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when to replace SU CARBURETORS SM NEEDLES?


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Ztherapy refurbished both of my 3 sscrews roundtop SU Carbs and install Brand new SM Needles on them. My car engine is not stock it has been upgraded to 2.6 L with oversized pistons and a Shneider 274F Camshaft. Should i consider changing the needles to another type to get a better performance at idle?

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Nice! But quite expensive! im using the gunson colortune. Ill let the car warm up and race the car for 10 to 15 mins and then pull the plugs out to see if i can achieve the dark Brown color on the plugs.

Edited by jalexquijano
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