you need to change the computer or the Prom or chip in the computer and the injection wiring harnes, i guess you are putting a 350 TPI motor inplace of the 305?

[ February 16, 2003: Message edited by: roys63 ]</p>

 

Put in terms of Carbs, it is sort of like putting a 800CFM carb on a motor that is running good with a 500CFM carb. The 305 TPI is matched to the compression, valve train, and combustion chambers of the 305 engine. Now you put on a 350 TPI that has bigger runners, bigger air valve, higher volume injectors and higher fuel pressure and you are stuffing the 305 with the wrong Air/Fuel ratio. Bad move, big disappointment. Going the other way (305 TPI on 350) produces the same bad news, big disappointment.

Trees

 

a buddy of mine swapped the 305 for his blown 350 because he got a good deal on the engine but now it wont run or idle very good and I was thinking it must be the computer is having problems with the new engine because it is different from teh 350