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Originally Posted by BrentB@TEA so you used a fixed pefectly radiused inlet on all the heads you tested? No problems with the port matching up from several different vendors?
I would think the playing field isn't even if it was radiused and sized to your own CNC ports.
Just a thought..no ball busting intended. |
Just to clarify....the inlet we use is slightly larger than our port...slightly. No clay at the transition (between head and radius plate) is necessary. If I flow a head that is significantly smaller than ours (rare), I would use a thin smear of clay where the radius would transition into the slight forward lip the smaller entrance created. Some of the larger heads were opened up slightly at the entrance and our radius plate on those heads makes for a "net" fit or is slightly smaller, but with the radius plate positioned right in the center, there has never been a step (going the right way) of any significance. Whats interesting to note is that heads that are low 200 cc's compared to heads that might be mid 240's don't have a much different sized entrance....the primary reason being it would take a heavily massaged intake manifold to fit, not to mention the available cross section of the entrance is really enough to get the job done anyway.
Keep in mind that all the info recorded over the last 18 months or so was not being gathered to post up on LS1 tech one day...It was for internal use to see how we compare to the cross section of heads on the market. We would have only been kidding ourselves by not properly flowing all of the heads in question.