302 69 block numbers

[rally]

is their any truth to the numbers cast in front by the timing chain area that these are high nickel content information. i heard 10/20 is a high nickel block is this true? also my numbers read 618
                                                                                                                             632 in this front area. what do thse numbers stand for anybody? thanks guys.

[68Zproject]

http://www.camaros.org/forum/index.php?topic=4291.0

[asm69]

i read the link topic "http://www.camaros.org/forum/index.php?topic=4291.0".
concerning 69z28 blocks I agree with John Z. as well as the others.

I also found an article in the Magazine Speed and Supercar dated April 1969.
There is an article titled Chevys Dynamite z-28 written by Martyn L. Schorr.
Within that article they discuss the components that make up the z-28.
One paragraph in particular mentions the block. The quote is,

'The 69 z-28 utilizes a new block with super-heavy-duty main bearing webs
which are cast oversize at the foundry and trimmed down for crank clearance
later'.

I'm not sure if they are just commenting on the three center 4 bolt main caps.

Comments welcomed.

asm69

[JohnZ]

'The 69 z-28 utilizes a new block with super-heavy-duty main bearing webs
which are cast oversize at the foundry and trimmed down for crank clearance
later'.

There is nothing special or unique about the block casting used for Z/28 engines - it's just another 4"-bore 350 block, used for hundreds of car and truck applications; neither the foundry nor the Flint V-8 machining department had any way of knowing what its final configuration would be - that wasn't determined until the finish-machined block went down the engine assembly line and had its internals and externals installed, and was stamped "DZ" if it was for a Z/28. There's no such thing as a "DZ block", although lots of eBay sellers would have you think otherwise; it's just a 4-bolt 350 block that has Z/28 parts on it.

[rodent]

http://www.nastyz28.com/forum/showthread.php?t=10896