I have a Bill Mitchel aluminum block for about 8 years, freshened it once and it was like new on the inside, had zero trouble with it. Runs 9.70's in a 3200 lb car. When I got it I had it bored, honed the lifter bores, and put it together. Use Edelbrock victor Jr. heads, had to clearance the area behind the push rods a little but no big deal.