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Hello, i have a 89 gt with kenne bell twin screw supercharger with i believe blue top ford 19# injectors. What size should i use? It has stock cam and stock heads looking to upgrade those soon.
 

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I would recommend a minimum of 24# with stock heads and cam, however since you have more upgrades in the future I personally would put in 30# mass and injectors, that way they will still work when you get new heads etc.
 

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Also I believe that the blue top injectors are the 24# and the stock 19# injectors are orange in color.
 

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N/A and boosted require differnt type injectors. IOW if your making 250rwhp N/A you can use 19-24's. Boosted 250rwhp would need 30's IMHO
 

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You should be good with the 30#s for a while
 
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