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Thread: Overbore to .040

  1. #21
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    Re: Overbore to .040

    Well now you have a purpose in life, to find the "perfect" block... now if you were a factory race team they'd probably let you have the pick of 50, but it's gonna be work pulling even half a dozen and hoping you find one better.
    DD1: '02 T&C Ltd, 3.8 AWD. DD2: '15 Versa Note SV, replacing.. DDx: '14 Versa Note SV << freshly killded :( ....... Projects: '88 Voyager 3.0, Auto with shift kit, timing advance, walker sound FX muffler on 15" pumpers wrapped in 215/65/R15 H rated Nexens.... and a '95 phord escort wagon PnP head << Both may need to go :( ..... I like 3.0s ... so??? ... stop looking at me like I've got two heads!

  2. #22
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    Re: Overbore to .040

    Quote Originally Posted by shackwrrr View Post
    Its not that .040 isn't recommended, the block is just thin, yours might be thicker. Crank spins clockwise looking at pullies, as the rods push the crank forward and pistons back therefore thrust is on the rear.
    Edited my post after thinking for a second... Thrust side is always to the right when looking from the flywheel end (crank spinning counter clockwise)

  3. #23
    Garrett booster
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    Re: Overbore to .040

    Thanks for the feedback everyone. I guess my biggest concern is that I'd be spending close to $2000 rebuilding a very worn block and am stuck with .040 slugs should something happen. Just seems like a large investment for something that could inevitably be replaced by something in better shape (i.e. a fresher block that doesn't require the max overbore)

    Not to mention the crank needs to be cut .030/.030.

    Just doesn't seem like a cost effective build.

    The hunt for a decent CB ensues.

  4. #24
    Buy my stuff!!!!!!!!!!! :O) Turbo Mopar Vendor turbovanmanČ's Avatar
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    Re: Overbore to .040

    Quote Originally Posted by Gaboon View Post
    Personally I wouldn't worry about it. My block is .040 over, I run upwards of 30 psi (on race gas)with a big turbo and have no issues what so ever. I might also add that I run a fairly decent shot of NOS on top of that. I do however run forged pistons and H beam rods along with a forged crank and ARP fasteners. This is a non lightened 87 SC (2640 lbs) and will run 129 mph through the traps so its making some decent power. but here's the the thing,this is an early T1 block....(actually the original block) you know the ones that everyone said could only take a max of about 250 hp
    Shadow is making over 500 whp on his early T1 block too,
    1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
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  5. #25
    Moderator Turbo Mopar Staff Force Fed Mopar's Avatar
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    Re: Overbore to .040

    The crank in my T2 was cut .030/.030
    Rob M.
    '89 Turbo GTC

    2.5 TIII stroker, 568 w/ OBX and 3.77 FD

  6. #26
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    Re: Overbore to .040

    Can you guys help me verify what block this is. Dude said it's from a '90 Lebaron Turbo (GTC?)







    It looks like a CB, but I can't tell for sure. Thoughts?
    Last edited by anokabball24; 07-27-2012 at 10:26 AM.

  7. #27
    Moderator Turbo Mopar Staff Force Fed Mopar's Avatar
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    Re: Overbore to .040

    Looks like it has the fuel pump hole in the side still and the block date is 8/29/88, makes it a late '88 non-common block.
    Rob M.
    '89 Turbo GTC

    2.5 TIII stroker, 568 w/ OBX and 3.77 FD

  8. #28
    Buy my stuff!!!!!!!!!!! :O) Turbo Mopar Vendor turbovanmanČ's Avatar
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    Re: Overbore to .040

    Square or round tooth timing belt? Round tooth is CB, square tooth is 98% non CB.
    1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
    1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
    2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
    2004 GSW TDI, 5 speed, fully loaded, modified.

    Aurora ignition wires for sale. Link to info

    Super60 roller cams or custom/billet cams. Link to info

  9. #29
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    Re: Overbore to .040

    Keep it coming fellas. I asked the guy if it's round or square tooth.

  10. #30
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    Quote Originally Posted by Force Fed Mopar View Post
    Looks like it has the fuel pump hole in the side still and the block date is 8/29/88, makes it a late '88 non-common block.
    That's the water pump hole. Rear pan rail is strait and no fuel pump hole makes it early common block.

    If the crank is good, I would build up the 2.5
    Ian Adams Function>Form 1990 shadow scrapped, too rusty:( 1991 Spirit R/T Scrapped, parts sold:( 1989 Turbo Caravan Daily beater with built-[I]ish [/I]​engine slowly evolving into weekend turbo beater.

  11. #31
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    Re: Overbore to .040

    Don't the balance shafts automatically make this a common block?

  12. #32
    Moderator Turbo Mopar Staff Force Fed Mopar's Avatar
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    Re: Overbore to .040

    Quote Originally Posted by shackwrrr View Post
    That's the water pump hole. Rear pan rail is strait and no fuel pump hole makes it early common block.

    If the crank is good, I would build up the 2.5
    Ahh yeah I see that now. Also has the large front seal housing.
    Rob M.
    '89 Turbo GTC

    2.5 TIII stroker, 568 w/ OBX and 3.77 FD

  13. #33
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    Re: Overbore to .040

    Appreciate the feedback guys. Looks like I may have found the ticket.

  14. #34
    Buy my stuff!!!!!!!!!!! :O) Turbo Mopar Vendor turbovanmanČ's Avatar
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    Re: Overbore to .040

    Quote Originally Posted by RJ138 View Post
    Don't the balance shafts automatically make this a common block?
    No, 2.5 tall decks had balance shafts, but the late casting, bs's AND if the crank gear is round tooth, its a CB.
    Pictures didn't show up for me yesterday.

    L
    1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
    1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
    2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
    2004 GSW TDI, 5 speed, fully loaded, modified.

    Aurora ignition wires for sale. Link to info

    Super60 roller cams or custom/billet cams. Link to info

  15. #35
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    Re: Overbore to .040

    I got my lancer 40 over now was 30 plus im running 30psi and getting ready to drop 75 shot on her

  16. #36
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    Re: Overbore to .040

    Quote Originally Posted by bakes View Post
    I got my lancer 40 over now was 30 plus im running 30psi and getting ready to drop 75 shot on her
    Bitchin. WHP/TQ?

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