Diseazd Posted July 11, 2014 Share #13 Posted July 11, 2014 (edited) Good point Steve......Felpro makes a short valve seal that I use on my E31 head with the .490 lift Isky Stage III cam. It is supposed to handle up to .500 inch lift.Improved L6 Valve Stem Seals - L-Series - HybridZYou can use the stock valve seals on an .080 inch shaved P79 or P90 head because the valve springs are shimmed up .080 inches with the longer early L28 valves when you use the Isky Stage III (.490 lift) cam though. Edited July 11, 2014 by Diseazd Link to comment https://www.classiczcars.com/topic/49602-e-31-head-whatchall-think/?page=2#findComment-451382 Share on other sites More sharing options...
Walter Moore Posted July 11, 2014 Share #14 Posted July 11, 2014 My apologizes to everyone, it was Blue who posted photos showing the exhaust valve interference with big valves to the stock L24 block. I don't know how I got so confused.See post #4 in this thread:http://www.classiczcars.com/forums/engine-drivetrain-s30/18819-notching-240-block.html Link to comment https://www.classiczcars.com/topic/49602-e-31-head-whatchall-think/?page=2#findComment-451398 Share on other sites More sharing options...
siteunseen Posted July 11, 2014 Author Share #15 Posted July 11, 2014 Well I can hardly wait to measure the seals that are on there now. They're the same blueish green color as the Fel-Pro # SS72686 recommended in the hybridz link. The head came from a knowledgeable Z guy it seemed. His Dad was big into Zs and held onto this E31 head and the Weber 40s for his son who unfortunately had to sale the project, lucky for me though. The only thing I'm doing different than his plan is using flat pistons instead of the dished ones that came with the deal. He too was saving for the cam kit when his new paint and body shop's bills jumped to the front of the line. Life happens.Thanks guys for the help, I can't read or buy y'all's experience. Link to comment https://www.classiczcars.com/topic/49602-e-31-head-whatchall-think/?page=2#findComment-451406 Share on other sites More sharing options...
siteunseen Posted July 11, 2014 Author Share #16 Posted July 11, 2014 (edited) So the competition cam will clear pistons okay?I'll be searching for the right head gasket thickness and if that lowers the compression too much I'll go with the stage III.Hybridz here I come. I'll have to take a Valium though, those guys can be intense.Maybe I'll just be safe and get the stage III like Dizeased suggest, I'm not going racing. Edited July 11, 2014 by siteunseen Link to comment https://www.classiczcars.com/topic/49602-e-31-head-whatchall-think/?page=2#findComment-451407 Share on other sites More sharing options...
madkaw Posted July 11, 2014 Share #17 Posted July 11, 2014 From all I have read-don't go with a thicker gasket to lower compression. Keep the squish tight to fend off detonation. So far good luck with my Nismo 1.25mm Link to comment https://www.classiczcars.com/topic/49602-e-31-head-whatchall-think/?page=2#findComment-451413 Share on other sites More sharing options...
siteunseen Posted July 11, 2014 Author Share #18 Posted July 11, 2014 From all I have read-don't go with a thicker gasket to lower compression. Keep the squish tight to fend off detonation. So far good luck with my Nismo 1.25mmSo you have a stage II? Which company? and do you like it or wish you had gone bigger? I've watched your videos and enjoyed the chirp into 3rd gear.Thanks,Cliff Link to comment https://www.classiczcars.com/topic/49602-e-31-head-whatchall-think/?page=2#findComment-451416 Share on other sites More sharing options...
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