yes b20 with a b16 head is pretty impressive ..
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i dont see why you would need to. a stock b16 revs to over 8k
while im sure a stock b20 block mated to a b20 head only will rev to around 7k
so its the b20 block that needs strengthening ie rod bolts etc to make it more reliable.
Oh okay, so you're not revving it out as high. Right, makes sense. However, at 7000 rpm the B20 will still be sucking more air than the B16 at 8500rpm. Not much more though. About 3% more. Shouldn't be an issue considering how much torque is left in a VTEC engine when it hits redline.
Good call! Still, I like engines that rev out past 7500rpm. :D
The stock ports on the B16a head are actually a little too large for the 1.6L and usually dont need to be opened up much at all. Most of the headwork should be done around the valve and bowl area to get the head flowing better. The B16a head flows more than enough for the B20b bottom end, thats the whole concept behind a B20VTEC, larger displacement bottom end with a high flowing VTEC head :thumbsup: