COPO 3963512 block. No VIN#

steakandracingfuel · #1 01-21-2010, 09:16 AM

hey guys i am new here. and i have a problem that could be a bonus for someone. i stumbled across one of my 427's and discovered it is a 3963512 block, i looked for a VIN but did not find one. i saw in an older post that this might be a dealer replacement. my question is: what would this be worth? and would anyone be interested in buying it? i dragrace and would like to see this got to some use and not end up destroyed. my namis is Chris and my email is
[email protected]

contact me there as i may not be on here much. thanks.

steakandracingfuel · #2 01-21-2010, 09:37 AM

update. went out in the garage and had a bit of a brain fart. the number i found stamped on it it

T0908CGV

**Zach Carter** · #3 01-21-2010, 04:07 PM

CGV 1970 Chevrolet 454 345 Mt LS-4

**PeteLeathersac** · #4 01-21-2010, 04:09 PM

Nasty listing notes CGV as '70 Chevrolet LS-4 454/345 w/ a stick..

~ Pete

steakandracingfuel · #5 01-21-2010, 04:19 PM

are you guys sure. 4.250 is the bore it is .060 over and it is a 3963512 block. hard for me to believe this is a 454 when the bore, casting # and crank are all 427

steakandracingfuel · #6 01-21-2010, 04:28 PM

and it has a H319 cast date. so how can it be a 70 454 when the cast date implies it is a 69 block and again i point out it is a 512 block

**PeteLeathersac** · #7 01-21-2010, 04:44 PM

512 was used in '69 & '70 model year cars...cast in '69 & used in a '70 car...same 4.25 bore, someone's added the 427 crank later..

~ Pete

**Tracker1** · #8 01-21-2010, 04:46 PM

Chris,

Your block was cast the last day of August 1969 - that means it was prepped for a 1970 model year car. It's assembly date is September 8th (0908) - again 1969. 512 blocks were not just used for 427s. My LS6 454 and LS5 454 both have 512 blocks cast in late 1969.

I can assure you that the gentlemen who have responded to your query in the above posts are "sure". They are some of the many knowledgeable people you will find on this site. Take their opinion to the bank - and enjoy your 454.

steakandracingfuel · #9 01-21-2010, 04:47 PM

ok ok. i see. but why does the cast# point to 427 and not list 454

**Tracker1** · #10 01-21-2010, 04:53 PM

you must be referencing some incomplete materials/books/documents as 512 casting 454s are quite common.