305 upgrade cam, heads, base, etc... ???
Thread Starter
Joined: Feb 2003
Posts: 2,498
Likes: 20
From: PNW
Car: 91 Black Formula KR
Engine: 305 TPI R69/G92
Transmission: Astro A5-Pro 5.0-McCleod
Axle/Gears: US Gear 3.42 Eaton True Trac
305 upgrade cam, heads, base, etc... ???
Ok, 91 305 TPI....
I got some nice parts, was considering doing a 383 upgrade, but kept seeing more $$$ for that...
my 305 has 150k, but in good shape, get new timing chain, etc... This way I can put most of these parts to good use and give my 305 a bit more pep
My mechanic said he would change cam and heads for $550... I got some parts I can sell to pay for that...
Install List:
Cam 260 XFI Comp Cams
Trick Flow 175cc 23 heads
The cam is .5+ lift and the heads can handle .6...
I have 2 intakes... A new Edelbrock TPI (in the box) and a GM one that was ported and extrude honed.
Probably sell the Edelbrock...
AS&M Runners
Ported Plenum
24 lbs injectors should do ?
Timing Chain
New Hydraulic Lifters
1.6 Rockers
Any other parts I should need / replace (water pump was recently done)...
Have EBL P4, so can be tuned...
Any thoughts about this? Do's or Don'ts ??
Thanks,
Rafael
I got some nice parts, was considering doing a 383 upgrade, but kept seeing more $$$ for that...
my 305 has 150k, but in good shape, get new timing chain, etc... This way I can put most of these parts to good use and give my 305 a bit more pep
My mechanic said he would change cam and heads for $550... I got some parts I can sell to pay for that...
Install List:
Cam 260 XFI Comp Cams
Trick Flow 175cc 23 heads
The cam is .5+ lift and the heads can handle .6...
I have 2 intakes... A new Edelbrock TPI (in the box) and a GM one that was ported and extrude honed.
Probably sell the Edelbrock...
AS&M Runners
Ported Plenum
24 lbs injectors should do ?
Timing Chain
New Hydraulic Lifters
1.6 Rockers
Any other parts I should need / replace (water pump was recently done)...
Have EBL P4, so can be tuned...
Any thoughts about this? Do's or Don'ts ??
Thanks,
Rafael
Joined: Sep 2000
Posts: 2,504
Likes: 195
From: Moorpark, CA
Car: '91 GTA, '92 T/A Convertible
Engine: GTA: 350 w/Vortec heads, T/A: 305
Transmission: Pro-built 700R4
Axle/Gears: GTA: 3.27, T/A: 2.73
Re: 305 upgrade cam, heads, base, etc... ???
If you are looking for injectors, I saw this today:
https://www.thirdgen.org/forums/engi...bosch-3-a.html
They're not 24 lbs injectors, but IMO I think 24's are a bit much for a 305.
https://www.thirdgen.org/forums/engi...bosch-3-a.html
They're not 24 lbs injectors, but IMO I think 24's are a bit much for a 305.
Junior Member
iTrader: (3)
Joined: Oct 2014
Posts: 44
Likes: 0
From: Indianapolis, IN
Car: '88 GTA
Engine: 350 TPI
Transmission: 700R4
Axle/Gears: 3.27
Re: 305 upgrade cam, heads, base, etc... ???
If you are looking for injectors, I saw this today:
https://www.thirdgen.org/forums/engi...bosch-3-a.html
They're not 24 lbs injectors, but IMO I think 24's are a bit much for a 305.
https://www.thirdgen.org/forums/engi...bosch-3-a.html
They're not 24 lbs injectors, but IMO I think 24's are a bit much for a 305.
Thread Starter
Joined: Feb 2003
Posts: 2,498
Likes: 20
From: PNW
Car: 91 Black Formula KR
Engine: 305 TPI R69/G92
Transmission: Astro A5-Pro 5.0-McCleod
Axle/Gears: US Gear 3.42 Eaton True Trac
Re: 305 upgrade cam, heads, base, etc... ???
Ok Orr89RocZ, you aren't getting off that easy 😉
Why the 268 over the 260?
Why the 268 over the 260?
Joined: Sep 2003
Posts: 25,895
Likes: 429
From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
Re: 305 upgrade cam, heads, base, etc... ???
I like more duration. 260 is more stock in duration with a very aggressive lobe. It would also run well but sound very tame imo. The 268 would help pull more power up top and sound abit more like a cam. Just my opinion
Senior Member
Joined: Nov 2004
Posts: 768
Likes: 32
From: Lansing, MI
Car: 1988 IROC-Z
Engine: 5.7 TPI
Transmission: 700R4
Axle/Gears: 3.45
Re: 305 upgrade cam, heads, base, etc... ???
I will be the one to say it. You will be disappointed.
The smaller bore of the 305 shrouds the intake valve and limits the airflow. As far as building a SBC, you have a good combo. What you are doing will require a custom PROM to run correctly. More than just a few changes. You will probably need to go through 3 or 4 edits to get it close.
My
because it is a 305 with 150,000 on it is to wait until you can afford the 383.
The smaller bore of the 305 shrouds the intake valve and limits the airflow. As far as building a SBC, you have a good combo. What you are doing will require a custom PROM to run correctly. More than just a few changes. You will probably need to go through 3 or 4 edits to get it close.
My
because it is a 305 with 150,000 on it is to wait until you can afford the 383. 
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