i wana put a set of l92's on an lq9 engine. i've been told to be careful with cam selection due to piston to valve clearancing issues because these heads have huge intake valves. lift isnt the issue im told, its duration i have to think about. id like to know just how much duration can i get away with? the heads are GMPP cnc l92s with stock size valves and 68cc chambers. it will be carburated as well. any input on this will be greatly appreciated.

 

Car craft did a great article on this if you google l92 heads you will find it with very little effort. They ran the Comp cams xe287hr cam in a bone stock LQ9 shortblock and had a mile of clearance still, so pretty much any cam with similar specs should be safe . Its still a good idea to check PTV clearance.

 

thanks for the info man!!! ill check it out.

 

search this forum for l92 you will find a ton of info