Well, I have been lucky enough to be the victim of such a test......We struggled to get good oil pressure and cylinder sealing with our Indy alum block. I blame the bad machine work for most of our problems. Cylinders were .008-.011 out of round and we later found out, the machining around the #5 cam bearing was hemorrhaging oil like crazy and is probably why that engine threw a rod. Its pretty tough to hone a block with that much out of round cylinders. It beat the hell out of the hone, not sure how good we ended up getting it, but it was bad right from the start, along with the badly clearanced thrust face and other issues....Fastest the car went with the aluminum engine was 6.31....

A year and a half later, I have the same parts plus a new rod and a new piston in an Iron block, and the car has gone a spinning 6.25 in the 1/8th....Everything was the same, the oil pan, the oiling system, cam, head gasket thickness, carb, car.....No other changes except the loss of at least two rebuilds and lots of $$$$$$....

So the car gains probably 200lbs and still went quicker...with the mega block.

I am still really leery of buying another block from anyone to be honest. If you can't trust a shop to use a dial gauge....there is no point in buying it. Unfortunately, like most, mine was prepaid before I got it. Totally sucks on my end, but what else can I do...