1969 DZ bare block value?

[jer]

Originally Posted by ZLP955

The 'high tin/ high nickel' story is actually just a myth, John Hinckley posted about this over at CRG:
"And, as it turned out after further research with the Saginaw Foundry (now called Saginaw Metal Casting Operations, part of the GM Powertrain Division), the old story many of us were led to believe about the 010/020 describing the tin/nickel alloy turns out NOT to have been true at all, although the magazines thought it was true and continued to publish the tale, and still do today.
Actually, the "0M10/020" cast into the front bulkhead under the timing cover turned out to be simply the identifier for the foundry pattern for the front bulkhead, which was shared by the 3970010 (350) and 3970020 (307) blocks; it had nothing to do with the iron alloy, which was never altered for any particular production block (although the alloy was altered for some later low-volume GM Performance Parts over-the-counter "Bowtie" blocks)."

I've always thought this may be the case since every 010 block and every 020 block I've seen has these numbers on the front. My 396 3969854 has "272" and "512" cast into the front. That's something I'd never seen before.

[earntaz]

I've also heard that both SBC and BBC blocks that were to be used for "marine" applications were a high nickel content ... TAZ

[Kurt S]

Bergy can confirm, but there was only one supply of iron in the foundry. All blocks used the same.

[MarcDant]

Did GM use ferritic or ductile iron to cast 4 bolt caps and flywheels .If so is it possible that some blocks were also cast with same iron.Thanks Marc.

[Hotrodpaul]

I think the blocks and 1st and 5th main caps are the same. High performance blocks and some truck applications after 1968 got nodular 4 bolt maincaps on 2-4 positions, identified by the N cast near the part number. I also had a 1966 L-79 Chevy II and I believe it had nodular 2 bolt caps. Usually these caps came with forged steel tufftrided cranks as well.

Paul

[big gear head]

2482 caps are nodular iron and as far as I know all of the 400 blocks got nodular iron caps.

[frankk]

Great....so whats a 2482 cap????

[NorCam]

Main caps found in many high perf blocks.