Kevkev5162 Posted December 18, 2015 Share Posted December 18, 2015 So I dove in, spent over 1000 so far in parts with out doing all my homework first. After looking for a replacement exhaust manifold discovered that I have a n42 block with p90 head. Everyone seems to want them for turbo builds but having just put a Holley 390 and Bob sharp intake and a turbo is not the way I want to go. I'm under the impression that unless the pi put flat top pistons my cr is gonna be 7.4. After alot of work I don't want to end up w a car that is less powerful than stock. So there's a few options, shave head, flat tops etc. I'm not ready for a top or bottom end overhaul right now. Is the logical solution to find someone that wants to trade a n42 w possibly some work done to it?there's one on eBay for 350 w spray bar? Is this fair? Wat should a p90 sell for, car has been running, idling, revved but not driven yet so p90 seems in good working order, thanks for any ideas all Quote Link to comment Share on other sites More sharing options...
NewZed Posted December 18, 2015 Share Posted December 18, 2015 Cylinder pressure will give you clue about compression ratio. Quote Link to comment Share on other sites More sharing options...
Kevkev5162 Posted December 18, 2015 Author Share Posted December 18, 2015 This is osted in u build thread, done before alot of pars got ordered so car wasnt runing: Today's project after a 10 hr work day: drain oil, run a cpl quarts through to try to flush out gasoline. I borrowed a compression tester and did a check. The car is not running so the test will come back 10-15psi lower than operating temp from what I've read, also traces of gas in oil I think may make it lower as well. My results came back as follows: cyl 1: 155, cyl2:140, cyl3:140, cyl4:150 cyl 5:130 cyl6:150. Quote Link to comment Share on other sites More sharing options...
Kevkev5162 Posted December 18, 2015 Author Share Posted December 18, 2015 Sorry, Internet's down, on my phone Quote Link to comment Share on other sites More sharing options...
malibud Posted December 18, 2015 Share Posted December 18, 2015 I have a n42 head that I may could trade ? if you want a scope could tell you if you have dish pistons . those are good cold numbers but not really accurate they should come up when the engine is warm. Let me know I am kinda leaving the N/a world after owning a turbo car Quote Link to comment Share on other sites More sharing options...
Kevkev5162 Posted December 18, 2015 Author Share Posted December 18, 2015 That could work out, I didn't want to keep putting out more $ at this point without some miles on the car. I did come across a n42 head on eBay with e88 cam, they want 400 shipped tho, what would the benefit of the e88 cam on that head do? Is your n42 stock? Quote Link to comment Share on other sites More sharing options...
Kevkev5162 Posted December 18, 2015 Author Share Posted December 18, 2015 I am going to do another comp test now that the motor runs. What type of scope would I use to check for the type of pistons? Is there a way to look through spark plug hole or measure through? Quote Link to comment Share on other sites More sharing options...
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