Thread: 3.4 Upgrade??
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TurboKraft TurboKraft is offline
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Ha ha, Dirk -- exactly right! Once you get away from the little factory cam profiles, it is shocking that (a) the torque at 3,000rpm is night-and-day better, (b) the engine makes more power and carries to a higher rpms, and (c) the engine still idles just fine with strong manifold vacuum.

cdill --
No matter which direction you choose to take the rebuild, I'd always recommend installing ARP head studs, ARP rod bolts (if not changing the rods), upgraded valve springs, and coated engine bearings.

If you stay 3.3L, the 964 cams are good, but there are better. They frequently require machining the top of the piston for additional valve clearance, but this is quite easy to do.

I also agreed that if oil pressure is good, it's likely your crankshaft is good and reuseable, only basic refurbishing required.

If you stroke the engine, it will be a torque monster. Sure, 98mm cylinders would be sweet, and we've done several with slip-fit 100mm cylinders, but you won't be disappointed with a 97mm bore stroker.
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Old 04-22-2014, 11:45 AM
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