I don't think any strats ever had an aluminum trem block, at least not stock.
It's not just that they have a steel block but it's the size of the block and the kind of steel.
Still, to this day the best tremolo I've tried, next to vinatge ones from the 50's are the Callaham. I had a full size, steel block tremolo on my Strat (CS Fender) and I snapped off the tremolo arm in the block one too many times and had to just replace it...I went with the Callaham just to see and was AMAZED at the difference in tone.
Zinc is the usually suspect in MIJ/MIA strats. I like the warmth of Zinc for some applications. I really do like the tone of the Wilkinson Steel block Vintage style trems. A bit narrower spacing but bolt up to a regular mount pattern, push-in arm. They feel like an extention of your hand, no thread lag.
Never stuck a magnet on it to be honest. Never weighed one against the other. Usually the zinc block will get a black residue on it that when rubbed, comes off easily on your fingers.OK, maybe its zinc. Don't know what the composition is, but I'm assuming a magnet won't stick to zink and is probably more lightweight. correct?
Is the Callaham upgrade easily done on an American Standard Strat, or better left to a luthier?
Total no brainer to switch them, 3 screws, but you do have to set your strat up again, pretty much from scratch, since the saddles must be moved or removed to get to the 3 mounting screws.
I'd also recommend balanced trem springs, and the Callaham springs work well. Their saddles are also top notch, no pun intended.
My strat has an "American Vintage Synchronized Tremolo" according to the specs on the Fender site. I assume this is a steel block, or is it zinc? I've had no problems with it so far.
Sorry for the bit of a hijack here.![]()
The Copper Infused Cast Strat® Bridge Block (steel with copper100% metal) provides increased mass and improved tone.