Hey Guys.
I got a 85 tpi out of a corvette. I got the whole engine and I'm putting it in my 91 z28. If I take everything off my 305 tpi the sensors off the tpi intake and everything will everything just bolt in and work? Since I have it out what would be a good cam to upgrade to?
Any pointers and help that would cause me to get over any trouble of getting it in and running right?

 

The TPI out of the corvette is identical to the TPI on your Z28 except the fuel rail comes out on the passenger side instead of the drivers side and it will be MAF while your Z will be a Speed Density set up. There is zero reason to swap them unless yours is broken and unfixable somehow.

 

Yeah the 305 is crap. It through a rod bearing and he cylinder walls are shot to hell and I don't feel like paying to get it fixed when I could get the same exact motor but a 350 and use my fuel rail. I've been told it just have mounting bolts missing

 

It will bolt in just fine. I would actually keep your ECM and sensors from the 91, and just move the manifold and fuel rails over with the new motor and the 350 knock sensor. The only other difference will be a slight tune that you'll have to do with the newer bigger motor since your ECM is expecting a 305.

 

I was told that the 85 corvette was a flat tappet cam not roller? Is that true?
Also told the 4 center holes on the intake are different directions than the 91?

 

The roller motors weren't common in cars until 86. It's fine though to be honest, especially if the motor is broke in. I'm not familar enough with the intakes to answer the question about the bolt holes.

 

Would you know what I can do to change my distributor out of my 91 305 tpi roller engine to use in this engine or would I have to get a new distributor?

 

No difference. If you were going from an 85 motor into a 91 motor you would need a different gear but since your car is newer, no issues.

 

how much did you pay for the vette engine?

 

Getting it for $750. Has 50k original miles on. So I think it's a pretty good deal. Plan on putting in a better cam and servicing the motor before dropping it in. I just need help choosing a good cam

 

So I wouldn't need to change the gears in the 91 distributor from roller to a flat tappet cam?

 

I would say no. You need a harder gear for the roller cams because of how they're made. If you want, you can swap the gear on the bottom of your distributor to the one from the Corvette if you want.

As for a CAM, I'd look at a Lunati 60102 or 60103 (Those are the old numbers but they still pull up on Lunati's site) or equivilent flat tappet cam. It would be a good place to start anyway. Also remember, when talking to the CAM company, they will ALWAYS say their cam is the best for your application.

 

Those are for flat tappet cams? Does it require changing anything else, lifters, springs?
Yeah I was thinking of calling summit and asking them what they recommend but I don't want them to recommend a 500 dollar can lol

 

You will need to use the flex plate from the 85, the intake manifold and fuel rails , plenum and runners from the 91 and distributor. The small cap hei has a melonized gear and not swap with a hei coil in cap. Contact southbayfuelinjectors to get new 22#hr injectors. If you need a tune send me a pm

 

So I have the intake manifold from the 85, and the flex plate. The fuel rail from the 91 wont fit into the 85 intake manifold? So u r saying I can't take the gear off the 85 distributor and put it on my 91 distributor? Is there a certain gear or something that would work you could recommend?
A tune, a chip?

 

You can use the small cap distributor as is but will need to grind a u shape for the coil mounting bracket to fit on the 85 intake. The 91 plenum and runners and fuel rail are a direct bolt on.Althogh the 91 had a roller cam and melodized gear it will work on a flat tappet cam. The large cap and small cap shafts are different diameters.
http://parts-catalog.acdelco.com/cat...&parttype=2486


The 85 hei coil in cap will work as well if you install the correct connecter
http://www.ebay.com/itm/Weather-Pack-Delphi-Packard-4-Way-Kit-Flat/110458774508?_trksid=p2045573.c100033.m2042&_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D28797%26meid%3D48eb27d2826045f39bae3546ded69141%26pid%3D100033%26rk%3D1%26rkt%3D4%26sd%3D110458774508

The 85 knock sensor is 100 ohms and can work if you keep the 85 esc module and rewire it to the 91 1227730 ecm . The 90-92 uses 3.9K ohm knock sensor. your 305 memcal can be reprogramed to work with the use of your old 305 knock sensor but will not be accurate. To make knock retard function you would need a gm 16151348 code aujp memcal and applicable knock sensor for a 90-92 tpi 350.

 

The stock exhaust manifolds will fit?? as far as I know that engine has angled spark plugs.

 

The manifold will fit, you should instal gaskets between the head and exhaust manifold. The manifold mating surface warps over time and one disturbed doesn't like to seal without a gasket to take up thee never mating surface.