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Block question? Variants Vs Mains.

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  • Block question? Variants Vs Mains.

    Hello,

    Could someone educate me on our 4.3 blocks?
    I know our blocks come with "2 bolt variants" and "2 bolt mains". . .
    Can our blocks be upgraded to like a "4 bolt variant" similar to "4 bolt main"?

    Thanks in advance!
    ZavTy547

    ty 547, mccoy cam, lb4s w/big valves, garrett gt4088 dbb.turbo, 38mm ext gate, 60lb inj, alky, code 59, plx 02, custom dig.dash, 2 step, custom a/a, 3" dp/rpm catback, blt tranny w/2800 stall, dual fans, z51 brakes, magnesium.17" whls.
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