Hello, I have been checking out this forum for sometime now
and have done quite a few searches but many things have confused me so here are my questions

first off I am rebuilding a 1979 350 for my Blazer and adding TBI which I am getting a complete set up off a 1987 Blazer

I want the engine to be as close to stock as I can due to
the budget I am running on and not wanting to spend the extra money on getting the hardware to burn my own chips of paying
to get them burnt..

With that said will the compression ratio effect the ECM in any way? if so how and what compression ratio can I safely run with out messing with ECM..

next for the Cam specs I have read in a few different places that
the max lift you can have is 440 the duration 260 and the lobe seperation angle can not be greater than 110. can anyone confirm this or recommend a good low end torque Camshaft that will not effect the ECM?

next for the ECM questions
Will the engine run decent with out the EGR? is the a way to bypass it?
will the engine run decent with the VSS un hooked until I can find a VSS speedo or can I leave it off?

next for the Fuel Questions
What would be the best pump for the setup factory or the holley
Blue with a regulator?

I'm sorry for all the questions for the fist time. I would appreciate Any input. and any advise that would help this swap go any easier this is my venture in to world of FI. So any tricks would be helpful also

Thanks

 

per the cam question i would call crane, comp or slp and tell them your setup see what they recommend then compare the cams, thats what i did and settled on the slp cam for a 305........

as for egr , your engine will probably run rich as hell without it but this could possibly be overcome, ill have to play around with it myself since the heads i want dont have egr provisions, the only way to bypass it is to have it removed from the chip


as for the vss......im not sure if it will effect the way the engine runs but i do know it may not be good for your tranny since it control some shift points..........


someone else im sure can add to these thoughts

 

EGR recirculates spent exhaust gasses back into the engine, allowing the ECM to add more timing by lowering combustion temps. leaving the EGR off without turing it off in the PROM will cause hp and MPG loss.

Do not run without your VSS. It controls shift points in the tranny. You will be looking at a rebuild soon if you do.

I've never heard of compression ratios affecting the ECM. As long as you keep it under 10:1 (and over 8.5:1) you will be able to run pump gas just fine.

 

I forgot to add that I would be using a "old style" th350
so I would not need the wires for the lock up converter
will that effect the VSS in anyway

Thanks for the help so far any more help will be appreciated

 

I'm just getting started with prom burning, and I've been running for a while with EGR disabled because the solenoid wasn't working.

I did some scanning, and I get a lot of knock in the range when the computer thought the EGR should be on. I disabled the EGR in the prom, and wow, the car runs great. No knock anywhere.

The ECM does use the VSS for things other than just the TCC lockup, so I'd definately get one.

So you might want to think about getting the prom burning stuff. There is tons of information at www.diy-efi.org. The most expensive part is the EEPROM programmer, $150 for the pocket programmer. The rest of the stuff can be found for cheap if you work at it (build your own cable, laptop from swap meet).

Regarding the cam, the prom guru's say that anything over 230* at .050" is hard to tune. Without doing any prom tuning, I'd guess you'd be restricted to about 200* at .050.

High lift won't bother the computer, but you're limited because of the short duration.