Vortec heads for the 305?
Thread Starter
Senior Member
Joined: Jun 2000
Posts: 599
Likes: 0
From: Glenbeulah, WI
Car: 1988 Firbird
Engine: 406
Transmission: T-56
Axle/Gears: 4.10
Vortec heads for the 305?
I am in the process of choosing some new heads for my 305, what does anyone know about the vortec 305 heads? I was planning to run a set of 350 vortec heads that were milled .050 to keep the 58 CC combustion chamber of my 305 heads but maybe I can use the 305 heads. Do these heads flow well, and do thet offer me any performance advantage over my LB-9 heads?
Thanks
Thanks
Supreme Member
Joined: Dec 2001
Posts: 1,532
Likes: 0
From: Nebraska
here is the perf. numbers for a 350 with vortec heads. enjoy!
Originally posted by BigMike 92 Z28
You guys gotta go and get the new CHEVY HIGH PERFORMANCE magazine. on the cover it shows a pic of a TPI motor and says TPI Manifold For Vortec Heads.. Its a SCOGGIN DlCKEY Manifold. Great article. Its list price in the magizine is $399.95
POWER NUMBERS:
There were three test shown here by a dyno on a 1987 Third Generation Camaro with factoryspark curves and slightly larger 24lb/hr injectors.
Test 1:
Stock 5.7L L98 with Iron Vortec Heads and SCOGGIN DlCKEY'S TPI Vortec manifold. Power was rated at 294 bhp@4400 RPM and 395 lb/ft@3400 RPM.
Test 2:
Test two was the same motor with a ZZ4 Hydraulic-roller cam and LT4valve springs. Power was rated at 307bhp@4400 RPM and 399lb/ft@3400 RPM
Test 3:
Test three added a set of Edelbrock runners and throttle body along with GM performance parts HOT CAM and 1.6 roller rockers.
Power was rated at 347bhp@4400 RPM and 427lb/ft@3800 RPM.
These numbers are directly out of the magizine. There is a lot more info in this magizine including facts like it is smog legal if you hook up the SCOGGIN DlCKEY external gas pick up tube that directs the gas from the passanger side exaust header into the intake manifold. Doesent say anything about being legal in California but it it is I think Im going to put this combo togher with an ATI Pro Charger and reallly make some power.
You guys gotta go and get the new CHEVY HIGH PERFORMANCE magazine. on the cover it shows a pic of a TPI motor and says TPI Manifold For Vortec Heads.. Its a SCOGGIN DlCKEY Manifold. Great article. Its list price in the magizine is $399.95
POWER NUMBERS:
There were three test shown here by a dyno on a 1987 Third Generation Camaro with factoryspark curves and slightly larger 24lb/hr injectors.
Test 1:
Stock 5.7L L98 with Iron Vortec Heads and SCOGGIN DlCKEY'S TPI Vortec manifold. Power was rated at 294 bhp@4400 RPM and 395 lb/ft@3400 RPM.
Test 2:
Test two was the same motor with a ZZ4 Hydraulic-roller cam and LT4valve springs. Power was rated at 307bhp@4400 RPM and 399lb/ft@3400 RPM
Test 3:
Test three added a set of Edelbrock runners and throttle body along with GM performance parts HOT CAM and 1.6 roller rockers.
Power was rated at 347bhp@4400 RPM and 427lb/ft@3800 RPM.
These numbers are directly out of the magizine. There is a lot more info in this magizine including facts like it is smog legal if you hook up the SCOGGIN DlCKEY external gas pick up tube that directs the gas from the passanger side exaust header into the intake manifold. Doesent say anything about being legal in California but it it is I think Im going to put this combo togher with an ATI Pro Charger and reallly make some power.
Senior Member
Joined: Sep 1999
Posts: 764
Likes: 0
From: Emmaus, Pa
Car: 1987 Camaro IROC Z28
Engine: 355
Transmission: 1994 T56
Axle/Gears: BW 3.27 (stock)
the 305 vortec heads suck compared to the L31 heads, and although the L31s are rated as having a 64cc chamber, i've seen some data that says they are really more of a 61cc head if you were to test it out. So even without work, they are pretty 305 friendly.
Thread
Thread Starter
Forum
Replies
Last Post
84z96L31vortec
Tech / General Engine
7
Aug 20, 2017 12:16 AM
L98GTA87
Engine/Drivetrain/Suspension Wanted
1
Aug 11, 2015 06:55 PM
84z96L31vortec
North East Region
1
Aug 10, 2015 08:27 PM
