Katech cnc porting bundle for 243s
Racer
Joined: Jul 2010
Posts: 409
Likes: 87
From: Hutto, Texas
I second this, While I was looking at head options for my 383, I compared several sets of flow numbers, and the TEA stage 2 LS-6 porting had some of the best flow numbers I could find, especially on the exhaust side (something like 260 cfm @ .600 lift). everyone always seems to focus on the intake numbers, but if you can't get the exhaust out, you're losing power potential. in my opinion anyway.
Last edited by Raith; Jun 12, 2025 at 02:57 AM.
Le Mans Master
Joined: Feb 2021
Posts: 6,413
Likes: 4,245
From: Florida
2025 Corvette of the Year Finalist - Unmodified
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I second this, While I was looking at head options for my 383, I compared several sets of flow numbers, and the TEA stage 2 LS-6 porting had some of the best flow numbers I could find, especially on the exhaust side (something like 260 cfm @ .600 lift). everyone always seems to focus on the intake numbers, but if you can't get the exhaust out, you're losing power potential. in my opinion anyway.
Le Mans Master
Joined: Feb 2021
Posts: 6,413
Likes: 4,245
From: Florida
2025 Corvette of the Year Finalist - Unmodified
2024 C5 of the Year Winner- Unmodified
2022 C5 of the Year Finalist - Unmodified
Wow! That CNC is definitely better than anything else I’ve seen…
Thread Starter
Racer
Joined: Apr 2007
Posts: 448
Likes: 46
Yupper, especially on the exhaust side where more material was removed...
...anyway, I think a very good use of a set of factory 243s I had laying around.
I will do the cam and heads install in the next few weeks, and post back here the results.
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Le Mans Master
Joined: Feb 2021
Posts: 6,413
Likes: 4,245
From: Florida
2025 Corvette of the Year Finalist - Unmodified
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I know I would, lol…
Safety Car
Joined: Mar 2017
Posts: 3,755
Likes: 934
From: Orlando Florida
Safety Car
Joined: Mar 2017
Posts: 3,755
Likes: 934
From: Orlando Florida
Best of luck to you! I know how time can slip through one's fingers though -- I've been pulling my IPC for more than a week now...
Racer
Joined: Aug 2011
Posts: 413
Likes: 24
From: Bloomfield Hills Michigan
I had a set of 799's done @ Katech for the standard CNC package and they look fantastic!
They're local to me (i.e., Metro-Detroit area) so it was easy enough to just drop them off. I did have to remove valves and springs, etc., and re-assemble everything, but no big deal.
Jeff
They're local to me (i.e., Metro-Detroit area) so it was easy enough to just drop them off. I did have to remove valves and springs, etc., and re-assemble everything, but no big deal.
Jeff
Burning Brakes
Joined: Feb 2022
Posts: 882
Likes: 971
From: NW Burbs of Chi-Town
2025 C5 of the Year Finalist - Modified
I really hope the delay is not health related. I was originally on the fence as to where to send my 243 heads for thew CNC porting between TSP and Katech. One thing I noticed is that the cams Katech have on their website are higher lift than I was thinking for a street car and eventually went TSP not for that reason, but it made me pause to how everything needs to work together as a good combo parts.
Thread Starter
Racer
Joined: Apr 2007
Posts: 448
Likes: 46
I really hope the delay is not health related. I was originally on the fence as to where to send my 243 heads for thew CNC porting between TSP and Katech. One thing I noticed is that the cams Katech have on their website are higher lift than I was thinking for a street car and eventually went TSP not for that reason, but it made me pause to how everything needs to work together as a good combo parts.
All good... and all done... started on the 2nd crank.
Install was straight forward, I followed the LS1howto.com instruction document.
Initial thoughts:
- The Texas Speed cam lobes are definitely not as chatty as classic Comp Cams XE-R lobes.
- The Melling oil pump (10295) added a solid 10-12 psi oil pressure.
- The Melling timing chain dampener (BD417-DBRKT), comes with no instructions. There are videos on youtube.
- The job can be done by yourself on jack stands, but you are going to be up and down a lot.
- It is labor intensive. I also did... new... rockers, main-front-pulley, lifters, lifter trays, oil-pump, timing chain, main and AC pulleys and belts
- I could NOT use the old crank bolt to pull the new pulley onto the crank snout. I used the below.
- Cars of this age... the plastic connectors are very brittle and are easily broken. Try to be careful.
- The factory ZO6 cam had some pitting on one of the lobes
-
