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L92 heads
Looking at the ports on this head, I have a couple of observations. The first thing that springs to mind is the very large intake port, it reminds me of the pinto days. However it looks like the chevy engineers have been able to make it flow a lot better as cast than that ford engine however, so the tuner has a bit less of an uphill battle. The large split in size between the inlet and exhaust valve is worth noting as well, favouring cams with a fair split between intake and exhaust duration. Why did they do that?
One other small observation it the exit of the exhaust port. the port in the head is quite a bit smaller than the exhaust manifold, by about 1/8" all arround, also the head port is D shaped, with the manifold being circular. Not sure what is goin on there either. (Could it be a mechanism to reduce reversion? Is reversion even a problem with the stock cam?)
with a performance cam, will it be better or worse with port matching here?
With so many LS engines in the hands of gearheads, and the low cost of these castings from GM, there is a lot of interest in getting the best from these new heads.
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