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we have went over this alot. I think there's about a 10 page thread on it. Please use the search function so we don't get into a huge discussion about this again.
 
i remember reading about some guys that were doing some pretty crazy stuff with na ka's on nico. they were sourcing parts from all kinds of nissan engines. Try looking for stuff like swapping the sohc pistons into the dohc block. And i think they were using stuff from the z24 truck engine from the 80's. The one guy i think had it in a datsun 510. I found all that becuase i was looking into itb's
 
high compression pistons, cams, headwork, intake manifold, all bolt ons (3" exhaust, I can link to a dyno if you don't believe me) should put you somewhere well above 200whp. 300 is pushing it, though. I'm not sure if you'd make 300 on a KA ever, since ITB's is pointless for an engine that only revs to 7000 before the crank snaps. I don't think 250whp is unrealistic for a N/A KA with internal work done, and a different manifold. You'd have to make ~190 ft lbs at the wheels at 7000 rpms. Considering stock is about 150 at the wheels, that doesn't seem that outrageous to me.
 
i would say intake exhaust headers u got about 250hp then u wanna go with the apexi vtech controller and get a raidiator chiller, and bov then dyno it u will see that the peak hp is 300 to the wheels and also u ll be running 10 s all day with some heavy duty slicks.

u are very lucky that i m telling u all this information most people pay for this kind of info.
 
Complete Gasket Set
Copper Head Gasket (to 30 psi)
WISECO Pistons
(89.5, 90, 90.5 and 9-1 compression) or
(89.5, 90, 90.5 and 10.5-1 compression)
(89.5 and 8.5-1 compression)

ROSS Stock Bore 89mm Pistons available
(add $100 to kit price for ROSS Pistons )
ROSS Performance Rings
Performance Wrist Pins
TOGA HP Main Bearings
TOGA HP Rod Bearings
Thrust Washers
Expansion Plugs
$899 for kit
http://www.importperformanceparts.net/imports/pek-nissan.html
this might help some
 
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