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#1
02-21-2007, 03:06 AM
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Re: Block Casting Numbers
New info on block! Talked to someone who refreshed my memory on this block.
In the late 60s and early 70s the NHRA required you to run the same year block as the car in SS and stock. When these camaros were new the blocks were not that easy to find. This blocks numbers were changed to fit the class they were running at the time. The numbers on the block now are 3969854. I know the 9 and the 6 has been changed. The three i an not sure about. The casting num on the side of the block below the freeze plug is J 10 8 It has a screw on oil filter. Also has the extra plug at the oil filter for external oiling. I still would like to know what this block was born in. Thanks for your input.
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69z2x4s 69vette 
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#4
02-21-2007, 04:45 AM
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Re: Block Casting Numbers
No I don't think that 454 would have a tall boss. It is not a tall truck block by any chance. Not all of them had truck stamped. They were 3969852 for the 366 and 3969858 for the 427 from 68-85. cannot see it if you raced it but just to eliminate another possibility. Easiest way to tell is how much material is there between the top of the water pump bolt hole and the top of the deck. Truck block cannot be missed when you look there.
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#5
02-22-2007, 05:47 AM
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Re: Block Casting Numbers
The 3969854 block was a 402. GM would not use the same
casting number on different c.i. displacements. The J-10-8 however is way too early for an '854 block as they came into production late in summer of 1969. Check that casting date again. Steve
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#6
02-22-2007, 05:59 AM
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Re: Block Casting Numbers
Chevelle boys and other lists state differently Steve. 854 was also a 454.
 http://www.chevellepages.com/numbers...ng_Numbers.htm http://nastyz28.com/sbchevy/bbparts1.html
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#7
02-23-2007, 06:17 AM
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Re: Block Casting Numbers
Joe,
I followed the link - but I don't believe it. I've never seen an '854 used in a 454 application. Colvins books don't even mention the '854 as a 454 and most consider these the bible. I'll look into it some more and get back to you. Got my curiousity peaked Steve
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