GTARob

I have a 1989 GTA Trans Am. The motor was a 305-TPI with a 5spd. To make a long story short the motor spun a bearing and I have decided to swap to a 350. Here is the plan so far..
I am having a 350 built with the usual low end stuff...forged pistons, factory rods and sealed power bearings. My machinist has suggested using the stock 305 heads to push up the compression. We have talked about keeping the cam just a step above mild. (I am not sure of the exact numbers on it yet.) It will be a lunati full roller cam and valve train. The lower intake is going to be port matched to the heads and I am getting the TPIS runners. I am sticking with the stock throttle body, but I am going up to SVO 30lbs p/hr injectors. I have been looking over everyones postings and have garnered the following info regarding the ECM.

I can still use the stock computer and chip, although having a custom burned chip is something to look to in the future. I will need to replace the knock sensor for one off of a 350 motor. Do I still need to replace the ESC or is that part of the ECM? If not then will an MSD 6a unit work in its place? Is going with a later model speed density setup better and what would be involved to do it. Parts and Cost.

If I have missed anything please let me know and your suggestions and advice are welcome. This is my first FI car most of my expeirience comes from 2nd gen birds.



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1989 GTA TRANS AM
305 TPI, 5 SPD
SWAPPING TO TPI 350 NEXT MONTH.

Mark_ZZ3

30lb is rather large for stock setup (and for the prom too). You will need to lower your fuel pressure quite a bit to get it to idle decent. Stock 22lb injectors will support a decent engine.

305 heads will give you more compression, but the intake ports are rather small for any big hp. Although it should have big torque right around 3000 rpm.

My 2 cents.
Mark.