zolorin Posted November 17, 2003 Share Posted November 17, 2003 will a larger valves on a L28ET improve the flow in and out of the engine. Will it worth extra $100 to go for 46/38 vs. 44/35 mm on the valve size. What problems can it cause on the head and what kind of precaustions I must take to not get in trouble. Quote Link to comment Share on other sites More sharing options...
Guest Aaron Posted November 17, 2003 Share Posted November 17, 2003 Look for the post by 240Z Turbo on P90 head porting. Here is is. There may be some information in there that will answer your question. Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted November 17, 2003 Share Posted November 17, 2003 I had my P90 re-built with the MSA stage II turbo cam. My builder was going to put a larger exhaust valve in it. He did not because, according to his flow bench testing, the small bore of the stock L28ET restricts the flow of the larger valve. He found the stock sized exhaust valve, accompanied with some unshrouding, outflowed a larger (2mm larger?) valve. A bigger valve would certainly make sense in an overbored engine though. Quote Link to comment Share on other sites More sharing options...
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