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It's ISO spec vs. DIN spec. DIN is Deustch-something and uses the 11-13-15 etc heads. Japanese mostly use ISO spec 10-12-14 heads. If you purchase online check to verify which spec and you'll get...

http://cgi.ebay.com/ebaymotors/Datsun-Z-Series-race-car-78-datsun-280z-race-car-scca-nasa-road-race-autocross_W0QQitemZ250288610314QQihZ015QQcategoryZ6187QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

Thanks for the feedback. I'm running an ASP underdrive pulley and a Fidanza flywheel. It's not the smoothest revving engine I've ever driven but it revs readily, it's not much different from stock...

I run a 240sx with a KA24DE motor in Solo/DSP but I review these forums and often find good background info. Are you guys running 240's in ITA/ITS using the stock crankshaft pulley, an underdrive...

http://www.zeroyon.com/index/content/view/24/47/

Don't know but here's a link to a free FSM in pdf format
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For those that have experienced both for roadracing/autocross/hpde etc, which way would you be running right now based on braking only (separate from cost/labor issues) if you could snap your fingers...