dragonszar
Member
K060812HD - I'm glad you are the second person to confirm 81.2 does not work with the 3" pulley. This is the belt size that come with the 2300 kits(the ones that ship with 3" pulley). Some members here have reported success by doing the smooth idler pulley next to the alternator last. I could not get that to work.Played with the 3" pulley I had here and found out the green belt I had ordered for it was the wrong one. Here is some of the info I've been able to accumulate so far while researching belts.
Edelbrock included belt: Continental Elite 4060820 - 82"/2107mm effective length
This belt does fit the smaller 3", but I believe it will lead to slip since I'm able to twist the belt about 70% of the way when installed
K060812HD - does not work, I made a mistake with the lengths, turns out the effective length is actually 81-1/4"(2064mm). This belt came up short for the 3" pulley and waaaay too short for the 3.25"
Duralast 820K6 - 82"/2085mm belt does not work with the stock 3.25" pulley, it came up too short, I believe it's bc it's 2085mm and the included continental belt is 2107mm even though they both share the 820 numbers, it doesn't seem their effective lengths are the same(22mm difference). This belt does wrap around the 3" pulley though
Duralast 827K6(alternate #:825K6) has a 82.68"/2100mm length and should work for a spare/emergency belt should your stock one snap or you need one ASAP for some reason. This one has a 82.68" length vs the 82" included with the kit how ever it seems it's effective length is 7mm shorter.
Gates K080817RPM has a 81.75"/2077mm effective length, this should be short enough to avoid slip on the 3". It is a 8 rib belt so it will require slicing off 2 ribs for the 6 rib pulley
Gates K060828HD has a 82.87/2105mm effective length, this is only 2mm shorter than the included continental belt, so this one should work with the stock 3.25" pulley since it's only 2mm shorter(even though in inches it looks longer)
Gates K070825HD has a 82.59"/2099mm length, this should work on the 3.25" pulley and should be a good replacement. for the included continental belt, it's shorter than the 828HD by 6mm, so it might be a good belt choice for the 3" as well
K080817RPM For the 81.7 You can just get the 4060817 from continental, it's 6 ribs so you don't have to hack up the belt:
https://www.amazon.com/Continental-Elite-4060817-Poly-V-Serpentine/dp/B000C34KYM
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