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Old 10-03-2021, 08:26 PM
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NeighborsComplaint NeighborsComplaint is offline
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Join Date: Aug 2009
Location: Elgin
Posts: 2,039
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Yeah, the spreadbores are a different casting and 4150 parts won't interchange. The center casting is also stretched to accomodate the secondaries.

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Triple Black 1971 GTO. 455 + .040", Block zero decked and align honed. SD Forged rods, forged SpeedPro pistons, crankshaft oil holes chamfered, polished and balanced. 6x-8 heads with 1.77" exhaust valves, bowls blended, port matched and smoothed. Crane 284281 (234/242 @ .050 duration w. .488/.505 lift), Crane Hi-Intensity lifters, Crane 99838 springs & retainers. ProComp RPM clone w. 750 Quick Fuel Slayer, FlowTech headers, TH400 w. Hughes GM25 convertor, 3.55 BOP 10 bolt.