Some guy on a ontario / quebec GP club says this :

The thing is the N/A engine have higher compression, so they heat up more under the same pulley size when compared to a L67 which has lower compression. This is why ZZP has made the 4.0 and 4.2 pulley's (with the offset) to use one belt. It looks like you're going to grab the other pulley's, crank pulley, etc?...then you'll run two belts like the L67's but internally the engine is still a L36. Now I would presume that 4.2 and not larger was done so if you did just basic mods, like the minimum, Ported manifolds, DP w U-bend delete, plugs, Stat and PCM should be fine with a 4.2.

Is he correct or lieing.