Spray outside the bowl just limits the power unless it is just massively over fueled. The dangerous are is inside the bowl where the metal is the thinnest over the cooling gallery, incidentally right where the 124's put the fuel. The 143's with optimal timing move that up the bowl and the flame front tends upward with the swirl. Add to that the 7 and 8 hole injectors are creating a broader pattern with better atomization than the 5 hole ones even with extra fueling it isn't slugging fuel into the weaker bowl area. The 143's need some timing on a deep spray bowl to optimize and the max timing needs to be controlled, box tunes never were good for that but that is why we have custom tunes.
In a normal usage scenario where we aren't looking to make big power just a solid usable 400-450 HP. Most of the failures on the deep spray bowls are just plain over fueled and heat soaked pistons. Crank the timing out far enough and stuff too much fuel in there and the 03-04 pistons didn't fare any better. As the diagram shows there is not a lot of difference in the thin spots, the difference is the amount of fuel that is allowed to burn over those areas and heat soak it.
Stock timing and fueling isn't going to harm the piston unless it just gets lugged and over loaded but that is outright abuse. The mix of the 2 definitely improves with some timing modifications, even just a moderate bump with Smarty box tunes on timing gains efficiency and power. The BBI.5's in 143 are going to be comparable to the Bosch marine injector and they work very well. I have well over 100k on a set doing a lot of heavy towing and playing, no problems so far.
Now that I jinxed myself better get a Stage 3 cam and some other goodies ordered for a rebuild.
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