txgt said:
What all did you have to modify and with what? From what I could see you did the following(correct me if I'm wrong):
-Shaved the engine mount bracket to connect it.
-Used the 3.0 Alt & AC brackets
-Used 72 upper intake plenum(why not the 75 fitment issues?)
-How did you increase the header length? Would you recommend 75 headers over any 72 setup? If so, then club4G has some cheap 300-500 dollar headers I recall.
-How did you get the dizzy setup? Did you transfer over the 3.0 heads or did you keep the 3.8 heads but replace just the covers with the stock 3.0's? Did you have to build a bracket to connect the dizzy to the rear cam sensor?
-You used the 74(3.5L) coolant pipe.
-Did you just change the injector size with ecutune or did you manually update the ROM?
Sorry about the long list. This is something I've been thinking about doing and it seems everyone and their mom has their own method of getting this done. I have a 3.5L in storage and if I can just transfer parts that'd be awesome savings for me.
Maybe, you should make your own garage section tutorial lol.
Overall, my goal is to fix up the 3G to get it reliable and on a good platform even if it's on a non-mivec rather than paying close to 30k for another car.
if you read my thread and the 3.8 swap thread you can get alot of the information. if you don't mind, I would like to post your question in my thread.
1. Get a 6g75
2. Get a 6g74 (3.5l diamante) water manifold and heater pipes.
3. Strip all brakets off
4. Remove the plug in the back of the head where dizzy is on a 3.0. Save the bolts to bolt the dizzy on.
5. Remove the cam sensor off the front head and replace with the 72 plug. Then bolt up the water manifold.
6. Get an alt bracket from a 74 or shave a 72 off at an angle to tip the alt bolt hole down.
7. Bolt on the 72 engine mount at fit the altenator
8. Shave the bolt bosses that interfere with the 72 a/c bracket.
9. Remove the the timing covers and the tensioner and belt. Remove the lower gear and crank sensor. Replace with the 72 parts. Order a new belt! I got a Dayco belt from Advance Auto for $27.
10. Carefully line up the timing marks and install the belt. Put the tension damper in a vice and slowly compress. Use a small nail to hold it compressed. Install it and pull the nail. double check timing marks and install timing covers.
11. Use the 75 or 74 upper power steering bracket with the lower 72 one and belt tensioner.
12. Use the 72 flywheel.
13. Modify the fuel rail to use your fpr and return system. I used the front half of a 72 rail and coupled it to the rear 75 rail. You could use a 74 fuel rail in place as I am told.
14. Grind the axle mount flat. Grind slowly and check often with a straight edge. Or you can use a Diamante mid shaft and bearing. Grinding is cheaper.
*I have not installed the 75 uim because the throttle body does not fit. The tp sensor hits the intake. I figure this could be remedied with a throttle body spacer of about 3/4". I have not got this far yet. It is in the works during my spare time.
*I currently have the computer flashed to scale the injectors at 305cc and I have advanced the timing 3* across the board. Continuing to tune everyday.
I also have spent the money for AEM cam gears.