Go Back   LS1TECH > SBC-BBC-LT1-LT4 PERFORMANCE > Small Block & Big Block Chevy Specific
Sign in using an external account
Register Forgot Password?
Search

Small Block & Big Block Chevy Specific Mouse & Rat Motor Discussion & Conversions

Reply
 
Thread Tools Search this Thread
Old 05-30-2008, 11:58 PM   #1
TECH Enthusiast
Garage is empty, add now
 
F-Body Lover's Avatar
 
Trader Rating: 0
Join Date: Dec 2005
Posts: 576
Default Vortec heads VS L98 Aluminum heads

whats the specs on both stock? which one is better? I found a complete L98 TPI taken from 'vette for 800$ it has Aluminum heads and I was thinking of swapping the heads with my current L98 TPI Camaro and convert it to carb with a set of Hedman LT,March pulleys,3.73s,tranny cooler with custom fan and timing gear what do you think? I might add CC 306 cam with dual springs and rockers
__________________
F-Body Lover is offline   Reply With Quote
Old 05-31-2008, 11:11 AM   #2
TECH Senior Member
Garage is empty, add now
 
Trader Rating: 4
Join Date: Oct 2002
Location: OH
Posts: 5,034
Default

That TPI has no benefit over your current TPI. Those heads are some of the worst flowing heads GM ever built (but better than the "swirl port" TBI heads). Those heads have thin decks and are known to be crack prone over 450 hp. Also, you typically can't cut them for dual springs, you'll usually wind up hitting a water jacket.

I know all of this because I looked them up and I do own a set. You can run a K-Motion K-750 spring (130 on seat, 380 lbs open) on those heads (and I am currently doing so). I'm making about 400 FWHP with them, but I'd make a good bit more with other heads. $800 gets you pretty close to a set of edelbrocks (or anything else, all of which are an improvement over those heads).

The Vortec heads flow better and cost less. I'd use those first if I were doing it again.
trackbird is offline   Reply With Quote
Old 05-31-2008, 12:53 PM   #3
Staging Lane
Garage is empty, add now
 
Kevin91Z's Avatar
 
Trader Rating: 1
Join Date: Feb 2008
Location: Brea, CA
Posts: 59
Send a message via ICQ to Kevin91Z Send a message via AIM to Kevin91Z
Default

I used the L98 aluminum heads in my first engine. I wouldnt recommend them anymore for performance engines, only for street engines. Go with the Vortecs, they're a much better design.
__________________
1991 Camaro Z28
350 L98 w/ T56
364 RWHP, 387 RWTQ (08/09)
12.80 @ 108.50 (04/01)
Work: Manley Performance Products
Kevin91Z is offline   Reply With Quote
Old 05-31-2008, 01:53 PM   #4
In-Zane Moderator
Garage is empty, add now
 
ZONES89RS's Avatar
 
Trader Rating: 22
Join Date: Jan 2007
Location: Conroe, Texas
Posts: 10,126
Default

^^^ Word. Those old heads dont hold anything to the outdated cammel humps, much less the vortec.
__________________

BUILT NOT BOUGHT
80 Coupe 6.0 TH400
86 TA 5.3, 4L80
92 S10 ECSB 4.8 T56
Quote:
Originally Posted by -Ross- View Post
Haw mut horzpowa sbc or lsx eenjun mayk b4 eet need tarbo liked da 2jz?
ZONES89RS is offline   Reply With Quote
Old 05-31-2008, 04:12 PM   #5
9 Second Club
Garage is empty, add now
 
camarols1's Avatar
 
Trader Rating: 17
Join Date: Oct 2006
Location: NW Chicago Suburbs
Posts: 685
Default

+1

The Vortec head design outflows the old alum. vette heads by a very large margin.
I built a hot-cammed Vortec 355 at the same time a friend of mine build his with the same Vette heads you have..
The only difference between the two engines was the heads, compression was identical.

I tuned both setups and mine was significantly stronger throughout the powerband.
__________________
79 Camaro 6.0 twin s366's
best so far - 9.125@148.35mph - getting there.....
http://youtu.be/xlaD35oRQtU?list=UUF...p3ArhB91JKqcWQ
camarols1 is offline   Reply With Quote
Old 05-31-2008, 08:13 PM   #6
12 Second Club
1998 Pontiac Trans Am
 
Trader Rating: 0
Join Date: May 2005
Posts: 41
Default

I made 350rwhp on the motor through an auto with a 4000 stall useing stock vortec heads. They even out flow the bowtie heads out of the box, plus with the acc. bolted on you can't really tell them from your stockers.
__________________

Lethal Performance : Mechanic / Fabricator
1992 C1500 - 4.3 (under drives, B&M Holeshoot, Stage II trans, no cat, Flowmaster, NEEDS GEARS) Sold
1998 Formula : Mystic Teal (LT's with a 3" X-pipe, LS6 intake, ported throttle body, lid, K&N, a 3600 stall, 3.73 gears) 336RWHP 329RWTQ w/unlocked stall 1.72 60ft.12.33@110 on Nittos And yes...Still more mods to come.
frated420 is offline   Reply With Quote
Old 05-31-2008, 08:33 PM   #7
TECH Enthusiast
Garage is empty, add now
 
F-Body Lover's Avatar
 
Trader Rating: 0
Join Date: Dec 2005
Posts: 576
Default

Thats some good infos Thank you guys
__________________
F-Body Lover is offline   Reply With Quote
Old 06-09-2008, 12:05 AM   #8
TECH Resident
1999 Chevrolet Camaro
 
moge11's Avatar
 
Trader Rating: 0
Join Date: Oct 2005
Location: Champaign IL
Posts: 815
Default

Quote:
Originally Posted by frated420 View Post
I made 350rwhp on the motor through an auto with a 4000 stall useing stock vortec heads. They even out flow the bowtie heads out of the box, plus with the acc. bolted on you can't really tell them from your stockers.
Cam specs???? and what did it run?
__________________
99 NBM Z-28/1SZ M6_ SLP lid_ 8.37@85.26mph 1.95 sixty

1989 Yamaha YZ 80
moge11 is offline   Reply With Quote
Old 06-09-2008, 12:05 AM
LS1Tech
Pontiac Firebird




Paid Advertisement
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
best carb and intake for l98 lab_brown Small Block & Big Block Chevy Specific 0 11-15-2012 06:41 PM
tpi head vs lt1 head 93z28de LT1-LT4 Modifications 15 10-12-2012 09:17 AM
Any L98 TPI Experts? COD02SS Small Block & Big Block Chevy Specific 17 12-17-2007 07:40 AM
Junkyard heads fastlt1 Small Block & Big Block Chevy Specific 26 02-24-2007 08:15 AM
L98 TPI injector size? RiceHater Pontiac Firebird 1967-2002 2 04-29-2005 09:16 AM


Tags
aluminum, camaro, chevy, difference, engine, head, heads, k750, kmotion, l98, tbi, tpi, verses, vortec, weight


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off



Join Ls1Tech

All times are GMT -5. The time now is 02:29 PM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Service - Privacy Statement - JOBS
Emails & Contact Details