Allegedly a Hitachi HT07-5 from eBay, on a CP21S F6A DOHC 16V
Would need some sort of modification near oil warmer and filter
– Coolant flange not compatible with the stock RHB31
Piston Rings
F5B (DOHC:TURBO 21D // 2V:CARB 21A // 2V:TURBO 21B // 4V:CARB,DOHC:EPI 21C) 12140-70B60 Replacement 12140-73D00 F6A (DOHC:TURBO 21D // 2V:TURBO 21B) 12140-50E50 F6A (2V:CARB 21A // 4V 21C) 12140-50E00 Replacement 12140-73D00 F6A (4v 21C 01.1990 – 01.1991) 12140-60D10 Replacement 12140-73D00 TP Rings (Teikoku Piston Ring Co., Ltd, TPR Co., …