65mm TB's for cheap

sleight · Posted: Thu Jul 17, 2008 8:06 pm Post subject:

Great. That'll give me time to round up everything else anyway.

wasas9 · Posted: Sat Jul 19, 2008 8:54 am Post subject:

That 3.5 DOHC TB looks awfully close in bolt pattern to the TB from the 4.3 L vortec engine.

If they have the same pattern, I'd like one to fit up to a 3500 plenum.

forced_firebird · Posted: Sat Jul 19, 2008 9:02 am Post subject:

wasas9 · Posted: Sat Jul 19, 2008 9:06 am Post subject:

weston19 · Posted: Sat Jul 19, 2008 11:40 am Post subject:

After the 2nd of augest i'll be ordering mine, do you think you will have some more sets by that time?

Im looking at the 3400/3500 ones..... Thnx mang

forced_firebird · Posted: Sat Jul 19, 2008 12:47 pm Post subject:

Weston19, do you mean to adapt the 3400 TB to a 3500?

wasas9, sorry, but the adapter would have to be re-designed to work with the 70mm. The IAC port is much larger, and the entire adapter would need to be widened.

isaachayes · Posted: Sat Jul 19, 2008 12:49 pm Post subject:

Plus I think the bolt pattern is different. Same 3 bolts but the top one on the vortec is more centered between the 2 bottom from what I could tell when I looked into it.

forced_firebird · Posted: Sat Jul 19, 2008 1:10 pm Post subject:

wasas9 · Posted: Sat Jul 19, 2008 4:28 pm Post subject:

weston19 · Posted: Sun Jul 20, 2008 11:41 am Post subject:

forced_firebird · Posted: Sun Jul 20, 2008 3:32 pm Post subject:

fallenz24 · Posted: Sun Jul 20, 2008 11:24 pm Post subject:

isaachayes · Posted: Mon Jul 21, 2008 1:24 am Post subject:

I see. WOT has the adapter for using the 56mm on the 3500. That's what I have on my car currently (well actually a 52mm now). It has the top tapped for the stock bracket.

So the 2 holes for the 56mm TB go through the adapter to the manifold without modifying anything? Neat. I bet then you could just bolt up the 56mm TB right to the manifold itself then, cable bracket issues aside.

My TB and adapter showed up this weekend. I had a spare air cleaner tube and had to work it on there with some force. I also cleaned it up and got it looking good. Not sure if I will leave it like that or paint it black or maybe a dark silver.

After work tomorrow I will pick up a LX5 gasket and if it's not too late mock it up on the car without the cable bracket (its coming to me in the mail). I'll check out TPS, IAC, (both look just like the other 3x00's) and fitment with the air cleaner tube and anything else. I'll probably turn the car on and rev it a few times and see how it sounds and responds to the more air per TPS position.

Hopefully my hood clears it and everything else, and the cable bracket mods easily and works without much issue. I've been trying to get a silly larger TB on my car for more than a year now with no success! LOL

Here is a pic of the TB you saw earlier in the thread, now in my hands. Notice it says MPFI on it?? WTF

Is the LX5 DOHC motor MPFI?

Then there is a pic after I cleaned it up.

isaachayes · Posted: Mon Jul 21, 2008 8:21 pm Post subject:

Stopped by to get a gasket but they had to order in. Then I looked online and called back to get them to order the right one.

The correct P/N is:
ROL: CM55567
Fel-Pro: 61304

The other P/N's that come up are a rubber o-ring for some other part of the intake. Apparently stock TB bolts up to an adapter and uses a paper gasket (what we need) and then the adapter bolts up with an o-ring to the intake manifold.

Oddly on OReilly's site they list the CM55567 as "EXHAUST ACCESSORIES - TBI GASKET (02-99 OLDS 3.5L)".... LOL

exhaust accessory? No wonder the parts guy didn't see it as a selection. Ordering by part numbers FTW!

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