When we started this change over truck had a Phatom Grill and a lot of custom work and only a 4.3 z motor, TBI ECU is listed as: Service # 16168625 BBMW 86BBMWK330491987, reference info if needed. $E6 16168625 93 C/K Truck, Van, 4.3L, 5.0L & 5.7L

Did not know and was not told a B.B. TBI was an option, but Turbo City did say they could modify TBI sticks a little when pushing on it though. ANYWAY, we had hoped to build this 5.7 4 bolt main with 2.02-1.60 Pro 67 Torker Heads, which instead we got stuck with 76 cc heads as stock SR told they were Torker's, 1.94-1.5 valves, with F.M. H345NP40 pistons. Comp Cam 212-218 444 lift, Rocker 1.6 Rollers. Balanced, after ARP rod bolts and resizing rods, but We use TBI manifold from Edelbrock 3701, which I am selling now. I got maker of heads to replace heads and promised to ship them immediately, which they did ship BARE heads.

We are re-considering since disabled, to use 76 cc heads with .015 gaskets and shaving heads .020 to up compression for now. NO smog, but we were not sure about EGR and ECM after we change out all MAP, Knock etc to 5.7 and it seemed to run rich. "Custom Chip" Turbo made and PROM from GMC matched to truck except 5.7 not 4.3 all ran very rich, enough to put a black ring on ground, waste gas etc. WE notice a little white smoke after black smoked cleared after awhilel and became worried about leak and pulled heads off when I found cc issue as when sick I did not put together and stock heads, which suck as I had these already with valve job and double springs etc. ANYWAY, sorry little frustrated, we had a heck of a time pulling one head from carbon, I assume, was build up in heads and on top of pistons 9800 miles only, moly rings and HYP pistons seems in good shape otherwise. Compression on gauge before it broke was only 122-125 but steady on all cylinders, we assumed another reason to check motor as vaccum seem to drop from 15 lbs to 12 at idle we assumed low compression, cam and vaccum was throwing computer into thinking it was under a load thus fuel problems etc. After pulling heads maybe wondering if other issues as carbon was terrible, took pictures before and after cleaning build up on piston's top and head chambers etc.

WE have been looking at winALDL, TCCat sites etc on how to make our own chip after the not so great experience so far. We also were told a injector spacer such as cfm-tech.com would allow TBI to pull air from either side, never liked 180 manifolds, injector spacer may up Turbo's modified TBI that is suppose to be 590 CFM some to say 600 CFM, which we use to run a 650 carb on a 350 plus Pontiac 400, it seemed ok.

Can you use and tune TBI's to run better and allow more cam options then stock cams as Some TBI cams suck, in my opion. I was told a 112-114 CL was needed and no more then 210 duration, would of liked a little more duration and around 480 of so lift, hydraulic, as changing cams is less expensive this way for now. Later, we hoped to go to a 383, but health and wrong heads held me up. We wrote Pro about heads as they were to replace 217s sold to us as 67 cc torkers, but with out valve etc, cost is more then I have right now as I try to fix truck to move out of filed before bad weather, tornadoes etc in OK come.

I also have the 4L60E transmission which is in good shape, but we had hoped a TBI system could be modified to run and with a little better cam choices then performer cams etc without thowing computer into thinking it's under a load. I was tempted to get 750 Holley and Dominator down the street for 125.00, but I am told TBI's can get better mileage and work better then mine has so far and asking for any help in this area and if it's possible? :hail: Help as I try to catch up with new technology and gain HP. For the records, it's ran rich and little white smoked when black smoke cleared showed up after 3000 mile drive across US very light but a concern, MANIFOLD GASKET? 65 Police injectors! (Tach is off about 25% from change over from 4.3-5.7!)

 

I ran a 110 CL Comp 270.
224 @ .050, TBI.

Takes some effort, so lots of the commercial guys, whine and say it can't be done.

Start reading, and taking notes. Kind of a steep learning curve when your starting out.

 

That sounds cool, and I have been reading and there is a lot to read. I guess you need a cable to read program and start looking at options, contacted a few from sites listed here, which in themselves had a lot to comprehend.

I like the cam you used as XE and even Summit has some nice cams, Hydraulics, seem very reasonable, not sure who does their cam grinding. Something close to a RPM or 270 cam and with some real lift would be good and cool for now.

Thanks, it's a class study in it's self, but I do not see any other way to really get what I want then to try. Craig M, winALDL and other sites, tccat did mentioned my ECM and not sure about winALDL yet. I figured learn on 350 before I try doing more to 350, stroker etc!

270 Duration with a 110 CL, lot more then I can run now cool, :hail:

Even a Xtreme XE262 or 268H, guess General Kinetics went out of business, been awhile since in HP cars, May look at Crane, Seg, Isky or even Crowler if this happens would be cool!

Xtreme/Magnum/HE cam?

Thanks again:

 

1993GMCPU, you must have good learning skills, your last post is the first one I've been able to understand sence you first started posting.

Steve

 

Your in a big ugly heavy truck, like me, My setups in my sig, it runs well with good low end power, I give that credit to my cam with a 114 lsa, any smaller, and you'll have a motor thats a bit of a dog under 2000 rpm.

 

I seen a few 112-114 CL cams that may work, sounds like you found a nice cam, big truck ugly, not really,

Just truck looks nice boyd rims, stull phaton grill and wanted to match motor to what truck looks like. Thanks as there a lot of cams out there and some can be gotten with 112-114 CL's and believe Grumpy on other site said some custom 110 can be ground with 112. Wanting more lift and cool little lope, depends on what I can do with chips etc as I try to learn.

Upping compression some and trying to get Pro to send valve kit for heads they sent to replace 217 with wrong cc or mill 217s and use Fel Pro 1094 head gasket to get 40 quench and around 9.0:1 to 9.6:1 compression estimately. 217 have 1.94s and Bare Torker's come with 2.02s, well when you get them not BARE! Sorry, it's been a pain to get the heads I was told I had bought when T.C. made chip. Again, thank you for your time and input! Crane and Comp have a few grinds that may work, not sure about Isky or Seg cams yet.

Turbo City said CFM with out injector spacer is only around 590 CFM with flow matched 68 injectors, but then again, when we started this we planned on Pro's Torker heads with more flow then 217.

Sorry about any other posts and my year of stress with heads, illness and deaths in family got the best of me, and I hope post improve as well as my learning curve on chip improvements at 50 dollars a change by T.C. when first chips seem not to work, I figured I may as well try.

Will look at 3.73 rear gears later as well and if it does not flow well, go to a 3.75 grank and pistons later once I get some miles on 350 40 over motor, 9800 miles now. Son's 383 in 66 Impala, smokes them at 55 mph, With hassles and problems I had with HP parts if I had a non-electric over drive trany, I would probally bought neigbor's Dominator and Holley 750 Double pumper and sold one of my two Proform Electronic distributors as well as TBI Manifold, Edelbrock 3701!

 

check comp cams for trucks with computers. seems they have more options.

 

Hey GMC, sorry about the jab at your posts. They just seemed so hard to decifer sometimes. My apologies.

Steve

 

It was just a bad year last year for things that caught up with me and just thought it may help others understand my confusion.

NO PROBLEMS, just to clear up issues as HP, GAS etc these days is all higher, and more work and at time, I was very very upset and frustrated, thanks for the comment, It's really appreciate!

Hate to see anyone get the run around or sold wrong items and I guess it just got the best of me, thanks though! Tired now, so excuse haste but not interest and appreciation!