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305 upgrade cam, heads, base, etc... ???

Old 12-05-2018, 05:21 PM
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Join Date: Feb 2003
Location: Tampa Bay
Posts: 2,410
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
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Old 12-05-2018, 05:59 PM
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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.
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Old 12-05-2018, 06:05 PM
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Car: '88 GTA
Engine: 350 TPI
Transmission: 700R4
Axle/Gears: 3.27
Re: 305 upgrade cam, heads, base, etc... ???

Originally Posted by blacksunshine'91 View Post
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.
Not sure if he has more than one set but I bought those from him. I'd be willing to part with them for the same price though I decided to go with new from southbay.
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Old 12-05-2018, 07:03 PM
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Car: 89 Iroc-z
Engine: Twin Turbo 401
Transmission: TH400
Axle/Gears: 4th gen 12 bolt 3.42
Re: 305 upgrade cam, heads, base, etc... ???

Run the 268 xfi lol
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Old 12-06-2018, 05:54 AM
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Join Date: Feb 2003
Location: Tampa Bay
Posts: 2,410
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?


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Old 12-06-2018, 06:30 AM
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Car: 89 Iroc-z
Engine: Twin Turbo 401
Transmission: TH400
Axle/Gears: 4th gen 12 bolt 3.42
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
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Old 12-07-2018, 09:10 AM
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Location: Lansing, MI
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Car: 1988 IROC-Z
Engine: 5.7 TPI
Transmission: 700R4
Axle/Gears: 3.70
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.
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