TPI Tuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
Sponsored by:
Sponsored by:

should i stick with l98 heads?

Thread Tools
 
Search this Thread
 
Old 04-06-2009, 01:46 PM
  #1  
Member
Thread Starter
 
leek157's Avatar
 
Join Date: Jul 2007
Location: Lisle Illinois
Posts: 149
Likes: 0
Received 0 Likes on 0 Posts
Car: 95 SHO. 87 IROC red 69 Vette blue
Engine: 3.0 Yamahammer.5.7 TPI L98, 350
Transmission: mtx4 ,700r4, 4speed,
Axle/Gears: 3.27, 3.73
should i stick with l98 heads?

Im debating on either taking my l98 heads to a machine shop or going with one of the cheaper aluminum aftermarket heads, Im trying to figure out which one would be more cost effective and have better results with my new setup, xfi268 cam and ported tpi until mid smmer, i dont know that much about heads so any help and recommendations would be awesome
Old 04-06-2009, 02:35 PM
  #2  
Senior Member
iTrader: (1)
 
NemeSS-TyranT's Avatar
 
Join Date: Jan 2009
Location: Houston TX
Posts: 959
Likes: 0
Received 0 Likes on 0 Posts
Car: 02 SS
Engine: 408 TT (1108rw-93/m1)6700rpm
Transmission: TH400(slipping)
Axle/Gears: 12bolt/3.42(whines😠)
Re: should i stick with l98 heads?

basic valvejob, with slight mill, and new springs. invest in a lt1/lt4 type hotcam. and spend on exhaust system and calibration. will make for nice street performer.
Old 04-06-2009, 02:44 PM
  #3  
Member

iTrader: (5)
 
Steve Mack's Avatar
 
Join Date: Aug 2006
Location: Stafford, Connecticut
Posts: 311
Likes: 0
Received 1 Like on 1 Post
Car: 87 Iroc
Engine: modified 350
Transmission: high performance built 700R4
Axle/Gears: Strange S60 3:73
Re: should i stick with l98 heads?

After market heads.
Old 04-06-2009, 11:12 PM
  #4  
Member
Thread Starter
 
leek157's Avatar
 
Join Date: Jul 2007
Location: Lisle Illinois
Posts: 149
Likes: 0
Received 0 Likes on 0 Posts
Car: 95 SHO. 87 IROC red 69 Vette blue
Engine: 3.0 Yamahammer.5.7 TPI L98, 350
Transmission: mtx4 ,700r4, 4speed,
Axle/Gears: 3.27, 3.73
Re: should i stick with l98 heads?

ya ive got a complete exhaust, the cam, ect, but what would a ballpark price range be for getting decent flow out of them
Old 04-07-2009, 12:51 AM
  #5  
Senior Member

 
Toyota h8r's Avatar
 
Join Date: Dec 2006
Location: toledo
Posts: 584
Likes: 0
Received 0 Likes on 0 Posts
Car: 1987 Z28
Engine: LG4
Transmission: T5
Axle/Gears: 3.23
Re: should i stick with l98 heads?

Originally Posted by Steve Mack
After market heads.
im going with this guy......l98 heads are junk flow wise

im going with a set of world product sportsman II heads or the cheap aluminum ones on ebay(procomp IIRC)

bigger valves and much more room in the intake runners
Old 04-07-2009, 12:12 PM
  #6  
Moderator

iTrader: (1)
 
Kevin91Z's Avatar
 
Join Date: Jul 1999
Location: Orange, SoCal
Posts: 10,943
Received 19 Likes on 17 Posts
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Re: should i stick with l98 heads?

Most aftermarket aluminum heads are better out of the box than the best set of ported stock heads. And for the price of fixing stock heads, you can get better heads.

And just be careful about buying cheap heads. You get what you pay for.
Old 04-07-2009, 12:37 PM
  #7  
Member
Thread Starter
 
leek157's Avatar
 
Join Date: Jul 2007
Location: Lisle Illinois
Posts: 149
Likes: 0
Received 0 Likes on 0 Posts
Car: 95 SHO. 87 IROC red 69 Vette blue
Engine: 3.0 Yamahammer.5.7 TPI L98, 350
Transmission: mtx4 ,700r4, 4speed,
Axle/Gears: 3.27, 3.73
Re: should i stick with l98 heads?

I was looking at some of the heads summit had for under $1000, has anyone heard anything bad about the summit heads?
Old 04-07-2009, 02:31 PM
  #8  
Junior Member
 
jwilliams417's Avatar
 
Join Date: Dec 2008
Posts: 7
Likes: 0
Received 0 Likes on 0 Posts
Re: should i stick with l98 heads?

Just make sure you check gasket sizes on the summit heads. I bought a set of Patriot 195cc freedom heads with the intention of using them with my TPI and that was a no go because of the 1206 gasket size of the heads and there isnt enough material on the tpi to port em out from 1205 -> 1206. Now Im forced to get a Stealth Ram rather than go through the hassle of sending them back and swapping heads again....oh well.
Old 04-07-2009, 11:12 PM
  #9  
Member
Thread Starter
 
leek157's Avatar
 
Join Date: Jul 2007
Location: Lisle Illinois
Posts: 149
Likes: 0
Received 0 Likes on 0 Posts
Car: 95 SHO. 87 IROC red 69 Vette blue
Engine: 3.0 Yamahammer.5.7 TPI L98, 350
Transmission: mtx4 ,700r4, 4speed,
Axle/Gears: 3.27, 3.73
Re: should i stick with l98 heads?

what about these http://store.summitracing.com/partde...5&autoview=sku or these http://store.summitracing.com/partde...5&autoview=sku would the D shaped exhaust ports work the hooker 2055's both of those heads have angled plugs too as opposed to the straight, i hope there wouldn't be any clearance issues
Old 04-07-2009, 11:38 PM
  #10  
Member
 
theboilermaker's Avatar
 
Join Date: Feb 2005
Location: Fort Wayne, Indiana
Posts: 156
Likes: 0
Received 0 Likes on 0 Posts
Car: 87 camaro sc
Engine: 357 w/ cc qjet
Transmission: 700 r4
Re: should i stick with l98 heads?

I am in the exact same situation. I just got the same cam with the matching springs and retainers etc from summit. Upon pulling the heads I found that the valve guides were toasted and the valve seats are pretty beat up. Rather than invest money into the 083 heads I am concidering the ProComp's. My budget is fairly tight, and 1000 for heads is out of the question. Whats the word on these procomps? (I'll try not to hyjack your thread to bad)
Old 04-08-2009, 12:35 AM
  #11  
Member
Thread Starter
 
leek157's Avatar
 
Join Date: Jul 2007
Location: Lisle Illinois
Posts: 149
Likes: 0
Received 0 Likes on 0 Posts
Car: 95 SHO. 87 IROC red 69 Vette blue
Engine: 3.0 Yamahammer.5.7 TPI L98, 350
Transmission: mtx4 ,700r4, 4speed,
Axle/Gears: 3.27, 3.73
Re: should i stick with l98 heads?

ya im also in a money time situation, i figured while i have the heads off i could get them machined and performing better than what they are right now for cheaper than new heads, it just seems like a waste putting the stock heads back on with the new cam and everything, it would be nice to get some better performing heads but i dont think im gona have the time/money to do it now
Old 04-08-2009, 10:31 AM
  #12  
Junior Member
 
jwilliams417's Avatar
 
Join Date: Dec 2008
Posts: 7
Likes: 0
Received 0 Likes on 0 Posts
Re: should i stick with l98 heads?

those heads you leaked will blow your budget. I doubt you noticed but the trick flow's you linked from summit were priced per head.. I was in the same situation and wanted a nice set of heads for under 1k. I went with the Patriot Freedom 195's...awesome head so far..just make sure you are aware of the 1206 gasket issues.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
lt500r55
Tech / General Engine
6
09-01-2021 01:30 PM
CRFred
Engine/Drivetrain/Suspension Parts for Sale
9
02-07-2016 11:39 PM
TheExaminer
Tech / General Engine
10
08-19-2015 10:07 PM
matthew911
Engine Swap
13
08-12-2015 09:38 AM
anesthes
Tech / General Engine
5
08-08-2015 09:37 PM



Quick Reply: should i stick with l98 heads?



All times are GMT -5. The time now is 01:55 AM.