Stock Ca Radiator :
670mm wide, 
500mm height*
470mm height from bottom of bottom pipe mouth to top of top pipe mouth

R34 Gtr-v spec Radiator :
Width 660mm
Height 520mm
Tank depth 30mm (core depth is about half this)


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http://www.nissansilvia.com/forums/index.php?showtopic=66074

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12217078

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http://www.slidewizeimports.com/products/index.go.html