.040 390 pistons

[chilly460]

Autotec sells a 410 piston, it’s their budget line but nicer finish than the speed pros (I’ve had both side by side) and considerably cheaper than typical Ross/Diamond type pieces.

http://racetecpistons.com/

[My427stang]

Autotec sells a 410 piston, it’s their budget line but nicer finish than the speed pros (I’ve had both side by side) and considerably cheaper than typical Ross/Diamond type pieces.

http://racetecpistons.com/

Nice thing about Autotec is you can tweak it a little, instead of having to live with off the shelf.   I certainly wouldn't compare them to Speedpro, other than to say it's a heck of a lot nicer piston.

[George vega]

I'll check on the mahle pistons. Thanks. I think that any truck piston after 68 was actually a 410 piston with the raised pin to lower compression.

[chilly460]

https://www.jegs.com/i/Mahle-Motorsports-Pistons/644/FFE665080F07/10002/-1

[My427stang]

https://www.jegs.com/i/Mahle-Motorsports-Pistons/644/FFE665080F07/10002/-1

If you are sneaky, you can get them 100 bucks cheaper.  I am pretty sure these are listed wrong but the correct FE piston

https://www.amazon.com/Mahle-930264080-Piston-4-080in-3-89in/dp/B06XYPP8R4

I still like the Autotechs, more flexibility than an off the shelf piston, and likely slightly cheaper

[chilly460]

It’d be interesting to have different manufacturers pistons next to each other to compare.  I have a set of the Mahles I bought used at Carlisle, amazing amount of contouring and features in them.  I know there’s a lot to piston Tech I don’t know

[machoneman]

Whoa, at near $100 per piston, that's a lotta Benjamins! Make the old heavy slug TRW's look pretty good!

[George vega]

The Mahler pack is an .030 piston.