I don't know about the size you need but my GMC Syclone had 28.5 stock and it was
bad about knocking under turbo boost. I changed to 32 pound injectors and pretty
much cured the knock. Did not idle rough, did not run over rich and did not hurt
gas mileage. BTW that truck got 13 mpg in town and 18 mpg on hwy with a 280 hp
4.3 ltr v6, all wheel drive 4 speed auto and 3.43 axle ratio
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