C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

'91 L98 Head Porting

Old 11-12-2018, 12:24 PM
  #21  
Chad Speier
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So here is my plans for the engine:
*-Port heads
*-2.00/1.570 LS 8mm
*-KMotion LS drop in kit
*-1.60 stainless steel rockers
*-Erson 226/234 cam w/.545 lift
*-Port upper and lower manifold, weld OEM lower
+-TPiS big runners
*-52mm throttle body
*-Headers
*-2xxx stall converter
Old 11-12-2018, 08:26 PM
  #22  
cv67
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St. Jude Donor '05

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Drop in kit is springs/retainers?
Like the small stem conversion, who can the guides be purchased through (2.02/1.6 for Dart)
Those heads and seats are horrible from the factory!
Old 11-12-2018, 08:47 PM
  #23  
Chad Speier
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Originally Posted by cuisinartvette
Drop in kit is springs/retainers?
Like the small stem conversion, who can the guides be purchased through (2.02/1.6 for Dart)
Those heads and seats are horrible from the factory!
PEP has any guide you need, but these I'm going to use a 8mm guide liner

Picture of the KMotion kit.


Old 11-13-2018, 11:30 AM
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confab
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Related:

Lot of good information and some dyno match ups for various TPI components here:

Just a lot of good, general background links and information too. It's a good read.



http://garage.grumpysperformance.com...ith-tpi.10494/

Last edited by confab; 11-13-2018 at 11:31 AM.
Old 11-13-2018, 06:34 PM
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I decided for what I want to do, the OEM manifold even with big tube runners, was going to be too much work.

Decided on a TPiS manifold.
Old 11-14-2018, 11:08 AM
  #26  
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Polished stainless rocker I'm using. Very nice quality vs price.


Old 11-15-2018, 04:04 PM
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Factory steel guides cut down to .500 OD and .315 guide liners installed.


Old 11-15-2018, 04:05 PM
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Multi-angle intake valve job and radius exhaust.


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Old 11-16-2018, 08:21 PM
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Heads are done. Flow data on 4.00 fixture. .100-.800 and no exhaust pipe.




Old 11-16-2018, 08:56 PM
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Absolutely beautiful.. What tools are you using?
Old 11-19-2018, 06:23 PM
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Heads fitted with LS hardware.
Old 11-20-2018, 05:03 PM
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Old 11-20-2018, 05:55 PM
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Very nice.. What tools are you using to finish that? Carbide cutters and sanding rolls?

I've got a plenum and some runner that I'm going to port match and smooth out, and I want it to look exactly like yours when it is done.
Old 11-20-2018, 05:59 PM
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I use a SE5 aluma burr on everything.
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Old 11-20-2018, 07:08 PM
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84 4+3
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Some damn good numbers. How is the velocity on those ports if you mind my asking?
Old 11-20-2018, 09:49 PM
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It's almost a shame to cover up something that pretty..
Old 11-21-2018, 04:27 PM
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To '91 L98 Head Porting

Old 11-21-2018, 11:30 PM
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Awesome.. It's beautiful.

You ever consider becoming a forum sponsor?

Lot of guys would pay for work like that..
Old 11-23-2018, 07:37 AM
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Very nice job, they look and flow great.
Old 11-23-2018, 08:20 PM
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I see a man sharing his passion. Mr. Speiers has all the work he can handle. Thank you.

Last edited by hogandtow; 11-23-2018 at 08:22 PM. Reason: Spelling

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