MMS and WOT-Tech are not lighter as far as pushrods go. As far as valvetrain goes, pushrod weight is not nearly the same factor as the weight on the other side of the rocker (valve, retainer, keepers). The stiffer the pushrod, the better. The lovely thing about 60v6s, is the incredibly short pushrod compared to just about every other pushrod engine.
I don't know why you say wot-tech is down, it hasn't been down for a long time. We are on the same server as 60degreev6.com. Check and see if that site is working.
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