Every little bit helps but you do want to get good value (power / durability) for each dollar spent...

I need to go back to my notes but there were some factory light weight lifters, lighter then the "bar bell" type.
I find them mostly in aluminium block SL6 engines, also in the early "Commando" HiPo 273s

These lifters are straight sided, actually a piece of tubing with a hardened face & cup, all furnace brazed together.
I think those lifters weighed-in at 88 grams.

When I see them, I save them, then get them resurfaced for re-use.
DD

is there any weight to be removed from the regular stock lifters? if a guy were to chuck them up in a lathe and maybe remove a bit from the barbell area? either length or diameter?

Assuming they're solid (which I think they are), you could probably shave some off the inner corners if you wanted to drop some weight without noticeably reducing the strength of the lifter. Basically chamfer the two inner edges of the barbell that are separated by the necked-down part. I wouldn't go down as far as the smaller diameter, but I'm sure you could add a ~1/8" chamfer on both sides without affecting the strength. You obviously don't wanna screw with the top or bottom surfaces.

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Somehow I ended up owning three 1964 slant six A-bodies. I race one of them.
Escape Velocity Racing

I would be careful about making the small dia portion lower. With a big cam, the part of the lifter might drop out of the lifter bore. Might or might not cock, slightly, and catch the lower edge of the bore.
Not an issue with slants, but I know on the small block V-8 the small diameter of the lifter can do this, and you will tear out your hair, trying to figure out where your oil pressure went.
You need to either use straight sided lifters, and/or bush the oil galley.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

I'm still not seeing a realistic rationale for worrying about the weight of lifters in a Slant-6 engine. It doesn't matter. It really doesn't.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Yep, you'll never measure any gain on the dyno from them or see any gain at the drag strip or any other venue. It's like light pistons and rods or lightweight cranks, they will not increase power or ET's, they'll only make your wallet lighter along with them. It's all part of the marketing "hype" of selling parts in the performance industry.

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There's no such thing as too much cam....only not enough engine!

IF I were building a race engine, I would buy pistons that used narrower rings to reduce friction before I spent the money on lighter lifters.

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Casually looking for a Clifford hyperpak intake for cheap.

For what it's worth are these lifters the solids that have the push rod socket and retainer circling so they basically look like a hydraulic? If so, your weight savings may dwindle somewhat when you fill them with oil. They are likely reboxed lifters that the sales department have thrown a spin on. Weigh up a good quality unit like a Crower or a Bullet and there is likely probably bugger all in it. I'd rather a refaced stock unit personally,there is zero advantage in the range of operation a slant lives in for a lightweight lifter....rings and Pistons is where you'd see gains if you are looking beyond the usual...not that thin rings are exactly cutting edge now days.

That's a very good point.

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Somehow I ended up owning three 1964 slant six A-bodies. I race one of them.
Escape Velocity Racing

To be fair, we are overlooking one benefit these amaze-o lifters do bring: when standing around bench-racin', you get bragging rights. Ayuh! Pulled the trigger on a set of Comp 84g lifters.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

They would be good for a class engine where you are looking for every last .10 horsepower you could find, but other than that not so much.

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Official Cookie and Mater Tormentor.

Ferrea light weight .904" lifter is 63g...makes a comp at 84g claiming to be lightweight look lame,which is typical for a lot of comp stuff. Ferrea claim with a hollow stem valve AND these lifters you can get another 500rpm....now that's in a high rpm engine...in a slant lifter weight would be virtually irrelevant..even in high rpm solid roller engines many guys are running a larger diameter lifter,over 1" diameter custom made by Crower amongst others, this allows them to run a large diameter roller for service life,these street trip engines can spin 8000 with ease and with a stable valve train...lifter weight is not a major consideration in the overall package,perhaps in a class limited build but that's about it.
I'm sure with a Comp Thumpr,Comp Bootlegger or Comp good ole Blues Bros cam grind from Comp combined with a set of Comp lightweight Comp lifters the marketing dept at Comp can convert your slant into a engine masters competitor... did I mention Comp??

I think there is more than a trigger being pulled with these lifters.