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headbolt torque with flat top pistons and n42


frank280zx

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Guest bastaad525

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.

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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

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