What motor is this 327 or 350

[XXXGoldL34M20]

Picked up a motor on Monday, Has a Virgin Bore.
Casting is hard to read but block has a stamp of CEA135856 Casting date of B41 and a O2 71 V shows on the under side of the Starter mount.
The guy I bought it from told me it sat in his garage for 29 years and it is a 327 warranty motor for a 65 Corvette.
Any info much appreciated.

[Kurt S]

It could have been either.
But it probably wasn't a warranty block for a 65 Vette - it was out of warranty by 71.

[XXXGoldL34M20]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Kurt S</div><div class="ubbcode-body">It could have been either.
But it probably wasn't a warranty block for a 65 Vette - it was out of warranty by 71. </div></div>

I have a 327 Cam-Lifters-Pistons, Are they any different in size then a 350?

[John Brown]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: XXXBlackLs6M22</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Kurt S</div><div class="ubbcode-body">It could have been either.
But it probably wasn't a warranty block for a 65 Vette - it was out of warranty by 71. </div></div>

I have a 327 Cam-Lifters-Pistons, Are they any different in size then a 350?
</div></div>

Diameter of the pistons is the same, but the location of the wrist pin is different on a 350 than it is on a 327. 350 pistons will be down the hole if used with a 327 crank and 327 pistons will come out of the top of the block when used with a 350 crank. Cam and lifters will interchange.

[PxTx]

I have some experience with the 3959512, which this appears to be. You can see some more info in this thread and the links within there.

https://www.yenko.net/ubbthreads/ubbt...day-2-dyno-day

Though it has the road draft holes, it should be a medium journal crank (typical 350 size- bigger than small journal 327 but smaller than the 400 sbc mains).

I think this block showed up in 1968 and wax mostly used in CE applications.

[XXXGoldL34M20]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: pxtx</div><div class="ubbcode-body">I have some experience with the 3959512, which this appears to be. You can see some more info in this thread and the links within there.

https://www.yenko.net/ubbthreads/ubbt...day-2-dyno-day

Though it has the road draft holes, it should be a medium journal crank (typical 350 size- bigger than small journal 327 but smaller than the 400 sbc mains).

I think this block showed up in 1968 and wax mostly used in CE applications. </div></div>

Thanks Paul [img]<<GRAEMLIN_URL>>/biggthumpup.gif[/img], The guy I bought it from did tell me it was a 327 he got from warranty for his 66 Corvette so it all makes sense. I also got a ton of 327 parts along with the motor but I just wanted to confirm everything.
Thank You Guys and sYc

[XXXGoldL34M20]

I read up on this Warranty 3959512 block and it seems to be a 302/327/350 replacement block depending on what size crank you use. Seems to be a great Small block motor. I am glad I picked it up.

From Camaros.Org

&quot;The 3959512 casting was mainly used for warranty / service blocks, though it did have very limited production usage in 69 engines. It is a 4&quot; bore block, thus could have 302, 327, or 350 applications&quot;

[Kurt S]

From http://www.camaros.org/drivetrain.shtml#BlockCast - The 3959512 SB casting (not to be confused with the 3963512 427 casting) was mainly used for warranty / service blocks, though it did have very limited production usage in 69 engines. It is a 4&quot; bore block, thus could have 302, 327, or 350 applications.

Yup, the block is the same, but the pistons and crank are unique per displacement.
Could be a 66 warranty block, but doubtful on the 65 unless he just bought it as a service part.

[XXXGoldL34M20]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Kurt S</div><div class="ubbcode-body">From http://www.camaros.org/drivetrain.shtml#BlockCast - The 3959512 SB casting (not to be confused with the 3963512 427 casting) was mainly used for warranty / service blocks, though it did have very limited production usage in 69 engines. It is a 4&quot; bore block, thus could have 302, 327, or 350 applications.

Yup, the block is the same, but the pistons and crank are unique per displacement.
Could be a 66 warranty block, but doubtful on the 65 unless he just bought it as a service part. </div></div>

Yes I made a mistake on my original post when I said 1965 as he has a 1966 Corvette. I am a Chevelle Guy that does not know much about Corvette's LOL, Thanks Kurt [img]<<GRAEMLIN_URL>>/biggthumpup.gif[/img]

[PxTx]

I'd be suspicious that GM would replace a small journal block with a medium journal CE motor. It would be more likely that a 65/66 knowledgable Corvette owner may have made the choice for himself outside of warrany.

I can tell you the block we used checked out way above average on thickness and other critical areas. I say it is one of the best stock block foundations. Good luck!