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I think the pick-up books higher because of the current trend to crew cabs. One truck is not necessarily better than the other otherwise. The 454 is a well established engine, quite durable and possibly cheaper to replace if it comes to that.
The leaky main on the GM is alarming unless they are noted for that and it is an easy fix and not related to overall engine wear.
The coil packs probably means a sparkplug change is due unless you already did that at 100K as spec'd. I have seen recommendations to change at 60k to reduce this. The gap has increased so much at 100k that the required voltage to fire the plugs has built up to where the pack insulation can break down. FYI, all spark plugs fire at the least voltage they can, and that variable is determined by the plug gap along with the resulting psi of compression. As an example, at idle all engines are compressing a near vacuum (easy to fire) and at wide open, low lugging speeds, all engine are compressing a full atmospheric charge of air (may miss). High speed, wide open again compresses less air because of difficulty in cylinder filling, and a miss may disappear. The result is that old point ignitions sometimes failed to build enough voltage to ever fire the spark whereas modern EPA ignitions build to horrendous levels, if they must, to prevent miss-fire. They are capable of fatally high voltages (to themselves) which is why it is not recommended to let a modern plug wire dangle with no easy place to fire.
So one truck needs a main seal and one perhaps needs plugs. You must realise that the Ford engine, as durable as they are, do sometimes blow out new plugs because the aluminum head design has very few, rather fragile, threads. Plug replacement must be done perfect and no Ford dealer I know will even guarantee success. There are several kits out there, a cottage industry, to repair aluminum threads for this engine and some others. And I am sure several on here will say they had no trouble. The local Ford dealer did my V-10 Excursion for the previous owner and it did blow at least one plug for me ($800) after several thousand more miles. I say at least one plug because I noted an odd coil pack at this time, and another damaged CP. Part of the $800 replaced all three coil packs with Ford OEM.
The 2500 Burb is becoming rarer since they no longer make them. The CC truck is becoming more common as new CC's are quite popular and somewhat displacing SUV's. Down the road there is a distinct possibilty that the 2500 will be worth more if HD SUV's retain any desirability at all.
Food for thought.
Wes
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