That McLeod 321 setup uses the legacy type arched fingers, which are the ones that tend to hang. Also, it has ceramic material, which is more aggressive wear on the flywheel. Just to comment.
If you slip the clutch a lot, you will notice the flywheel wear. If you don't do any higher RPM shifts, then a hang situation is generally not a concern.
SPEC uses a combo of different materials, carbon fiber, kevlar, etc, which is more 'advanced' that 'legacy' materials. And the PP is a more modern design as well. Being only like $35 more than the McLeod, it's a deal.
Summit carries them at a lower price as I recall.
If you wonder about the quality, homework it, I did. A lot of modern muscle people use them and swear by them.
Just saying. I don't get any money from the sale of them either.
I have never tried any of the newer McLeod diaphragm PPs, but know a few years ago they did update their' offerings & quality.
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
http://forums.maxperformanceinc.com/...d.php?t=760624
1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
https://forums.maxperformanceinc.com...ght=procharger
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