Cascade Crew

iansane · Posted: Sun Apr 02, 2006 11:38 pm Post subject: Vortec head swap?

Okay, now I'm talking about the 4.3's vortec heads and stuff. Does anyone have any info on them vs stock tbi heads? Beneficial? I thought I heard this at one point... I can get ahold of some basically free vortec heads with almost not miles on them. Would these be better than the stock heads on my 89 tbi motor?

Quasi-Traction · Posted: Sun Apr 02, 2006 11:43 pm Post subject:

I thought 4.3L were a V6...

iansane · Posted: Sun Apr 02, 2006 11:52 pm Post subject:

......they are Shocked

Xophertony · Posted: Sun Apr 02, 2006 11:54 pm Post subject:

doing a v6 swap ian?

iansane · Posted: Sun Apr 02, 2006 11:58 pm Post subject:

Yeah, I sold off all my v8 crap and have succumb to the genius design behind the tbi v6. I even traded the t56 straight up for a slipping powerglide. Man, did that guy get screwed! ha! Laughing

No, this is for my blazer! Very Happy

Ditching the IFS. I got my johnny joints in the mail so I can start on the long arms now.

aaron_sK · Posted: Mon Apr 03, 2006 12:19 pm Post subject:

As I was reading that first post, I kept thinking that the Vortecs were not going to work with your HSR.

Anyway: http://www.tbichips.com/truckmods.htm

The second article on that page makes some pretty bold claims about those TBI heads.

http://www.chevymania.com/tech/vortec.htm

Twilightoptics · Posted: Mon Apr 03, 2006 4:22 pm Post subject:

I did that swap. Nickel and dimed me to death. $250 intake, head work, $70 rocker studs, nuts bolts gaskets etc) Thinkg I had like $600 into it. Fuel pump couldn't keep up, needed TBI spring. Needed MAJOR tuning.

Worst swap I ever did. I put a V8 into an S10 and it was easier, and ran great lol.

I couldn't hardly get it to run it was so lean. I read this all with a wideband. Also, the TBI stuff doesn't log fast like the TPI stuff does. So you can't get accurate (what's going on at the time) info.

Goodluck. That's all I've got to say.

If I still had the rig and didn't do the swap, I'd think about a supercharger kit before I went with the vortec swap. BTW, it didn't feel like there was much more power, and my milage went down. Even after I had it tuned decently.

iansane · Posted: Mon Apr 03, 2006 9:06 pm Post subject:

I've got basically the whole upper end for $80 at the local pull-a-part. I thought about aport efi setup with the stock manifold drilled for injectors. Could a '749 ecm be able to control it since it controlled the sy/ty 4.3? Since it never saw boost it wouldn't matter about that kind of programming under boost, right?

Maybe I should just swap a v8 in. Laughing

Twilightoptics · Posted: Mon Apr 03, 2006 9:14 pm Post subject:

iansane · Posted: Mon Apr 03, 2006 10:06 pm Post subject:

The 749 is basically a 730 with a 2bar map and some other mild tweaks. I only mentioned it because I have one sitting here not being used. I've already wanted to do a multiport swap on it since it'll be my off camber wheeler.

I'm not sure how the 749 programs works but I figured it had separate tables for fuel/timing under boost? Confused

shizzle, I forgot already about the DS. Lemme go measure.

Twilightoptics · Posted: Tue Apr 04, 2006 9:00 am Post subject:

John might chime in about the 2 bar vs 1 bar.

The problem is the computer only reads the table so much. So wit hthe 2 bar, it cuts out alot of the non boosted table, so it can add cells for positive vacuum.

Dewey316 · Posted: Tue Apr 04, 2006 9:03 am Post subject:

The 749 should work with a 1bar map. I am not sure what mask you would need to run though. Since you can run it with TBI, or Port injection, I am sure there is a 1bar MAP setup that used the 749 computer. I would check on TGO for the posts about running a 749 with a 1bar MAP.