Injectors/mass air with S-trim

[tonyjr9108]

I recently bought an S-trim for my '91 5.0 and was wondering what size injectors and mass air I should go with. It seems most go with the 42lb and 80mm, so is this sufficient? What about the lightning 90mm mass air? Engine Mods include Anderson N-31 cam, TFS heads ported and polished, TFS intake.

 

[theconductor]

I have a 77mm mass air and 42# injectors. I had 30# until recently and they were not big enough at high rpm's. Go with the 42's.

-kyle

 

[ShortThrow50]

i have 76 mm maf. i wouldnt go any higher than 80 but thats just me

 

[N8Miller]

the 80mm flows better than the 90mm LMAF, so get that one. yes, dont go any smaller than the 42s, esp. since you have ported heads. the 30s will work, but as thedcondutor said, they are gonna be too small probably above like 4k RPMs.