Thread: 1989 350 w/Holley TBI tuning?

Tweet

Great website, lots of usefull info. I do have an exhaust leak at the Y- pipe to manifold connection which may be causing me a lean condition. I'll fix that before going any further on my adjustments. I have a pressure test kit, but Isn't the fuel pressure on these systems controlled by the in tank pump? And just how do you do this mod you are talking about?

Heres a pic of the pressure gauge I got for mine . You can see it with the adapter. I do have it adjusted at 13 PSI now ,not in the pic. Do you have the stock cam?

Since we are on the subject of 89 TBI's here is another mod you might consider for a improvement in the 89 TBI . LS1 fans on the truck. I think it was well worth it you might consider it in the future.