I read all the info in the stickies but i'm still confused.
I have a slew of questions I'll start by stating what i have, 83 z-28 crossfire
305, stock exhust, mild cam, tbi (swaped once allready), 2.73 gears, auto, POS performance wise
for a carb i have a avanti preped 650 dp and a torquer 2 intake
i will be upgrading my gears to 3.73 in the near future
questions:
1. can i use my distributer as is and just instal the carb and intake?
2.if i go with a external inline fuel pump will that run a tbi setup if i switch back to it again?
3. what if i put a pressure regulator in line to reduce the pressure to 5-8 psi instead of a regulator with a return line?
4. for tuning assuming i make it that far, whats the best approch the carb was from a 400 hp motor i have a POS. where do i start. will this carb and intake do me much good for my set up.
Most important for me is that i'm moving in less than 2 weeks and i need to get my car to drive 300 miles.
I have a slew of questions I'll start by stating what i have, 83 z-28 crossfire
305, stock exhust, mild cam, tbi (swaped once allready), 2.73 gears, auto, POS performance wise
for a carb i have a avanti preped 650 dp and a torquer 2 intake
i will be upgrading my gears to 3.73 in the near future
questions:
1. can i use my distributer as is and just instal the carb and intake?
2.if i go with a external inline fuel pump will that run a tbi setup if i switch back to it again?
3. what if i put a pressure regulator in line to reduce the pressure to 5-8 psi instead of a regulator with a return line?
4. for tuning assuming i make it that far, whats the best approch the carb was from a 400 hp motor i have a POS. where do i start. will this carb and intake do me much good for my set up.
Most important for me is that i'm moving in less than 2 weeks and i need to get my car to drive 300 miles.
five7kid
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May 4, 2026
From the top:
The intake is a mismatch. You've got a low-RPM cam, that intake doesn't "come in" until 2500 RPMs - half-way to your redline. Sell or trade it for a dual plane intake like the Performer.
The 650 DP is a little large for a stock 305 and stock torque converter. But, it won't cause major problems.
By the numbers:
1. The stock distributor advances the timing based on commands from the ECM. Unless you maintain all of the sensors, including the throttle position sensor, the ECM won't know what to tell the distributor, and you'll be limited to very little advance. The best bet is to get a vacuum/mechanical advance distributor.
2. An in-line electric will supply a TBI, as long as you select the right one. I assume you plan on dropping the tank and removing the in-tank pump (if you weren't, do it).
3. You can use a dead-head reg as long as the electric pump is designed to take it. Most in-line pumps will. A factory in-tank will not - it needs the return.
4. That carb and intake will run (along with the afore-mentioned vacuum/mechancial advance distributor). It won't be optimal, but it will run. You can use the stock distributor to get it running, but don't plan on getting very good gas mileage in that 300 mile move.
The intake is a mismatch. You've got a low-RPM cam, that intake doesn't "come in" until 2500 RPMs - half-way to your redline. Sell or trade it for a dual plane intake like the Performer.
The 650 DP is a little large for a stock 305 and stock torque converter. But, it won't cause major problems.
By the numbers:
1. The stock distributor advances the timing based on commands from the ECM. Unless you maintain all of the sensors, including the throttle position sensor, the ECM won't know what to tell the distributor, and you'll be limited to very little advance. The best bet is to get a vacuum/mechanical advance distributor.
2. An in-line electric will supply a TBI, as long as you select the right one. I assume you plan on dropping the tank and removing the in-tank pump (if you weren't, do it).
3. You can use a dead-head reg as long as the electric pump is designed to take it. Most in-line pumps will. A factory in-tank will not - it needs the return.
4. That carb and intake will run (along with the afore-mentioned vacuum/mechancial advance distributor). It won't be optimal, but it will run. You can use the stock distributor to get it running, but don't plan on getting very good gas mileage in that 300 mile move.
so i've got lots to learn, sounds like i'll be busy. Thanks for the input
Senior Member
Quote:
Swim500in5,Originally Posted by Swim500in5
I'll start by stating what i have, 83 z-28 crossfire You have a very unique vehicle. The cross-fire Z-28 (although no tireburning powerhouse) is becoming harder and harder to find. Sure they built quite a few of them but just try and find one for sale. There are several folks who claim to be able to coax a great deal of performance out of the Cross-Fire. You might consider looking for some of those folks around here.
I sure wish the previous owner of my son's car had retained the original Cross-Fire. If I ever get a chance to buy one I'll be putting it back on there and throwing the carb and intake in the corner.
IMPO - If you decide to make the change..... save all the Cross-fire parts in some corner of your garage. Someday, you may be more interested in Restoration rather than Racing. In addition, if you ever decide to sell the car some folks will dish out a bunch of extra $$$$ if those Original Equipment Parts are sitting in the trunk.
Sincerely,
Kurt
Too late for that, I sold my complete crossfire to a guy in canada for $250. I though it was a fair trade. ITs still a cross fire car with the cross fire hood and what not. could easily be put back. I'm not totally into racing I just want a car that runs. Anyways if I had to do it all over again I would never have bought the car in the first place I got taken on the purchase price. Car was a pile. So much for the honest christan lawyer friends of the family. once a lawyer always a criminal. It was totaly stock when i got it besides the swamp and rusty floor pan it would have made a good resotration project.
too late now
too late now