3970010 block casting

[COPO 70 RS/Z28]

was the same physical casting used for all 4 bolt 3970010 applications in 1970. I think that casting # was used for a long time for many different applications but I'm wondering if there is any difference in the casting or machining that would differentiate an LT1 for the others for a feb 70 block??

3970010 350 69 Corvette Late 69, 4 Bolt Main
3970010 302 69 Camaro Z/28, Late 69, 4 Bolt Main
3970010 350 69-79 Truck 2 & 4 Bolt Main
3970010 350 69-79 Pass, Chevelle, Camaro, Nova, Monte Carlo 2 & 4 Bolt Main
3970010 350 70 Corvette 300, 350, 370 HP Bolt Main
3970010 350 71 Corvette 270, 330 HP, 4 Bolt Main
3970010 350 72 Corvette 200, 225 HP, 4 Bolt Main

[YENKO DEUCE REGISTRY]

To my knowledge they are the same.

[Plowman]

High nickle block!!!!

[Nova Jed]

Weren't the percentages cast into the block in the timing chain area? Like 010 or 020. Something like that?

[ORIGLS6]

I have two of those blocks. I'll have to look in the area you're refering to. Never noticed it before.

[COPO 70 RS/Z28]

Im looking at purchasing a block represented as LT1 and dont want to get pinched. You guys are light years ahead of me on this stuff.

[Lynn]

Post a pic of the pad stamping. There are guys on here that can tell you if it is legit.

[Jonesy]

[ QUOTE ]
High nickle block!!!!

[/ QUOTE ]

Here is a 4 bolt 010 block with the 010 and 020 cast into it.

[COPO 70 RS/Z28]

[ QUOTE ]
[ QUOTE ]
High nickle block!!!!

[/ QUOTE ]

Here is a 4 bolt 010 block with the 010 and 020 cast into it.

[/ QUOTE ]

So would the nickle content markings be different for say the 270 hp vette block?

[Jonesy]

I believe they would be the same.