swapping a 305 for 350 TBI in a 89 - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

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post #1 of 3 (permalink) Old Sep 16th, 99, 01:01 PM Thread Starter
Join Date: Sep 1999
Location: terrell,texas USA
Posts: 1
i do now how to build switch out motors but the computer is what i am refering to some say if u put a chip and a 350 thottle body then it will work and some say u have to swith out the whole ecm and i want to know before i waste any money
any comments would really help

ive called jegs and summit even asked locals but none are really sure
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post #2 of 3 (permalink) Old Oct 15th, 99, 07:43 PM
Join Date: Aug 1998
Location: Fort Worth, Texas
Posts: 3
I assume you are switching to a 350. According to my information, you will need to switch the prom or the entire ECM. The throttle body flow should be adequate. The most you are allowed to increase displacement is about 10% before you have to make changes to the computer. 10% of a 305 rounds off to 30 cubic inches, so a 350 engine will be well above 10%.
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post #3 of 3 (permalink) Old Oct 16th, 99, 03:19 PM
Join Date: Aug 1998
Location: Waldorf Md. USA
Posts: 3,283
We did the same exact swap, except in a 86 Blazer. We used everything from the 305 and it ran great, even got better mileage than the 305. Everyone told us we would have to swap the prom in the ecm, but we decided to try it first the way it was. What a difference in power in that 5000lb "brick"
Hope this helps,

Bill Koustenis
Advanced Automotive Machine
Waldorf Md

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