by redscj »
Grant
69 Mach 1 Dearborn SCJ 4.30 4spd 6/17/69 Candy Apple Red
69 Sportsroof Metuchen SCJ 4.30 C6 5/28/69 Acapulco Blue

Offline sportyworty

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Re: A scratch block
« Reply #16 on: March 18, 2019, 08:40:37 pm »
And the saga continues. Something like the conspiracy theories. Maybe someone will make a movie about A and C scratch blocks and build dates. Yawn...……..

The fact is it's solved and quite simple to follow actually. The timeline is reliable and clearly illustrates the features.

8F91R577646  Black 4 Speed

Offline sportyworty

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Re: A scratch block
« Reply #17 on: March 19, 2019, 03:59:34 pm »
     I thought that by 69 the casting number was meaningless.

The engineering number cast into the cylinder block is not a reliable indicator of original displacement. It was a common mold plate shared with other FE displacement apps. There are exceptions like the C8ME GTE 427 but for our 68-70 CJ cars they were using the C7M engineering number variants on 352/360/390/428 castings and the 428 blocks stop casting the number starting some time in October'ish 1968. Engineering numbers are not part numbers when it comes to application specifically
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Offline specialCJ

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Re: A scratch block
« Reply #18 on: March 24, 2019, 04:52:21 pm »
Wanted to share the answer to the mystery. Got a picture of the cast date on the block in question. It is 6A15 so obviously way too early to be a Cobra Jet block.

Pat
69 Mach 1 428 CJ-R