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roverdave81 · 20-04-10, 10:42 AM

standard piston will take 15psi as long as you get the fuel right with out problems as long as its the 220/420 engine the 620/820 used dif pistons and are only go for 12psi max my old 220 gsi ran 14psi and never let me down

20-04-10, 10:42 AM	#11
roverdave81 Member Join Date: Oct 2008 Location: coventry Posts: 544	zs 260 standard piston will take 15psi as long as you get the fuel right with out problems as long as its the 220/420 engine the 620/820 used dif pistons and are only go for 12psi max my old 220 gsi ran 14psi and never let me down