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68 WT Build
’68 GTO with a numbers matching WT 400, 16 heads. Three speed Dearborn Trans, 3:55 axle,
Previous owner rebuilt the engine in 2001. Bored .030 over. Engine was operated for about 500 miles before it was pulled and stored. When I bought the car earlier this year I pulled the heads and oil pan. Found surface rust in the crankcase, scored bores, heavy carbon on the piston tops. I took it to a local well known machine shop (recommended by other Pontiac owners) for a teardown and inspection and they reported the following: The Bad Excessive wear on the rod bearings and crankshaft. (rod ends reportably to tight) Excessive wear on the cam bearings All cylinder bores scored Deck surface rough Valve guide inserts worn The Good Passed Mag inspection Line bore was good Machine work they recommend Bore .040 with Torque Plates Machine crankshaft to .020 New Bronze valve guides Light deck and head resurfacing Resize factory rods Balancing What I Want At least 325-350 flywheel HP and to operate on 91 octane with 10% ethanol. I’ve done some reading on similar engine builds and I think the following will work for me. Q-Jet Factory Intake Ram Air exhaust manifolds. Upgrade the camshaft to Melling SPC7 or Lunati Voodoo 10510702 New lifters, oil pump, pushrods, timing gears. From Spotts Performance KB pistons 17cc dish (KB346-040) with recommended rings 670 head kit . Seeing how I need to clean up the deck, would zero deck clearance be beneficial? Machine shop says they can keep the compression to about 9.5 with the combination of the dished pistons and the right type of head gasket. A stroker kit is tempting but due to budgetary concerns I’ll be using the original crank and rods. Engine had about 115k on it when it was rebuilt the first time so I’m thinking the original rods will be sufficient for the power levels I’m looking for. Thanks in advance for any advice.
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Ed 1968 GTO (Thanks Mom) 2006 Silverado 2007 Cadillac SRX 2015 Chevy Express 2024 Cadillac LYRIQ Last edited by OG68; 07-16-2019 at 12:20 PM. |
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