Silly Questions

[lakedrifter]

I thought every state had to run EGR? This will be a daily driver.

[Fast355]

I thought every state had to run EGR? This will be a daily driver.

Techically it is a federal law. That being said my Marine intake on my L31 Express lacks EGR.

[lakedrifter]

Techically it is a federal law. That being said my Marine intake on my L31 Express lacks EGR.

;) Id get caught, lol. I think I can make the 92 intake work. I have my 305 marine on the stand and will use it to mock up what I need to do on the intake using that as a guide. slow and steady wins the race:)

On another note, I think I'll leave my 700r4 hooked up the way it is for now as well. I read the 700r4 lockup rewire thread. haha that was a lot to take in.

[lionelhutz]

You're not supposed to remove it but depending where you are depends on getting caught or not. Some states do no emissions checking at all and other states have regular visual and tail pipe and/or ODBII port checks.

[lakedrifter]

So what would omitting the EGR involve? If it saves me some work or money. who knows.

[lionelhutz]

Basically you just turn it off when you're creating a new bin file.

[lakedrifter]

Block off plate and turn off the egr in the ecm. Got it..

[lakedrifter]

Will the heads bolt on from a 92 Chevy G20 so I can use the intake without having to fix the 4 center bolts?

[Fast355]

Will the heads bolt on from a 92 Chevy G20 so I can use the intake without having to fix the 4 center bolts?

If they are from a 350 and you currently have a 305, you will lose about 1/2 to 1 full point of compression depending on if you have 53cc 601 heads or 58cc 416 heads currently on your 305. The TBI 350 heads are 65.3cc chambers. Other than that they will bolt on just fine. You would also need the self aligning rocker arms and valve covers off the 92 van.

At that point you might as well grab the whole 350, provided that is not why the van was in the wrecking yard and it is clean inside.

[lakedrifter]

I think I'm just going to try getting the intake to work on my set up first. I'f I fail then I can go grab a set of 305 heads that will work and another intake.

I'm still on a budget and I need a rear end more then the 350 at the moment. I've been chasing a ghost vibration that sounds like a cattle guard at 50/70mph. Whatever it is its finally starting to show its face, so maybe I'll find it this evening. If it is the rear end that 92' has one in it, I'm just not sure if the Gearing is different and what it will effect.

[lakedrifter]

Hey Guys, I hope everyone is doing well. I'm back with more silly questions lol.

So I scored a Chevy 5.7 TBI, wiring harness (24/32 pin) and 700r4 tranny in a "horse trade". (No ECM, UGGGGGHHH!!!)

I've been trying to figure out as much as I can on it, because I removed it from only the frame. The cab and bed had been removed and the engine and tranny were covered with a tarp. So no VIN.

What I know.
1) Supposedly it was an 89 Chevy with a 5.7.
2) The lug pattern was 6 bolt, I believe this would make it a C2500.
3) The Transmission serial number shows it to be a 700r4/4L60 built in 1987.

I can't really afford to jump into tuning and such and I just want to get my van to run a little better. A little more efficiently would be great. Quadrajets are a love hate relationship, and recently it seems more of hate than love. lol

I have most of the Mechanical worked out for this swap, but I am struggling with the ECM. The book shows 1227747 or a 1228747. From what I can tell it looks like it should have been a 1228747 because it is a 5.7. The wiring diagrams I research from here for the 2 look identical to me, but I haven't gone through them with a finer tooth comb yet. As for the EPROM "code" I certainly don't have a clue as to what it might be.

Can someone help with other identifying factors that would help reverse engineer my Frankenstein?

[fastacton]

I'd think it's more likely that it had the 7747. As far as harnesses go, you can use either ECM (plus a couple others), but the 7747 is more widely used and I'm not sure that the '8747 was ever used with the 700R4.

[lakedrifter]

I'd think it's more likely that it had the 7747. As far as harnesses go, you can use either ECM (plus a couple others), but the 7747 is more widely used and I'm not sure that the '8747 was ever used with the 700R4.

The ECM should be fairly easy to find, our wrench apart is full of TBIs, with that being said, finding one with the right chip;) thats another story. The original wiring harness I pulled was from a 1992 g20 but some one had already pulled the ECM. According to the 1227747 info page I need either an AMUR or a AYUB.

[fastacton]

ASDU is normally recommended as a starter for a 5.7/700R4 application when using the '7747. It's the most mature of the factory tunes.

[lakedrifter]

ASDU is normally recommended as a starter for a 5.7/700R4 application when using the '7747. It's the most mature of the factory tunes.

Thanks fastacton... I'll add that to my list. I'm head to the JY this saturday.