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327 = 383???

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  • #1

    327 = 383???

    I have nt posted in about 2 months because my t/a was in the shop with a terrible miss. Couldnt run in 6th gear at all and it was running real bad. Well thy replaced the water pump because it leaked down onto the opti or dist.( what ever it is replaced it) and replaced the plugs and plug wire and did a little tunning. And now she runs hard! Cant wait to take her to the track. One thing though, the speed shop told me that it wasnt the original 350 block. He said it was a 327 block? Can this be? A 327 turned into a 383? I wounder if I got taken by the previous owner?


    97 ws6 6sp 40k miles 355 cubes strange s 60 rear 373 gears. other stuff! 360rwhp

    current
    2006 GMC Denali 6.0 AWD!!!! hers
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  • #2
    They probably saw the "327" casting number on the side of the block and figured that was the displacement. Most Gen I engines have the displacement stamped on the side like this. However, the "327" stamp on the block designates an LT1. Your speed shop probablty doesnt do many LT1s.
    96 WS6 Formula: Ram Air, 383 Stroker, Ported LT4 Heads and Manifold, 1.6 Crane Rollers, 58MM T.B., AS&M Headers, Borla Exhaust, Meziere Elec. H2O Pump, Canton Deep Sump Oil Pan, 100 HP OF TNT N2O!! , T56 Conversion w/ Pro 5.0 shifter, SPEC Stage 3 Clutch, Hotchkiss Subframe Conn., Lakewood Adj. Panhard Bar, Spohn Adj. LCA's, BMR Adj. T.A., Custom 12 bolt w/ 3:73's, Moser Axles, Eaton Posi, Moser Girdle
    11.6 @ 123mph (1.6 60' - getting there )

    Comment

    • #3
      Heres a pic of the stamp im talking about......
      Attached Files
      96 WS6 Formula: Ram Air, 383 Stroker, Ported LT4 Heads and Manifold, 1.6 Crane Rollers, 58MM T.B., AS&M Headers, Borla Exhaust, Meziere Elec. H2O Pump, Canton Deep Sump Oil Pan, 100 HP OF TNT N2O!! , T56 Conversion w/ Pro 5.0 shifter, SPEC Stage 3 Clutch, Hotchkiss Subframe Conn., Lakewood Adj. Panhard Bar, Spohn Adj. LCA's, BMR Adj. T.A., Custom 12 bolt w/ 3:73's, Moser Axles, Eaton Posi, Moser Girdle
      11.6 @ 123mph (1.6 60' - getting there )

      Comment

      • #4
        Thanks N20LT4Bird. I hope that was it. Can a 327 be turned into a 383?


        97 ws6 6sp 40k miles 355 cubes strange s 60 rear 373 gears. other stuff! 360rwhp

        current
        2006 GMC Denali 6.0 AWD!!!! hers

        Comment

        • #5
          The full GM part number for the blocks used in the LT1 and LT4 Corvettes, F-Body's, Impala SS/Roadmaster/Fleetwood car was:

          10125327

          In all of the above cars, that block was used with a 4.000" bore, and a 3.480" stroke to yield a nominal 350 cubic inches. You can replace the stock crank with a 3.750" stroke crank, and bore the cylinders out to 4.030", and you will have a (nominal) 383 cubic inch engine. You could also use a 3.875" stroke crank with the 4.030" overbore for 396 cubic inches. Both of these "stroker" conversions are extremely common using the "327" block.

          There have also been some 4.000" (409 ci)and 4.125" (421 ci) stroke engines built on the "327" block, but the cost starts to grow exponentially with these combinations.

          There was also a "baby LT1" engine - 265 cubic inches - in the early Caprices, and it is a 10168588 casting that had the numbers "4.3" cast on the side.
          Fred

          381ci all-forged stroker - 10.8:1 - CNC LT4 heads/intake - CC solid roller - MoTeC engine management - 8 LS1 coils - 58mm TB - 78# injectors - 300-shot dry nitrous - TH400 - Gear Vendor O/D - Strange 12-bolt - 4.11's - AS&M headers - duals - Corbeau seat - AutoMeter gauges - roll bar - Spohn suspension - QA1 shocks - a few other odds 'n ends. 800HP/800lb-ft at the flywheel, on a 300-shot. 11.5 @ 117MPH straight motor

          Comment

          • #6
            Originally posted by thomas
            I hope that was it.
            I would bet a million on it. DO you have a cam driven water pump? No belt driving the pump right? Its an LT1 block.

            Originally posted by thomas
            Can a 327 be turned into a 383?
            I dont think so.
            96 WS6 Formula: Ram Air, 383 Stroker, Ported LT4 Heads and Manifold, 1.6 Crane Rollers, 58MM T.B., AS&M Headers, Borla Exhaust, Meziere Elec. H2O Pump, Canton Deep Sump Oil Pan, 100 HP OF TNT N2O!! , T56 Conversion w/ Pro 5.0 shifter, SPEC Stage 3 Clutch, Hotchkiss Subframe Conn., Lakewood Adj. Panhard Bar, Spohn Adj. LCA's, BMR Adj. T.A., Custom 12 bolt w/ 3:73's, Moser Axles, Eaton Posi, Moser Girdle
            11.6 @ 123mph (1.6 60' - getting there )

            Comment

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