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After a recent cam install with headers and catback exhaust (running stock heads), I made 433 rwhp @6400 rpm and 395 ft-lbs of torque @ 4800 rpm with a stock torque converter.
It's a big cam 228/232, 0.6in lift, LSA 112 so it was pretty much a dog at anything less than 3000 rpm with a stock converter.
Without changing anything in my setup, I swapped the stock converter for a ProTorque 2800 stall. At the dyno, I made 411 rwhp but 447 ft-lbs of torque. It really woke the car up on the street despite the dyno numbers. I haven't taken it to the strip yet but other nearly identical GTO's running drag radials are laying down 11.5's @ 118 mph.
In this instance, dyno numbers don't tell the whole story. The same would be true for your 300C.
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'05 Pontiac GTO (daily driver)
mods:
Hellraiser TQ camshaft
Kooks LT headers
Magnaflow Catback exhaust
Meziere electric water pump
FAST LSX intake manifold
90 mm ported throttle body
Volant cold air induction
ProTorque 2800 stall torque converter
drag bags
Nitto drag radials (for the strip)
Best ET & trap:
11.82 @ 117 mph
Coming up on October 6th: Dart 225 heads ported and prepped by Flow Tech Industries, SLP underdrive Pulley, Carolina Auto Masters Dyno Tune.
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