[elevator man]

Sorry, I also posted in the welcome section but I was unsure if anyone reads those.
Hello everyone, I am looking for information about an engine that I purchased that was attached to a custom 1971 boat. I think I know what I have but, I want to double check to make sure the hole in the water was worth my time.
The engine block has 3963512 cast into it also GM/1/conv1 and what looks to be 1 10 9 cast on the other side.
The heads have 3964291 cast into them with GM5T, L 6 9 and HI-PERF cast also.
The engine only has about 200 hours on it and under the valve covers looks new.
It has an Edelbrock intake and Holley carb.
I was told the intake and carb were stolen and replaced with the aftermarket ones.
Any help confirming the identity and a possible value would be appreciated.
Thanks
Keith

 

[Guest]

Just make sure that it isn't rusted to much in the cooling areas around the cylinders b/c of being a boat motor and you are good to go.

Worth, it's worth 50 cents more than you paid for it, imho. I have a good set of SB -291 big valve heads and I think like this regardless.

Sorry, your's are BB -291's, my bad.....

pdq67

Best Car Insurance | Auto Protection Today | FREE Trade-In Quote

 

[Mike]

It could be just about anything by now.
The block was used for 427's and 454's but could have been modified or bored and stroked to ???
3963512 427/454 69-71 335-450HP 2 & 4-Bolt COPO
1 10 9 would be just that -Jan 10,1969 so this one would have started as a 427.
3964291 396/402/427/454 69-70 2.19/1.88 108cc L-78/L-71/L-72/LS-6 Rectangular port 325cc intake
L 6 9 would be Dec 6,1969 so these don't match the block as there 11 months apart.
Unless you've mis-read the 1 10 9 on the block -make sure it's not an L.
If you want to know what the block was born as ,get the 'engine id number' as shown ,top right in pic

 

[savethecars]

Heres casting numbers for your block


3963512
1969-71
427/454
4.25
335, 390, 400, 425 COPO


check out this link for more info

http://www.chevellebigblock.com/pdf/BigBlockBlockCasting.pdf

 

[elevator man]

For the engine ID and VIN code I need to pull the head? Will either side have the numbers?
Thanks for your help.

 

[Mike]

Nope,look at the pic.
Front of block ,right ( passenger )side.

 

[Tom Mobley]

512 blocks often get the bigbux from the Corvette guys. sometimes real big bux.

 

[elevator man]

ID Number is T04070CRV.
Thanks
Keith

 

[animal69]

CRV 1970 Chevelle 454 450 Mt LS-6 HP

That is a good one.

 

[elevator man]

Does anyone have an idea of a value? I will probably be selling it as soon as I can find out how much it may be worth. I am sure it is worth something to the right person. It does start and run strong. I may be bringing it to the Autofair in Charlotte next week
Thanks
Keith

 

[motor]

Here is handy casting info www.mortec.com

 

[Mike]

Like I said earlier ,go back and recheck the block casting date.
You posted a 1 10 9 (Jan 69) with heads from L 6 9(Dec 69) which makes it worth less than an original.
I think you mis-read the 1 so check it again.
While your at it ,post the partial VIN.

 

[elevator man]

Would the VIN be in the same spot as the ID Number? If that is the case, no VIN is present. Again, this is in a custom boat that the build was started in 1970. I was told it was purchased prior to it being installed in a vehicle. Not sure if that was possible and I have no way of knowing.
I will check the casting again this evening.
Thanks
Keith

 

[Mike]

Try here

As it has an ID from a vehicle ,it was removed from it and put in the boat.
And again -recheck the block casting date.
BTW ,this a salt or fresh water boat ?

 

[elevator man]

I checked in the location you said. Nothing there either. Casting looks rough as the rest of the block. I t does not look like it has been ground or sanded. Any other ideas?
Keith

 

[elevator man]

Oh, fresh water only. I checked the hour meter it says 224 hours and was working when I parked the boat.
I also checked the block numbers again. It could be 1 or probably an I. If it were an L, i wold be missing something.

 

[Mike]

Might be to your benefit.
BTW ,did you recheck the block casting date?
I keep asking because if it's actually an L ,your engines worth more.
Take another look see up by the engine id and make sure there's no partial VIN there.
Sometimes there stamped thinner than the Tonawanda code and hard to see.

 

[elevator man]

I can't find anything near the ID # only the ID stamp. I posted again about the L stamp. It is either and I or and 1. If it is a L it is missing the _.