Auto Parts: engine swap, ford bronco, cylinder banks


Question
I have a 1990 Ford Bronco with a 302. I want to know if i can drop a 351 WHO in it straight or do i have to make any modifications and if I do have to modify what does that entail?

Answer
    If you get a complete engine, then the job will be pretty simple.  By complete, I mean that it includes the distributor, oil pan, intake manifold, timing cover, water pump, and any brackets required to mount the accessory drives to the front of the engine.  The principal difference between the 302 and the 351W is that the 351 has a taller deck (the distance between the crankshaft centerline and surface of the block to which the head is clamped).  Because of this taller deck, given the ninety degree angle between the cylinder banks, the engine is wider.  So, the intake manifold has to be wider to fit on the heads, and the exhaust pipes have to accommodate the extra width.  The exhaust is easy to deal with, so if you obtain a complete engine, the only other thing you have to deal with is the engine mounts.  Both engines use the same mount, so it's possible that you might have to get different frame mounts to accommodate the large engine.  Or, you might not, you'll have to check with the dealer.  Additionally there may be some wiring issues, depending on where the new engine came from.  If you find yourself having to replace the distributor, make sure that you do not get one intended for a 351C.  The Cleveland engine uses a very similar distributor with the same length shaft, but the gear is larger and will jam itself in and break if you try to use it on a 351W.  If you obtain a 351W complete with fuel injection, try to get the computer from the same truck, it will make things simpler with the new engine if you use the right computer instead of trying to modify the programming in the old one.