frank280zx Posted April 13, 2004 Share Posted April 13, 2004 I was wondering, i'm at the point of assembling my f54 flattop n42 headcombo, thus raising the compression, do i need to compestate this with more headtorqeu to prevent the headgasket to blow? or is o ringing the only way? Quote Link to comment Share on other sites More sharing options...
Guest Fredrik280zx Posted April 13, 2004 Share Posted April 13, 2004 You can use the turbo head bolts and increase tourqe. http://hybridz.org/nuke/index.php?name=PNphpBB2&file=viewtopic&t=32124 Quote Link to comment Share on other sites More sharing options...
olie05 Posted April 13, 2004 Share Posted April 13, 2004 I am using arp head bolt studs on a similar combination... Can I go over the specified torque of 60 lbs? I was thinking maybe 70... would that be ok? Quote Link to comment Share on other sites More sharing options...
akeizm Posted April 13, 2004 Share Posted April 13, 2004 W00t headbolts! My Z have very high compression with flat top pistons. I'm still using the standard torque settings that are said in the manual and on the headgasket package. Final setting about 75. Quote Link to comment Share on other sites More sharing options...
Guest bastaad525 Posted April 13, 2004 Share Posted April 13, 2004 75 ftlbs on the head bolts seems kinda high... isn't factory more like 50ish? A high compression setup, at least of the kind you are running, doesn't need anything special as far as stronger bolts or more torque than usual. I agree that it's good insurance to go with the turbo head bolts as opposed to the N/A bolts, they are stronger. Quote Link to comment Share on other sites More sharing options...
z-ya Posted April 13, 2004 Share Posted April 13, 2004 I used stock used L28 head bolts on the same setup. I torqued them to factory specs. No leaks so far. I think the most imortant thing is to have clean and flat surfaces, and use a good quality gasket (Nissan OEM if you can). A freind of mine runs Nissan head gaskets on his L28 powered 300ZX SCCA GT2 car (~14:1CR), and swears by them. They are kind of pricey ($48 through Courtesy with club discount). Rember to clean the head bolt threads, and also oil them so you get an accurate torque. BTW 70ft-lbs seems high. The turbo bolts I think should be torqued to 68ft-lbs. NA bolts I think are around 55ft-lbs Pete Quote Link to comment Share on other sites More sharing options...
johnc Posted April 13, 2004 Share Posted April 13, 2004 With 14 bolts spread over such a small area, you don't need high torque numbers. Use the factory specs. Quote Link to comment Share on other sites More sharing options...
Guest bastaad525 Posted April 14, 2004 Share Posted April 14, 2004 haynes manual specifies 55ft lbs for both N/A and turbo Quote Link to comment Share on other sites More sharing options...
akeizm Posted April 14, 2004 Share Posted April 14, 2004 I think the number I said was refering to Nm. Bah I cant remember, there were 2 different measurements on my torque wrench. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.