I have a 1985 Z28, it has a 305 TPI and I'm going to replace it with a 327
Can I use my old heads and intake on the 327? And keep it fuel injected. I was told that I could. Will that cut down on my Hp? What effects will this have. Or should I just keep the 327 carburated? What is my best option and still have the maximum HP

 

well im NO fan of TPI period. that being said, the 305 heads will most def. choke the 327, and then the tpi will choke it further. fine if all you care about is low end torque. but if you want to rev to 6K rpm, forget the tpi. and forget the 305 heads. if your on an extreme budget, and cant afford the new heads/intake/carb conversion, it will work. but thats not the best option at all. I went carb'd 350 in my 86. it is a night and day difference. a torkerII intake will clear the hood (barely) with either a edelbrok proflow air filter, or a drop base 14" cleaner. if you go carb'd, dont forget you gotta modify the fuel system too. mallory 4 port return style fuel regulator and use the low press. spring. dont forget a distributer/ign. system.

 

are you trying to fit it under the stock Iroc hood? as I said the torker II is a great across the rpm band intake that has a low carb mount/flange. if your getting a cowl hood, then your open to whatever intake you want. the rpm air gap is in my opinion the best all around intake you can get. but its a good 2" taller then the torkerII, and 2.5 times the cost.

demon, proform, holley HP, all great carbs that should be a pretty good match right out of the box. the carb and intake selection will need to match the rest of the combo though to get the most potential out of the least money, and have the best driveability. Im goin to assume your goin to get long tube headers, aftermarket exh. system, 3:42 or 3:73 rear end gearing, stock auto overdrive trans right? Id go for the torker II and a demon 750 mech. secondaries. or rpm air gap IF your getting a cowl ind. hood.

whats the cam specs in that engine? and what heads? compression?

 

No its not a stock hood, its the daytona cowl hood so i have the clearance for many options. I have no idea all the specs right now like I said this was given to me by my uncle, the only thing I know right now is that it has alot of torque and when it was in the dyno it has 390hp. Yes long tube headers and exh. The trans is stock but has a kit in it, and that is going to be rebuilt as well.

 

Also can anyone tell me what rear end gears I should go with? 3:73, 4:11???

 

3:73 if street car. 4:10 if track mostly car. or, all out street car and not worried bout freeway driving/gas mileage. best bet would also be 3500-4000 stall conv. depending on the cam.

 

I'd like to have a combination of both, I want something that will perform both places, but it will be mostly street, I want something that will throw your head into the seat and still have alot of top end for the track. I'm kinda leaning to the 4:10's... Is there a in between size?? I really don't mean to sound stupid with all this, but all this is a new experience, and I value all the imput I recieve.

 

The only thing that I can find right now is a Mallory high pressure 5 port return style reg. Now I found a Magna fuel low pressure 4 port reg. I'm assuming that will work as well? Now onto the distributer/ign system... I was told that I can use my old dist? I have an ACCEL HEI In-Cap Super Coil installed as well. Does any of this sh-t make any sense to you??

 

your old dist. from the tpi? NO. you cant. you can use the cap I believe, but Id dump all that stuff and get an MSD full setup. (thats what I did. ) the TPI dist. is computer controled (advance) you need an old school mech. advance distributer. and while your replacing it, get a small cap distributer for space reasons. fits much better.

the mallory 5 port reg. is the one I have. and the one I put in a customers car that I also went carb in. and the one I told my buddy to get when he did his carb. conversion in his vette. it will come with 2 springs. one is high press (adj. from like 30-55lbs ish) and a low press. spring (adj. from 0-13lbs ).

not sure, but if the magna fuel reg. is return style, then yes you can use it.

 

Great thanks!!!!!!!

 

Ok, now another question... I know you probably think I'm a dumb a$$, but about this fuel reg, does this mean that I don't have to pull the elec fuel pump thats in the tank? This will give me enough fuel pressure to pull through the old pump?? And this is going to mount where? (on motor, in-line with the fuel line) I need all the help I can get!!!

 

you still use the orig. fuel pump. no other pump needed. you can cut the stock steel pipe where it turns up and goes into the braided line. cut off the fitting, or just slip the rubber fuel line over that. use a short piece of fuel hose to connect right to the regulator that you'll mount in the left front corner. the return line comes out the bottom if I remember right. then from the output of the regulator over to the carb. I'll see if I can dig up a bad pic maybe.

 

here's a pic of how I did someones car just like your doin. this is a fourth gen, but same thing. cut the steel fuel line, slip rubber hose over line, and route to inlet of regulator. I used double clamps over the cut steel lines, since there's not flare to positivly hold the line on there. but dont worry, it'll be low press. so it wont come off if you have a couple inch's of hose on the pipe and its tight.

 

Thanks again, if I have anymore issues, I'll be sure to get in touch!!

 

What did you do with all the extra wiring? Did you just keep it there, or eliminate the stuff you didn't need? And also do you have to get all new gagues, or will all the stock ones work?