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TBI Throttle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.

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Old 04-12-2010, 10:27 PM   #1
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Join Date: Mar 2010
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Car: 92 Pontiac Firebird
Engine: 305 TBI L03
Transmission: 700r4
Axle/Gears: 2.73 one wheel drive

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Rocker Arm questions.

Hi, i want to know if i can install a set of roller rockers on my stock 305 with l03 heads wich have the factory rockers wich arent rollers. Will 1.6 ratio not work, im kinda loss, dont know wich to buy and were, can any of u guys tell me if i can just install a set of roller rockers on my stock engine without having to modify anything else.
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Old 04-14-2010, 04:02 AM   #2
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Re: Rocker Arm questions.

Narrow body full roller rockers will fit with centerbolt valve covers, you may need to mesure if the pushroad lengt needs to be changed.
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Old 04-14-2010, 05:30 PM   #3
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Car: 92 Pontiac Firebird
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Re: Rocker Arm questions.

Thxs, but will i need to modify anything to install 1.6 rockers ? Since they increase valve lift and stock swirl ports i have heard have small valve lift capacity.
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Old 04-15-2010, 05:09 AM   #4
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Re: Rocker Arm questions.

The stock LO3 heads allow up to .470 in lift, safe. The LO3 cam with 1.6 rockers is in the .400 lift area.
I suggest you read the sticky treads, the search function is wery helpful too.
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91 350 .060 over, 9.8 CR, Scat rotating assembly, KB193 pistons, Floating pins, CCA 8-500-8 + roller lifters + Magnum pushroads + 981-16 valve springs, Cloyes 9-3157 timing chain, Sealed-Power A-Series aluminum bearings, Scorpion Performance 1.5 roller rockers, Summitracing 162108 aluminium heads, 47mm 3704, DIY cold air intake, RBob's EBL flash, ACD#EP241 TPI fuel pump, turbocity's 46mm TB +VRFPR, dctrumpet's #80 injectors @ 20psi VRFP, DIY 700r4 Pro Built RR, 3.5"aluminium driveshaft, Eaton LSD, GM 3.23, mac headers #TF8692, hoocker #16823 cat back, catco 3" cat, 3 wire heated O2 sensor, Bilsteins, ebmiller88's 1LE brakes
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Old 04-15-2010, 09:09 PM   #5
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Car: 89 RS, 92 Z28
Engine: 305 TBI, 350 TPI
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Re: Rocker Arm questions.

Quote:
Originally Posted by thomas1976 View Post
The stock LO3 heads allow up to .470 in lift, safe. The LO3 cam with 1.6 rockers is in the .400 lift area.
I suggest you read the sticky treads, the search function is wery helpful too.


Where is the sticky pertaining to the 1.6 rollers...i can not find it...Thank you, Tom
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Old 04-16-2010, 09:12 AM   #6
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Re: Rocker Arm questions.

http://www.thirdgen.org/techboard/tb...-synopsis.html (TBI: Condensed Performance Synopsis)

I posted cam specs with and without 1.6 rockers. I am personally running 1.6 Comp cam roller rockers on my car with no issues.
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Old 04-17-2010, 01:38 PM   #7
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Car: 89 RS, 92 Z28
Engine: 305 TBI, 350 TPI
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Re: Rocker Arm questions.

Quote:
Originally Posted by robertfrank View Post
http://www.thirdgen.org/techboard/tb...-synopsis.html (TBI: Condensed Performance Synopsis)

I posted cam specs with and without 1.6 rockers. I am personally running 1.6 Comp cam roller rockers on my car with no issues.

Thanks....I seem to have pushrod clearance problems where the pushrods go thru the holes in the head...Is this common on these motors??? Looks like I may have to grind a little bit on each hole...Tom
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Old 04-17-2010, 01:38 PM
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