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help picking out a block

This is a discussion on help picking out a block within the Internal Engine forums, part of the LSx Technical Help Section category; so yea im looking at building a 500 rwhp 383 stroker for my 94 z. I want to build from ...

  1. #1
    Senior Member ztrouble's Avatar
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    83 mustang 347

    help picking out a block

    so yea im looking at building a 500 rwhp 383 stroker for my 94 z. I want to build from the ground up so i will be using none of the stock lt1 parts. This is my first build so i need to know what block i should use. oh and i will eventually be going forced induction so i want a cast iron block

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    Pathelogical Liar BlackLT1Z28's Avatar
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    94 Camaro Z28

    You could machine the block you have now and start there. Or you could pull an LT1/LT4 out of a corvette and use that because they came with 4 bolt mains instead of 2.
    But if you want a frest block, there are plenty of companies that sell them. There are also cast iron LS1 blocks and complete stroker motors that can be built to your specifications.

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    Senior Member ztrouble's Avatar
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    83 mustang 347

    would this be one that may fit my needs? already set up to take the rotating assembly?

    http://store.summitracing.com/partde...5&autoview=sku

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    1999 Camaro SS

    Yes, this is a 4 bolt main block, but it appears that machining work still neds to be done. I built a 395 cu.in. stroker moter for my '87 Camaro Irocz from the ZZ4 block. BTW: I just turned a 12.12 sec ET with this car.
    The block that you picked is at 4.000" bore, a 383 cu.in stroker has a bore of 4.030" and a stroke of 3.750". I think that block is very expensive for a starting point.
    Also, this block may be an L98 type block which is good, its not an LT1 block, possibly. I think your should go with an L98 block with 4 bolt mains.
    '99 Camaro SS; 6-spd, LS2 402 stroker short block, PP stage 3 heads, GMS MAF, 244/248 cam, FLP headers, Borla catback, 4.10 gears, LS6 intake, 39#/hr injectors, Pro 5.0 shifter, subframe connectors, Comp Cams 1.85 rr,
    Best ET: 12.23sec (2.000sec 60'), trap spd:117.5mph, with the LS1 engine.

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    1999 Camaro SS

    I think your first decision is wheather to stick with the LT type block (Gen II) or get an earlier L98 type block. The LT blocks have no distributor in the rear of the block, its got the Omni-spark thing, and its the "reverse flow" technology. I dont like either of these features.

    If you stick with the LT series of blocks, get an LT4 block having 4 bolt mains.

  6. #6
    Senior Member ztrouble's Avatar
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    i already know i am not going with the lt block.... i havent had to deal with the opti yet and don't want to, I have a guy that does work on alot of my buddie's pro street cars... do you think i should go ahead and start with a 4bolt 350 block? i can get those for $500-$800, but i dont know abou the strength of those blocks i do know that i am going to go ahead and sleeve the block and fully forged internals due to the fact taht in a year or so i am going to put a twin screw on it

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    1999 Camaro SS

    Yes, start with a 4 bolt L98 350 single piece rear main seal block, designed for hydraulic roller lifters. At Summit Racing, there is such a block, the part number ends in 123, for about $650.

    Have it bored & honed out to 4.030", and have it decked to 9.010" or whatever gets it to clean up square. Then buy your favorite 383 rotating assembly and get it internally balanced. The crank must be forged. If you are 110% sure that you are going to add a power adder, then get pistons that give you the most desireable CR for your application.

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    Senior Member ztrouble's Avatar
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    thanks for the help

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