Page 1 of 2 12 LastLast
Results 1 to 20 of 24

Rectangular or Cathedral give me your .02

This is a discussion on Rectangular or Cathedral give me your .02 within the Internal Engine forums, part of the LSx Technical Help Section category; i need to replace the heads and will be doing a cam, need some dif opinions of what heads you ...

  1. #1
    Member 2000dreambird's Avatar
    Join Date
    Jun 2009
    Location
    Mass
    Posts
    618

    silver/black
    00 trans am,SLP,Ws6

    Rectangular or Cathedral give me your .02

    i need to replace the heads and will be doing a cam, need some dif opinions of what heads you think are better or worst and why...

  2. #2
    Firebird Encyclopedia 9T8W66's Avatar
    Join Date
    Oct 2006
    Location
    St. Clair Shores. Michigan
    Age
    49
    Posts
    1,605

    Navy Blue Metallic
    `98 Formula M6 HdTp

    For the money a stock set of rectangle ports (L92/LS3) are tough to beat but unfortunately they won't work on anything smaller then a 4.00" bore block (6.0).
    So unless your thinking about going with a larger shortblock stick with the Cathedral port heads.
    Craig
    Semi Retired Street Racer
    2012 Lava Red Mustang GT Coupe Brembo/3.73's
    Build Date 3/17/11, Last Lava Red GT

    Gone but not forgoten
    NBM `98 Formula M6 HdTp
    1 of 1 Build Date 3/12/98

  3. #3
    Member c5z28's Avatar
    Join Date
    Apr 2008
    Location
    Bay Area
    Posts
    8,120

    On your ass flashing
    my highbeams

    They make a set for the l92's to fit on our cars I have heard of. Wouldn't be cost effective like they are on the ls-2's

  4. #4
    🤔 11s. blackbirdbrain89's Avatar
    Join Date
    Sep 2007
    Location
    hagerstown, mercersburg
    Age
    28
    Posts
    1,844

    black trans am
    2000

    Quote Originally Posted by 2000dreambird View Post
    i need to replace the heads and will be doing a cam, need some dif opinions of what heads you think are better or worst and why...
    why do u need to take the heads off for a cam swap?

  5. #5
    Member 2000dreambird's Avatar
    Join Date
    Jun 2009
    Location
    Mass
    Posts
    618

    silver/black
    00 trans am,SLP,Ws6

    Quote Originally Posted by blackbirdbrain89 View Post
    why do u need to take the heads off for a cam swap?
    I schooled a kid in a BMW but when I got home I had a knocking noise in my top end. I think it's a lifter. So if I have to take the heads off I might aswell change them and if I'm going to change them I might aswell cam it too.

  6. #6
    Firebird Encyclopedia 9T8W66's Avatar
    Join Date
    Oct 2006
    Location
    St. Clair Shores. Michigan
    Age
    49
    Posts
    1,605

    Navy Blue Metallic
    `98 Formula M6 HdTp

    Quote Originally Posted by 2000dreambird View Post
    I schooled a kid in a BMW but when I got home I had a knocking noise in my top end. I think it's a lifter. So if I have to take the heads off I might aswell change them and if I'm going to change them I might aswell cam it too.
    I'd be willing to bet the noise is from bent pushrods (cheap fix). Do a search as this is a pretty common problem encountered on manual trans cars.
    It only takes one blown shift to bend a couple pushrods.

  7. #7
    Member 2000dreambird's Avatar
    Join Date
    Jun 2009
    Location
    Mass
    Posts
    618

    silver/black
    00 trans am,SLP,Ws6

    Quote Originally Posted by 9T8W66 View Post
    I'd be willing to bet the noise is from bent pushrods (cheap fix). Do a search as this is a pretty common problem encountered on manual trans cars.
    It only takes one blown shift to bend a couple pushrods.
    I already pulled them ut and checked them they all look good.

  8. #8
    ʢ ൧ ൨ ൩ ൪ ൫ ൬ ൭ ൮Ր Ց Ւ Փ Smittro's Avatar
    Join Date
    Feb 2009
    Location
    Pittsburgh
    Posts
    9,965

    White
    2008 Hummer H3

    Lightbulb

    Quote Originally Posted by blackbirdbrain89 View Post
    why do u need to take the heads off for a cam swap?
    Because unless you have a way of holding up the lifters you'll have to remove the heads to get them out on ls1..
    :\Users\Steven\Pictures\d6ftg5nh.gif


    Suggestion: If you are particularly irritated by another member's posting habits and are constantly fighting the urge to flame them, you can click on that person's profile, and select "Add to ignore list." This will make that person's posts invisible to you.

  9. #9
    Junior Member rooster18's Avatar
    Join Date
    May 2010
    Location
    Kiln, MS
    Posts
    3
    2007 Tundra

    Quote Originally Posted by Smittro View Post
    Because unless you have a way of holding up the lifters you'll have to remove the heads to get them out on ls1..
    lifters are simple to hold up without pulling the heads. simply spin the cam over by hand backwards and forwards and insert 2- 5/16" rods in the two holes behind the water pump when you get that far along and wa-lah. but if you're gonna wanna do heads anyway then go for it

  10. #10
    King 0f n00bz shady milkman's Avatar
    Join Date
    Jan 2006
    Location
    Shepherd, Michigan
    Age
    29
    Posts
    11,775

    blacker than wesleysnipes
    98' trans am

    by far the rectangular port heads are a better platform...however you are stuck with cathedral unless you want to spend stupid cash on a mast small bore rectangular head.

    if you got the cash..get a good set of 205 AFRs

  11. #11
    ʢ ൧ ൨ ൩ ൪ ൫ ൬ ൭ ൮Ր Ց Ւ Փ Smittro's Avatar
    Join Date
    Feb 2009
    Location
    Pittsburgh
    Posts
    9,965

    White
    2008 Hummer H3

    Thumbs up

    Quote Originally Posted by rooster18 View Post
    lifters are simple to hold up without pulling the heads. simply spin the cam over by hand backwards and forwards and insert 2- 5/16" rods in the two holes behind the water pump when you get that far along and wa-lah. but if you're gonna wanna do heads anyway then go for it
    Ah ha, I see..

  12. #12
    Member LSXZ28's Avatar
    Join Date
    Aug 2009
    Location
    On the dyno tuning in MD
    Posts
    162

    Black
    99 Silverado

    I would go with a Texas Speed Torquer V2 cam and 5.3L heads package... can't beat the bang for the buck there!

    GM EFI Tuner
    2002 Trans Am WS6 - 9.41@143mph, #3675, on pump gas and drag radials - sold

  13. #13
    Member El Toro Loco's Avatar
    Join Date
    Jun 2008
    Location
    Harlingen, tx
    Posts
    757

    pewter
    2001 Trans AM WS6

    In the GM high tech performance, where they showcased a black formula built by hawks third gen it states the placed some l92 heads on the ls1 how is that if theyare made for 6.0 n up engines I didn't understand that

  14. #14
    Member c5z28's Avatar
    Join Date
    Apr 2008
    Location
    Bay Area
    Posts
    8,120

    On your ass flashing
    my highbeams

    Quote Originally Posted by El Toro Loco View Post
    In the GM high tech performance, where they showcased a black formula built by hawks third gen it states the placed some l92 heads on the ls1 how is that if theyare made for 6.0 n up engines I didn't understand that
    It's a kit they make

  15. #15
    King 0f n00bz shady milkman's Avatar
    Join Date
    Jan 2006
    Location
    Shepherd, Michigan
    Age
    29
    Posts
    11,775

    blacker than wesleysnipes
    98' trans am

    Quote Originally Posted by El Toro Loco View Post
    In the GM high tech performance, where they showcased a black formula built by hawks third gen it states the placed some l92 heads on the ls1 how is that if theyare made for 6.0 n up engines I didn't understand that
    Along with what c5 said...you can run a gen iv head on a ls1...but it will suffer in terms of performance..as there will be shroading and the valves are quite large for a 346 and will require a split cam...so they say

  16. #16
    Junior Member
    Join Date
    Sep 2010
    Location
    texas
    Posts
    31

    black
    01 ss m6

    Quote Originally Posted by 2000dreambird View Post
    I schooled a kid in a BMW but when I got home I had a knocking noise in my top end. I think it's a lifter. So if I have to take the heads off I might aswell change them and if I'm going to change them I might aswell cam it too.
    good shit... my buddy had a bad ass knocking noise from somewhere under the hood in his 99 m6 ta... sounded like a couple rods knocking. so we got tired of hearing it and he got pissed. we did a 1st-4th WOT pull and it has never made any other noise than what a normal car should make.. fixed itself.. lmao. just saying.....

  17. #17
    Member 2000dreambird's Avatar
    Join Date
    Jun 2009
    Location
    Mass
    Posts
    618

    silver/black
    00 trans am,SLP,Ws6

    Quote Originally Posted by LSXZ28 View Post
    I would go with a Texas Speed Torquer V2 cam and 5.3L heads package... can't beat the bang for the buck there!
    This is one of the setups I'm interested in ..

  18. #18
    Member El Toro Loco's Avatar
    Join Date
    Jun 2008
    Location
    Harlingen, tx
    Posts
    757

    pewter
    2001 Trans AM WS6

    Quote Originally Posted by shady milkman View Post
    Along with what c5 said...you can run a gen iv head on a ls1...but it will suffer in terms of performance..as there will be shroading and the valves are quite large for a 346 and will require a split cam...so they say
    glad to clear that up i jus had remember reading that it could not be made to fit then i read that article and was like wtf i thought it couldnt be fit, they also supercharged that formula that was a sick 3rdgen

  19. #19
    blah '02 WS6's Avatar
    Join Date
    Sep 2006
    Location
    white deer, tx
    Age
    32
    Posts
    218

    black
    '02 trans am ws6

    The GMHTP article was using Gen IV L92 heads from Mast Motorsports and were made specifically for a stock bore LS1. Factory L92s are made for a 4.000" bore, not the LS1s 3.910. You cannot go buy some L92s off a wrecked Vette, G8, etc etc and slap 'em on an LS1.

    That said, just because rectangular is the new fad doesn't necessarily mean its the best option. Ask Pat G why he went with his cathedral Mamo'd AFRs over his worked L92s on his G8, and is almost 25-30rwhp higher than other H/C G8s that have worked and heavily worked L92s.

  20. #20
    King 0f n00bz shady milkman's Avatar
    Join Date
    Jan 2006
    Location
    Shepherd, Michigan
    Age
    29
    Posts
    11,775

    blacker than wesleysnipes
    98' trans am

    Quote Originally Posted by '02 WS6 View Post
    The GMHTP article was using Gen IV L92 heads from Mast Motorsports and were made specifically for a stock bore LS1. Factory L92s are made for a 4.000" bore, not the LS1s 3.910. You cannot go buy some L92s off a wrecked Vette, G8, etc etc and slap 'em on an LS1.

    That said, just because rectangular is the new fad doesn't necessarily mean its the best option. Ask Pat G why he went with his cathedral Mamo'd AFRs over his worked L92s on his G8, and is almost 25-30rwhp higher than other H/C G8s that have worked and heavily worked L92s.
    rectangular ports are still relatively new. The cathedral ports were the same for a good amount of time when they first came out...

Page 1 of 2 12 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. So best cathedral port head for 346-427?
    By BANDITO in forum Internal Engine
    Replies: 6
    Last Post: 02-10-2012, 03:24 AM
  2. Give me $15k+your LS1 powered ride I give you my
    By astroxy in forum Vehicles For Sale / Trade
    Replies: 5
    Last Post: 04-19-2010, 04:46 PM
  3. rectangular exhaust tips ??!!
    By PON-TON in forum General Help
    Replies: 20
    Last Post: 12-15-2009, 12:13 PM
  4. LCA's: Tubular vs Rectangular
    By rdx4me in forum Suspension and Handling
    Replies: 5
    Last Post: 05-30-2007, 05:36 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •