[Michael Kilduff]

Actually I'd be very suprised if GM used 'high nickel' in production blocks. I remember tearing down quite a few sbc's of 60's and 70's vintage out of crashed up cars in yards that had the 010 and 020 numbers in the castings...if that indeed correlated to high nickel content surely the cost to produce would be higher than using iron instead. Some of these blocks/engines were 307's and low performance 350 impalas and chevelles-4 door 2 barrel cars. No need to put expensive castings in those kinds of cars I would think.