DAW Posted October 11, 2008 Share Posted October 11, 2008 The engine is going to strangle on the small exhaust valves in the e31 head. If the E88 was from an L26 it has the same size exhaust valves as an L28 N42/47 head. Regardless, you want a set of exhaust valves from one of those heads transfered into your E31 head (the E31 seats can be ground to accept the larger exhaust valves). I've run that combo (dished L28 bottom with E31 head) just for a street engine...it's OK, but nothing great (a stock F54 flat-top piston with stock P79 head is better). BTW, stock E31's have soft intake valve seats...are you planning on running unleaded fuel? New rings are way down on the list re priorities here. DAW Quote Link to comment Share on other sites More sharing options...
JMortensen Posted October 11, 2008 Share Posted October 11, 2008 I guess I forgot something... reading DAW's post reminded me that I put 280 valves in my E31. That was larger intake valves and seats and recut the stock exhaust seats for the larger exhaust valve. Oops... Quote Link to comment Share on other sites More sharing options...
HowlerMonkey Posted October 12, 2008 Share Posted October 12, 2008 Any of these larger seats thicker/deeper? I have a head that got wet in a hurricane and it looks like I have a seat that got corrosion between it and the head. Quote Link to comment Share on other sites More sharing options...
Austin240Z Posted November 14, 2008 Author Share Posted November 14, 2008 I know it's been a while, but I finally got a camera and took some pictures. It's pretty dirty by my standards, and I havent run it yet. Quote Link to comment Share on other sites More sharing options...
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