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Old 11-28-2017, 03:59 AM   #5
VB242
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Join Date: Sep 2011
Location: Virginia Beach
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The only difference besides the k-jet injector holes are the possibly the size of the cooling ports, the 398 may have the smaller cooling ports which are less likely to deform during a detonation event. I don't think it's as big an issue on the b21 blocks, I've been using a 160 head on my B21F+t but I've had it rebuilt with stainless valves. I wouldn't worry about it for stock boost levels though.
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