374 would be good.

IIRC, we may have tried various ways to stretch the 370 before getting it to go on. I remember having a belt go on the way to the Dragon. Luckily, an Advanced Auto had two belts in stock- I took both. We installed one there in the parking lot- hot motor and a hot day.

 

Bringing this back to the top.

 

You know, this is linked in the FAQ? That is how I find it when I see a belt number

 

What would be the correct belt to run on a AP2 running a completely stock CTSC w/Aftercooler?

I wast thinking of upgrading the belt to either the Goodyear's Gatorback
or a Dayco belt.

anyone have any recomendations as of which one would be better/last longer

Thanks you

 

I got an ASP 4" pulley on the way for my Vortech sc. Should be 12 psi pulley I think.

I am looking at the belts and lists 2 different sizes that seem to work with the 4" pulley. One is for 3.5-4" and the other for 4"-4.5"
Which would be the best choice to go with? The one for 4"-4.5"

4060500 (6PK1270) 50" used with 4 to 4-1/2+ inch pulley May stretch and become loose on 3.8"
4060495 (6PK1255) 49.5"used with 3.5-4.0 inch

 

Bumping with more info to hopefully help someone out in the future.

AP1 Comptech kit with Novi 1200 and 4.8" pulley - 5060393 (6PK0999) fits great on this setup. A little tight getting it on, but is looser and tensions up properly once installed.

 

Looking into same pulley with the same kit for mine but for an ap2(11 psi). What belt did you end up going with?

 

whats the belt size for comptech novi1000 with sos 3.6?

would 4060385 work?

 

This needs to be updated with the SOS supercharger system! I know there is a thread somewhere with strictly SOS info but its all jumbled in there and I wouldn't personally know what to or not to include...