Heres a link that was posted here earlier this week. the author says the difference is 65 pounds. Thats the answer I got the most when I started shopping around for my engine swap. The only thing I don't like about the aluminum block is that I've heard they can't be over bored much. The same link states that the aluminum block can only be bored .010 over, but I'm assuming thats for the 5.7LS1 block.
Gen III GM Small Block: Engine Builder
Quote:
"These blocks already have a 4.0? bore, so they're the best alternative for the guy who wants a bigger motor for his car as long as he's willing to put up with the additional weight (65 lbs.) of the iron block. The only other way to build a big bore motor with a stock block is to buy one of the new 6.0L aluminum blocks, but that's bound to be real expensive."
Last edited by low91; 04-24-2009 at 03:26 PM.
1991 Silverado-L33 5.3L, 212/218 .557 .562 115+4, ASP under drive pulley,180* thermostat, 90mm truck intake w/ LS3 throttle body. Shoenfeld conversion headers and duel Flowmaster exhaust. Performabuilt LVL 1 transmission and 23-2500 stall converter.
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