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Originally Posted by rocketman
Aluminum would be the best,all your pro mod,pro stock,etc blocks are aluminum.but at 3500-4 g its kinda pricey for a street car.
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Very true-- I should have said for a street car.
Correction though, Pro-Stock blocks are cast iron only by the rulebook.
Most TAD/TAFC stuff I've seen are billet aluminum blocks... definately not streetable in any way since they're dry.
If you can get over the cost, my only gripe with an aluminum gen-1 SBC on the street is you usually have to beat it into the owners head that there can be absolutely no high-rpm / high load duty until it's fully warm so the main clearances are at spec. The last aluminum street-duty SBC I helped with came back the first week for an oil pressure issue... it had goobered up bearings because the guy admitted to beating on the sucker just after starting it.
If it was race only it would have been built looser and it wouldn't have been a problem. The owner was warned to take it easy until the oil temp came up but he didn't listen.