Big Block chevrolet casting number 3963512 - Chevelle Tech
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post #1 of 13 (permalink) Old Mar 1st, 13, 4:26 PM Thread Starter
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Big Block chevrolet casting number 3963512

I took this engine in on a trade and runs great , forged crank ,H/b rods and srp pistons 30 over . what I planed on doing with it was running a 200 shot of nos on it and while getting the engine set up for it my friend , while wiring the nos up asked what block I have . I gave him the casting number and he told me that was a rare block . my questons , is this a rare block or just a run of the mill 4 bolt block . casting number 3963512 and on the passenger side B 24 70 . thanks for any information .

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post #2 of 13 (permalink) Old Mar 1st, 13, 4:37 PM
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Re: Big Block chevrolet casting number 3963512

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Originally Posted by fowl69 View Post
I took this engine in on a trade and runs great , forged crank ,H/b rods and srp pistons 30 over . what I planed on doing with it was running a 200 shot of nos on it and while getting the engine set up for it my friend , while wiring the nos up asked what block I have . I gave him the casting number and he told me that was a rare block . my questons , is this a rare block or just a run of the mill 4 bolt block . casting number 3963512 and on the passenger side B 24 70 . thanks for any information .
These number can make that block very valuable. Is it stamped on the front pad? That ID code will let you know the value. To a guy restoring a '70 LS-5/6 it's probably worth some coin.

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post #3 of 13 (permalink) Old Mar 1st, 13, 5:16 PM
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Re: Big Block chevrolet casting number 3963512

That's a nice rare block you have there. Can you post the the # s off the engine pad.That is actually the right dated block for my car!

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post #4 of 13 (permalink) Old Mar 1st, 13, 5:47 PM Thread Starter
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Re: Big Block chevrolet casting number 3963512

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Originally Posted by STEVESREDSS View Post
That's a nice rare block you have there. Can you post the the # s off the engine pad.That is actually the right dated block for my car!
there are no numbers on the front pad . The engine was sqr decked .

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Last edited by fowl69; Mar 1st, 13 at 5:48 PM. Reason: cause
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post #5 of 13 (permalink) Old Mar 1st, 13, 6:40 PM
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Re: Big Block chevrolet casting number 3963512

If it is a real 512 "4 bolt" block, without any sleeves or previous problems, It would be worth from $2500 up. That is a good casting date (Feb 24th, 1970) because a lot of guys have cars made after that date that it would work well with. Also, it needs to have the large aux. oil hole above the filter. Make sure its not a LS-5 2-bolt block that has 4-bolt caps added to. Main caps should have the 964 casting numbers on them.
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post #6 of 13 (permalink) Old Mar 1st, 13, 9:21 PM
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Re: Big Block chevrolet casting number 3963512

date of casting and casting number

lots of these made so RARE is not quite correct.
DESIRABLE is a better term
so is PROFITABLE!

find another block, sell this one! Some Corvette guy or LS-6 Chevelle guy will pay you considerable coin to complete the newest matching number car discovered in some midwest barn

George Kettler
o SOLD 8/2016 my beloved 1970 Elky 496.
o 68 Vette 427/M-20/3.36 23 year owner

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post #7 of 13 (permalink) Old Mar 1st, 13, 9:36 PM
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Re: Big Block chevrolet casting number 3963512

I'm sorry but why do so many folks insist that '512 blocks are rare? They were produced by the thousands from 1968 through at least 1971. Rare because of a particular stamping - maybe. How many of the 822 COPO 9561 Camaros and 99 COPO 9562 Chevelles (I think those numbers are good) still have the original engine or how many 1969 L88 Corvettes of the original 116 produced have their original block?

I think the main reason they are considered rare is because every ebay seller that has one for sale says they are. They must be rare, it's the only one they have.

Yes, they are desireable!

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Last edited by David Bates; Mar 1st, 13 at 9:38 PM. Reason: update
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post #8 of 13 (permalink) Old Mar 1st, 13, 9:54 PM
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Re: Big Block chevrolet casting number 3963512

later 1969 production and 1970, not 1968 at all.
Late 1968-mid 1969 are 5439 blocks

George Kettler
o SOLD 8/2016 my beloved 1970 Elky 496.
o 68 Vette 427/M-20/3.36 23 year owner

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post #9 of 13 (permalink) Old Mar 1st, 13, 9:59 PM Thread Starter
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Re: Big Block chevrolet casting number 3963512

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Originally Posted by David Bates View Post
I'm sorry but why do so many folks insist that '512 blocks are rare? They were produced by the thousands from 1968 through at least 1971. Rare because of a particular stamping - maybe. How many of the 822 COPO 9561 Camaros and 99 COPO 9562 Chevelles (I think those numbers are good) still have the original engine or how many 1969 L88 Corvettes of the original 116 produced have their original block?

I think the main reason they are considered rare is because every ebay seller that has one for sale says they are. They must be rare, it's the only one they have.

Yes, they are desireable!
I have no idea if they are rare or not , I just did not want to use a block that should go in a ls6 70 chevelle. if thats not the case then I wont worry about it .

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post #10 of 13 (permalink) Old Mar 1st, 13, 11:21 PM
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Re: Big Block chevrolet casting number 3963512

My 498 is a 512 block. Made in 1970. It was a 2 bolt. Splayed Milodon 4 bolt caps now.
I remember paying $125 for it back in 1990.

Ron

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post #11 of 13 (permalink) Old Mar 1st, 13, 11:31 PM
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Re: Big Block chevrolet casting number 3963512

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I have no idea if they are rare or not , I just did not want to use a block that should go in a ls6 70 chevelle. if thats not the case then I wont worry about it .
stop thnkin bout were it belongs,use the block......

512s rare???? not so much,but more than others...

512s are one of the more desirable chevrolet blocks for sure....

I did read a good point above,sell it to a corvette guy,you could buy a world block for the cash they will pay...
67rat


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post #12 of 13 (permalink) Old Mar 1st, 13, 11:45 PM
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Re: Big Block chevrolet casting number 3963512

Well, the 512 block is good for 2 tenths easy........

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post #13 of 13 (permalink) Old Mar 2nd, 13, 12:11 AM Thread Starter
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Re: Big Block chevrolet casting number 3963512

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Well, the 512 block is good for 2 tenths easy........
im sure it is ,lol

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