Go Back  Third Generation F-Body Message Boards > Tech Boards > Tech / General Engine
Reload this Page >

1984 firebird needs new heads any thoughts on replacements v8 305 4barrell carb

Tech / General Engine Is your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!

1984 firebird needs new heads any thoughts on replacements v8 305 4barrell carb

Old 01-28-2019, 09:23 PM
  #1  
Junior Member
Thread Starter
 
Join Date: Oct 2018
Posts: 11
1984 firebird needs new heads any thoughts on replacements v8 305 4barrell carb

Hey guys so after trying to troubleshoot my 1984 firebird, finally was told the heads where bad and I had low compression on 2 cylinders, I was looking for aftermarket heads that will be direct fit and give a little boost in horse power Iím in California so I need to be able to smog it but not sure where to start a shop was charging me 1000 to rebuild the heads but I think it will be better just to replace them, I am not looking for insane power just being able to drive it daily and maybe get up to 200 horse power any help will be appreciate it thanks
jesus9814 is offline  
Old 01-29-2019, 12:44 AM
  #2  
Senior Member
iTrader: (4)
 
punkmaster98's Avatar
 
Join Date: Aug 2011
Location: Manalapan, NJ
Posts: 828
Car: 1984 T/A
Engine: LQ4
Transmission: 4L60e
Axle/Gears: Ford 8.8 3.55 gears
Re: 1984 firebird needs new heads any thoughts on replacements v8 305 4barrell carb

For a little more money you can get a new L31 350 motor from summit
punkmaster98 is offline  
Old 01-29-2019, 08:06 AM
  #3  
Supreme Member
iTrader: (2)
 
Join Date: Jan 2005
Location: Hurst, Texas
Posts: 8,306
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: 1984 firebird needs new heads any thoughts on replacements v8 305 4barrell carb

Originally Posted by punkmaster98 View Post
For a little more money you can get a new L31 350 motor from summit
The L31 will not pass smog in California, but I bet if you put one of the 260 HP Goodwrench 350s in the car, bolted all the 305 parts back on it, it would be visually the same as the 305 and run clean enough to pass.
Fast355 is offline  
Old 01-29-2019, 08:23 AM
  #4  
Supreme Member
 
dmccain's Avatar
 
Join Date: Mar 2014
Location: South Ms
Posts: 2,862
Car: 89 Pontiac
Engine: 5.0 FI
Transmission: 700R4. Shift kit+S10 TC
Axle/Gears: 3.73s Posi
Re: 1984 firebird needs new heads any thoughts on replacements v8 305 4barrell carb

I agree with Fast355. The Goodwrench engine will have the same visual, pass inspection, smog test and I promise you it will be daylight and dark from that 305. I know people that have used this engine with a mild cam swap, they do pretty good, I would say it makes more like 215 hp in our cars though not the 260 rated. Buy the 190HP version cheaper and swap the cam.
dmccain is offline  
Old 01-29-2019, 08:54 AM
  #5  
Junior Member
Thread Starter
 
Join Date: Oct 2018
Posts: 11
Re: 1984 firebird needs new heads any thoughts on replacements v8 305 4barrell carb

Originally Posted by Fast355 View Post
The L31 will not pass smog in California, but I bet if you put one of the 260 HP Goodwrench 350s in the car, bolted all the 305 parts back on it, it would be visually the same as the 305 and run clean enough to pass.
so if I do the swap will I need other parts for it to work will the existing cpu work with the 350
jesus9814 is offline  
Old 01-29-2019, 10:26 AM
  #6  
Supreme Member
iTrader: (2)
 
Join Date: Jan 2005
Location: Hurst, Texas
Posts: 8,306
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: 1984 firebird needs new heads any thoughts on replacements v8 305 4barrell carb

Originally Posted by jesus9814 View Post

so if I do the swap will I need other parts for it to work will the existing cpu work with the 350
If you could find a 350 truck, van, suv or cop car with the CCC Q-Jet you can take the primary jets and metering rods. Then swap the rear metering rods to something richer like a DR. Grind the tab down on the secondaries to allow for more than 45% opening of the secondaries of the 305 carb. The computer on your car is very dumb and basic and will have no real issue running a 350 with a stock or even small cam.
Fast355 is offline  
Old 01-31-2019, 11:11 PM
  #7  
Member
iTrader: (1)
 
Join Date: Jun 2004
Location: Southern CA
Posts: 272
Car: 1984 Firebird Trans Am
Transmission: 700R4
Axle/Gears: 3.73 Posi
Re: 1984 firebird needs new heads any thoughts on replacements v8 305 4barrell carb

Originally Posted by jesus9814 View Post

so if I do the swap will I need other parts for it to work will the existing cpu work with the 350
If your original engine is the L69 High Output engine with a knock sensor, you will also need to swap in a 350 knock sensor and module. Everything else will work fine. You can tune the carb by swapping out secondary metering rods but that will only have an effect at full throttle. At part throttle the computer will compensate for the larger engine (unless your carb is really messed up).
Jaime-TA-84 is offline  
Old 02-01-2019, 08:20 AM
  #8  
Supreme Member
 
Join Date: Oct 2004
Location: Henrietta NY
Posts: 3,809
Car: 1984 Trans Am L69
Engine: 355 Carbed V8 Patriot Vortec Heads
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
Re: 1984 firebird needs new heads any thoughts on replacements v8 305 4barrell carb

You can get a set of heads fairly cheap remanufactured look around ebay or local shops.

https://www.ebay.com/itm/Cylinder-He...Ceqk:rk:6:pf:0
midias is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
'91CamaroRS
TBI
3
01-13-2016 11:36 PM
jizzo09
Body
1
12-15-2007 12:15 PM
mbrownone
Interior
1
09-28-2006 05:57 AM
formulafastfoot
Carburetors
13
07-30-2006 06:03 PM


Thread Tools
Search this Thread
Quick Reply: 1984 firebird needs new heads any thoughts on replacements v8 305 4barrell carb


Advertising
Featured Sponsors
Vendor Directory

Contact Us - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: