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discovered 241's on my 1998 z28

This is a discussion on discovered 241's on my 1998 z28 within the Camaro / SS forums, part of the Vehicle Specific category; Quick question, I bought a 1998 z28 and received a spread sheet from the previous owner. Every bolt that he ...

  1. #1

    discovered 241's on my 1998 z28

    Quick question, I bought a 1998 z28 and received a spread sheet from the previous owner. Every bolt that he turned is documented however in his notes I noticed "inspected heads, center bolt valve covers, 241 heads, not 1998 engine." Now correct me if I'm wrong but the previous owner assumed the engine was replaced because the heads are not original when in fact chances are only the heads were swapped. The computer is still a 1998 model if that means anything. Is this a good thing I have 241's? What are the original heads? Do you think I still have the original block?

  2. #2
    Senior Member kingls1's Avatar
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    discovered 241's on my 1998 z28

    98's came with 806 heads perimeter style bolt pattern. 241 heads have center bolt and flow a little better. better than them were the 243's. the only way to tell if block is original you need the number from the block.
    99 Trans Am, SLP Lid, Blackwing filter, smooth bellow, Ported TB, LS6 intake, Ws6 lower ram air box, OBX LT's, Magna Flow cat back, LS7 clutch, Tick MC, Hurst Shifter, Frost Tune, UMI SFC,LAC, STB, PB, Torq Arm, Super Hawk hood, Torq Thrust II, Kee Audio.
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  3. #3

    discovered 241's on my 1998 z28

    thanks

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    Member zmg00camaross's Avatar
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    May have been a late production engine going into 99.

  5. #5

    discovered 241's on my 1998 z28

    I guess it doesn't really matter how they got there, just wanted to confirm what I had when ordering parts. Going to bring it in to a gm dealership at some point hopefully they can clear everything up for me.

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    Spaz is My Mentor SMWS6TA's Avatar
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    98 T/A w/a little mods...

    How many owners of the car besides you 2?

    It's possible the heads were swapped out. Almost anything is better then the 806 heads.


    The only non performance difference with center bolt vs perimeter bolt is the valve covers. You can easily remove the coil packs as a unit instead of individual units.

  7. #7

    discovered 241's on my 1998 z28

    I am the third owner, 123,000 miles. Previous owner purchased it with 89,000 in 2010 and set it up for auto cross.

  8. #8

    discovered 241's on my 1998 z28

    I'm wondering if zmg is right.. when the second owner bought the car it was bone stock. I doubt the first owner would have swapped heads without any other mods

  9. #9
    Member zmg00camaross's Avatar
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    I bet it's factory just late 98 model year.

  10. #10
    Moderator Firebirdjones's Avatar
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    241's didn't come out until the 2001 model year, so that would be pretty darn late

    After 98 they came out with 851's, center bolt valve covers. Those heads stayed through 2000 production (my 2000 SS has them) then the switch to 241's was made late that year for the new 2001 models.

    241's are said to be better than previous versions because they went through a sand casting process (not all 241's, just the ones cast in Mexico) which provided a smoother surface and more uniform shape from port to port. This provided slightly better flow numbers. From what I've seen and read, it's not much more than 5 cfm. Nothing to get too excited about.
    Last edited by Firebirdjones; 03-13-2014 at 06:15 AM.

  11. #11

    discovered 241's on my 1998 z28

    So the motor was swapped at some point or I may have early 851's from the factory? Like I said when the previous owner got the car it still had the stock exhaust, lid, wheels ect.. That being said I can safely rule out the first owner swapping heads. I wish I could just drive down to the dealership but I travel for work, I've been on the road for a month straight and I don't know when I can get back home. I've been really curious ever since I left lol.

  12. #12
    Member zmg00camaross's Avatar
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    O yeah I forgot they came out in 01 I thought it was 99. My bad lol my 00 ss has 241.

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