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  1. #1

    Default Got a bad 4.3 motor... What to do?

    It had a knock. Not sure what though.. The previous owner started to take it apart but never really got anywhere.

    I'd like to know if I go with another 4.3 what years motors I could use in my 99. Can I use a motor out of a S10/Blazer or are they different?

    I've also been thinking about putting in a LS1 and 6spd man. from a Camero/Firebird. What years would I have to use?
    99 Reg cab Silverado, 2wd, 5spd, 4.3 V6(bad motor)

  2. #2

    Default

    Quote Originally Posted by 99Silverado2wd View Post
    I'd like to know if I go with another 4.3 what years motors I could use in my 99. Can I use a motor out of a S10/Blazer or are they different?
    The S-10 and Astro van 4.3L are the same. Stick w/ the 90's or newer blocks as the earliest ones did not have balance shafts...the 4.3 is a 350 w/ two cyl deleted and the pre-balance shaft engines ran rough.
    Still Loyal to GM after all these years...:shocked:
    2006 Impala LT 3.5L
    2005 Silverado WT small cab/longbed 4x4 4.3L V6
    1999 Grand Am 3.4L in TX w/ our youngest
    1993 GMC Jimmy 4.3L 4 door 4x4 'Ole Rusty' - 'SOLD'
    1988 S-10 small cab/longbed HT3.4L Crate Engine
    1970 Nova 250 I-6, factory 3 sp floor shifter.
    1968 Chevelle 'Nomad' Wagon 250 I-6 w/ 3 on da' tree.

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