Weiand 174 on a 350hp stock bottom or 475hp 347 in a 3600lb F150 C4 trans ?

Honestly, if I was going boost with a blower - neither.

At 12psi you’re able to add probably 80% more power with a turbo. It’s more efficient and can generate less intake heat.

10.8 compression is quite a bit to start adding boost with this type of power adder.

If you are insisting on using the Weiand 174, I’d go with the 5.0. It will be happy down low and into the midrange, but will be inefficient and cause added unwanted heat.

if you’re ok being N/A I’d stick with the 347 and enjoy it.

if it were me, I’d sell the 5.0, sell the Weiand and buy an intercooled turbo system for low boost on the 347.

Pros:
You have a 5.0 that’s worth something
You have a Weiand assembly worth something
You have a solid 347 to run N/A for now
Turbos are abundant and can be reasonably priced
You have the ability to drive with the 347 for the summer and not have downtime

Cons:
I assume the suspension is still stock, and could use some help even with the N/A 347
Even if you blower up the 5.0, I’d assume realistically the suspension still isn’t up to the task
If you sell the 5.0 engine and Weiand blower, you’d most likely be a little bit out of pocket for a single turbo w/ intercooler package
The biggest con of all……. If both blocks are of original Ford stock, this could be the weak point if you wanted to lay down serious power.

Marty White said:

The 347 would be Na and the stock bottom 5.0 would be the boosted one. Just trying to weigh out the pros and cons to decide which route to go

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