The 437 kit will probably generate enough heat to warp the aluminum heads, too expensive for me to dish out that kind of cash. A 90cc bore and stroke is a bit much for a small motor, just my opinion. Regardless if Mickey runs the shop or not I'm still not gonna take the chance of taking a big **** on my motor. With the 400 kit you can at least make sure no one drops a jelly donut in your motor while it's being rebuilt, and the extra generated heat is reasonable. ;D
The heat in "our" motor really only becomes an issue when you remove to much metal from the sleeve to achieve the large displacement thus leaving less of a "heatsinking" effect & do not run an oil cooler. Since the displacement difference between the 400cc and 437cc kit is primarily due to a larger STROKE/lowered deck height and NOT BORE the heat differences are not to substantial and are actually very comparable to each other. The Warrior motor is very cumbersome and comes chock full of extra metal to begin with - this is how the Warrior in particular gets away with such a huge kit. The FST stroker kit actually uses a LIGHTER THEN STOCK custom made JE piston (can’t say so for your hotrods kit, Powroll, Alba, etc...) that contributes an extreme amount to reliability and a rev happy motor.
Heat between the 400 and 437 kits is definitely NOT a huge margin apart with the Warrior when using STROKE/deck height to increase displacement paired with an oil cooler. The primary threats the stroker Warriors is recognized as over-rev (piston speeds above 4,200 - 4,300 FPM) and the bottom end rod bearing. You can call up any company (Powroll, FST, & even Hotrods) and confirm the above facts.
I work in a Race Performance Factory Pro tuning shop and have done MANY MANY powroll, FST, & Hotrods kits in several machines. I am happy to say that all when built right provide awesome reliability and good gains. But when it comes down to it if I was going to spend the money to have the case cracked and a stroker kit put in, id make it worth my while and have the best more powerful one put in.
*Also remember the warping of your head is just as much as a threat to our motors even in stock form, in 400 kits, and 437s +. To fix a warped head it’s as simple as just getting it planed; condition providing.
Honestly Box if your primary fear of the strokers is heat you’re not worried about the more important serious threats that will destroy your motor even with the hotrods kit. An actually now that I think of it since we have our "cool guy" Dyna CDIs with a set rev limit; that will actually protect us from excessive piston speeds (sucks for the rest of them).