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Flat top pistons...worth it?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 89GMCSuburban, Feb 1, 2002.

  1. 89GMCSuburban

    89GMCSuburban 1/2 ton status

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    Here are my options...
    $735 for a premium long block, 8.5:1 compression, cast dish pistons, 12/12,000 warranty
    $975 for a complete rebuild with 3 angle valve job and flat top hypereutectic pistons, about 9.4:1 compression, 6/6,000 mile warranty.
    Is it worth the extra money to get the flat top piston motor? How much more power can I expect? Would just getting the $735 motor and dumping a good cam in it give me the same power? What would you do in my shoes?

    Red 1989 GMC Suburban SLE V1500 - TBI 350, 700R4 w/ shift kit, Quad-shock front, 31/10.50/15 Pro Comp MT, 4.10 gears, Duals off cat
     
  2. beater74

    beater74 1/2 ton status

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    IMLAO, no, i have a fairly new engine and i got the flat top piston and i regret now because i am having a problem with spark knok. with the higher compression i MUST run 93 oct. gas or it will knok like a sonofabitch. i have had to run a fresh air intake put the timing at 4 deg. above tdc and run NKG spark plugs and i still have a little knok goin on. but thats just my 1/2 a cent

    gime a bucket of chicken with extra skin!
     
  3. Russell Keys

    Russell Keys 1/2 ton status

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    If you choose a long block... Shop around. A lot of companies can offer a cam upgrade and still get their warranty. I did this with Roadmaster a few years back. Have you checked into local machine shops? Sometimes they are competitive with rebuilder companies. Something else to think about...Order a short block and have work done to your heads and use them. That's where the power can be made.
     
  4. 89GMCSuburban

    89GMCSuburban 1/2 ton status

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    The $735 block can get a "torque" cam upgrade for $40. I'd like to get the specs on it. Most rebuilders are quoting me $900.

    Red 1989 GMC Suburban SLE V1500 - TBI 350, 700R4 w/ shift kit, Quad-shock front, 31/10.50/15 Pro Comp MT, 4.10 gears, Duals off cat
     

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