madkaw Posted February 18, 2015 Share #49 Posted February 18, 2015 I was suprised the sanding drums cut the block myself. It's a slow process and you will burn up a lot of drums, but slow is better. Or you could start out with a steel carbide and finish out with the sanding drum.A plan is good Link to comment Share on other sites More sharing options...
siteunseen Posted February 19, 2015 Author Share #50 Posted February 19, 2015 Well I have an idea of what to do. I took a bare N47 and put the exhaust valves in held up by clothes pins then chucked them to a drill and spun some marks on there. Then I used a pink grinding stone that came with my Dremel. One or two I'm not happy with but I'll get more practice tomorrow. 1 Link to comment Share on other sites More sharing options...
rossiz Posted February 19, 2015 Share #51 Posted February 19, 2015 are you notching for clearance due to high-lift cam, or just to de-shroud for flow? Link to comment Share on other sites More sharing options...
siteunseen Posted February 19, 2015 Author Share #52 Posted February 19, 2015 are you notching for clearance due to high-lift cam, or just to de-shroud for flow? I've got an E31 with exhaust valves for a N head, which are larger and just barely hit the edge of the bore. From zhome.com E31 HEAD '70-71 240Z This head has a 9:1 compression ratio. The quench area is the best of the Z heads with the exception of the P79. As stated before 280 valves are an easy installation and recommended. A note of caution here , however, if the 280 valves are used with a stock 240 or 260 bore ( they're the same) you will need to notch the block for the intakes. They JUST touch and make a hell of a noise ( take my word on this I know). If an oversize bore is used here then clearance is not a factor ( even a .010" overbore will do). This is considered by many to be the "best" head because of the "better" quench area and higher compression. I can't decide which to do here. Please advise me somebody (named Steve). Link to comment Share on other sites More sharing options...
siteunseen Posted February 19, 2015 Author Share #53 Posted February 19, 2015 Nissan has the turbo head bolts for less money, $60 for mine locally. PNsNine of the shorter ones 11056-P7600Five of the long ones 11059-P7600 1 Link to comment Share on other sites More sharing options...
siteunseen Posted February 19, 2015 Author Share #54 Posted February 19, 2015 Holy guacamole! I've been focusing on the exhaust valves but it's actually the intakes that will hit. Thank goodness I did that to a spare block. I'll get the intakes out and see where they hit. I almost stepped in a big ole pile of doo doo. Link to comment Share on other sites More sharing options...
Captain Obvious Posted February 19, 2015 Share #55 Posted February 19, 2015 Wow. Glad you caught that one before it was too late! I don't remember the last time I had that sick to the pit of your stomach feeling when you realize that you just screwed up royal and it's irreparable. No no no no no no no nobody's fault but mine! I think the last time I did that was when it was already midnight, the car show was the next morning, and I had just realized that I forgot to slide the flare nut up the brake line before I put the flare on the end. It was already too short... "I did NOT just do that." Link to comment Share on other sites More sharing options...
siteunseen Posted February 19, 2015 Author Share #56 Posted February 19, 2015 That's my favorite Led Zeppelin song! EDIT! One of my favorites, The Ocean's pretty good too, it be easier to name their bad ones than the good. I can't even think of one right now but I'm about to crank up Nobody's Fault RIGHT NOW. My neighbors are at work, work's for suckers. Na na na na na nobody's fault but my-eeeine Link to comment Share on other sites More sharing options...
Captain Obvious Posted February 19, 2015 Share #57 Posted February 19, 2015 Fantastic idea!! My work here is done. Mission accomplished. Link to comment Share on other sites More sharing options...
siteunseen Posted February 20, 2015 Author Share #58 Posted February 20, 2015 Fantastic idea!! My work here is done. Mission accomplished. Lumosity wants money, you are helping me for free. Link to comment Share on other sites More sharing options...
rossiz Posted February 21, 2015 Share #59 Posted February 21, 2015 good to see more happening - i'm watching & learning... and thanks for the tip on head bolts, i picked up a set of turbo bolts from courtesy nissan for $60 as well - a $40 savings over the last set i bought from dpllc, and those were the NA bolts... Link to comment Share on other sites More sharing options...
siteunseen Posted February 22, 2015 Author Share #60 Posted February 22, 2015 Boy oh boy do I feel bad. Whole body ache, my head's worse. 102 temperature this morning. I know I'm sick when I don't even want to read classiczcars.com. Link to comment Share on other sites More sharing options...
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