Results 1 to 14 of 14

98 Heads

This is a discussion on 98 Heads within the Internal Engine forums, part of the LSx Technical Help Section category; I know the 98 heads do not have the center bolts through heads. My question is what are those heads ...

  1. #1
    Junior Member n.m.racer's Avatar
    Join Date
    Feb 2008
    Location
    The Field, Ohio
    Posts
    41

    Pewter Metallic
    1999 Trans Am A4

    98 Heads

    I know the 98 heads do not have the center bolts through heads. My question is what are those heads casting numbers? Also was 98 the only year they were put on f-bodys? I have a 99 and I'm praying I dont have those heads.

    I forget my casting number 85-... and I think those are it. If I do have those heads, Is my block not capable of matching a set of 243's or something else from the later engines? Or is it posible to drill and tap the block where the head bolts go? Or are the designs for the bolts completely different?

  2. #2
    Member c5z28's Avatar
    Join Date
    Apr 2008
    Location
    Bay Area
    Posts
    8,120

    On your ass flashing
    my highbeams

    97-98 heads are 806
    99-00 853
    01-04 241

  3. #3
    cutting and welding mark21742's Avatar
    Join Date
    Mar 2008
    Location
    mercersburg pa
    Posts
    6,443

    hugger orange
    2004

    the head bolt patterns are the same, so you can bolt a newer set of heads right onto the block.
    if you do a swap you'll need the newer centerbolt valve covers and coil bracket

  4. #4
    Junior Member n.m.racer's Avatar
    Join Date
    Feb 2008
    Location
    The Field, Ohio
    Posts
    41

    Pewter Metallic
    1999 Trans Am A4

    Quote Originally Posted by mark21742 View Post
    the head bolt patterns are the same, so you can bolt a newer set of heads right onto the block.
    if you do a swap you'll need the newer centerbolt valve covers and coil bracket
    Can you tap into the block for the center head bolts?

  5. #5
    Member
    Join Date
    Jun 2009
    Location
    coon rapids, MN
    Age
    52
    Posts
    404

    red
    2000TA

    you do not need to tap into the heads for center bolt valve covers!

  6. #6
    Junior Member n.m.racer's Avatar
    Join Date
    Feb 2008
    Location
    The Field, Ohio
    Posts
    41

    Pewter Metallic
    1999 Trans Am A4

    Quote Originally Posted by garygnu65 View Post
    you do not need to tap into the heads for center bolt valve covers!
    haha not the valve covers but the heads themselves into the block

  7. #7
    Member 346ci's Avatar
    Join Date
    Sep 2007
    Location
    AK
    Age
    27
    Posts
    553

    NBM
    1998 Z-28

    Quote Originally Posted by c5z28 View Post
    97-98 heads are 806
    99-00 853
    01-04 241
    That's good info, thanks

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

    On your ass flashing
    my highbeams

    Quote Originally Posted by chuckie669 View Post
    Some of the 01 + came with 243's. Guy at the shop I visit has an 02 with 243 heads.
    You mean to tell me some 01-02 f-bodies recieved 243 heads
    time to bring the gang on in.

  9. #9
    Member c5z28's Avatar
    Join Date
    Apr 2008
    Location
    Bay Area
    Posts
    8,120

    On your ass flashing
    my highbeams

    Quote Originally Posted by n.m.racer View Post
    haha not the valve covers but the heads themselves into the block

    the only difference is the center bolt valve covers the head bolts are the same pattern-tapping into an aluminum block

  10. #10
    Impounded
    Join Date
    Oct 2007
    Location
    Beaver Dam KY
    Posts
    7,746

    79 T/A -91 Firebird
    1998 Trans Am -Oynx Black

    Heads swap from the 98 heads requires new valve covers and coil pack brackets.

    They are direct fit.

    243 heads didnt come on 02s. I do believe the pushrod length is different on them.

  11. #11
    Something Diabolical... chuckie669's Avatar
    Join Date
    May 2007
    Location
    Houston, Texas
    Posts
    2,677
    2000 C5 Torch Red

    I apologize for the misinformation. If your not supposed to trust everything you read on the internet and can't trust people you talk to? Who the F can you trust?

  12. #12
    Senior Member Too Fast's Avatar
    Join Date
    Nov 2006
    Location
    Indianapolis
    Age
    54
    Posts
    5,170

    Black
    2000 WS6 6spd Hooker LT

    Quote Originally Posted by c5z28 View Post
    97-98 heads are 806
    99-00 853
    01-04 241
    My 5/00 WS6 has the 241 heads. They must've changed late in the production year.

  13. #13
    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 JoshieDoom View Post
    Heads swap from the 98 heads requires new valve covers and coil pack brackets.

    They are direct fit.

    243 heads didnt come on 02s. I do believe the pushrod length is different on them.
    Correct
    As for the pushrod length it is based off the Base circle of the cam and has nothing to fo with the heads (unless they were milled).
    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

  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 Too Fast View Post
    My 5/00 WS6 has the 241 heads. They must've changed late in the production year.
    very late 00 recieved 241

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Replies: 0
    Last Post: 03-16-2011, 10:30 AM
  2. Replies: 0
    Last Post: 02-04-2011, 03:00 PM
  3. AFR heads VS. Ported and beefed up stock heads.
    By hutcher04 in forum Internal Engine
    Replies: 10
    Last Post: 03-14-2010, 09:27 AM
  4. New Heads or Port/Polish Stock Heads?
    By Black02LS1 in forum Internal Engine
    Replies: 32
    Last Post: 06-23-2007, 12:29 AM

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
  •